Re: Build regressions/improvements in v5.16-rc1

Re: Build regressions/improvements in v5.16-rc1

[Geert Uytterhoeven]

On Mon, Nov 15, 2021 at 4:54 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> Below is the list of build error/warning regressions/improvements in
> v5.16-rc1[1] compared to v5.15[2].
>
> Summarized:
>   - build errors: +20/-13
>   - build warnings: +3/-28
>
> Happy fixing! ;-)
>
> Thanks to the linux-next team for providing the build service.
>
> [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/fa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf/ (all 90 configs)
> [2] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/8bb7eca972ad531c9b149c0a51ab43a417385813/ (all 90 configs)
>
>
> *** ERRORS ***
>
> 20 error regressions:
>   + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: expected ':' before '__stringify':  => 33:4, 18:4
>   + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: label 'l_yes' defined but not used [-Werror=unused-label]:  => 38:1, 23:1

    due to static_branch_likely() in crypto/api.c

parisc-allmodconfig

>   + /kisskb/src/drivers/gpu/drm/msm/msm_drv.h: error: "COND" redefined [-Werror]:  => 531
>   + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3252 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 47:1
>   + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3360 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 499:1
>   + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5344 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 334:1
>   + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5380 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 354:1
>   + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 1824 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 372:1
>   + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 2224 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 204:1
>   + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 3800 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 476:1

parisc-allmodconfig

>   + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2240 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>   + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2304 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>   + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2320 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1

powerpc-allmodconfig

>   + /kisskb/src/include/linux/compiler_types.h: error: call to '__compiletime_assert_366' declared with attribute error: FIELD_PREP: value too large for the field:  => 335:38

    in drivers/pinctrl/pinctrl-apple-gpio.c

arm64-allmodconfig (gcc8)

>   + /kisskb/src/include/linux/fortify-string.h: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter):  => 263:25, 277:17

    in lib/test_kasan.c

s390-all{mod,yes}config
arm64-allmodconfig (gcc11)

>   + error: modpost: "mips_cm_is64" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>   + error: modpost: "mips_cm_lock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>   + error: modpost: "mips_cm_unlock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>   + error: modpost: "mips_cpc_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>   + error: modpost: "mips_gcr_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A

mips-allmodconfig

> 3 warning regressions:
>   + <stdin>: warning: #warning syscall futex_waitv not implemented [-Wcpp]:  => 1559:2

powerpc, m68k, mips, s390, parisc (and probably more)

>   + arch/m68k/configs/multi_defconfig: warning: symbol value 'm' invalid for MCTP:  => 322
>   + arch/m68k/configs/sun3_defconfig: warning: symbol value 'm' invalid for MCTP:  => 295

Yeah, that happens when symbols are changed from tristate to bool...
Will be fixed in 5.17-rc1, with the next defconfig refresh.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: Build regressions/improvements in v5.16-rc1

[Marco Elver]

On Mon, Nov 15, 2021 at 05:12PM +0100, Geert Uytterhoeven wrote:
[...]
> >   + /kisskb/src/include/linux/fortify-string.h: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter):  => 263:25, 277:17
> 
>     in lib/test_kasan.c
> 
> s390-all{mod,yes}config
> arm64-allmodconfig (gcc11)

Kees, wasn't that what [1] was meant to fix?
[1] https://lkml.kernel.org/r/20211006181544.1670992-1-keescook@chromium.org

Thanks,
-- Marco

Re: Build regressions/improvements in v5.16-rc1

[Kees Cook]

On Mon, Nov 15, 2021 at 05:44:33PM +0100, Marco Elver wrote:
> On Mon, Nov 15, 2021 at 05:12PM +0100, Geert Uytterhoeven wrote:
> [...]
> > >   + /kisskb/src/include/linux/fortify-string.h: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter):  => 263:25, 277:17
> > 
> >     in lib/test_kasan.c
> > 
> > s390-all{mod,yes}config
> > arm64-allmodconfig (gcc11)
> 
> Kees, wasn't that what [1] was meant to fix?
> [1] https://lkml.kernel.org/r/20211006181544.1670992-1-keescook@chromium.org

[1] fixed the ones I found when scanning for __write_overflow(). [2]
fixed some others, so it's possible there are yet more to fix?

Taking a look at Linus's tree, though, the "263" and "277" lines don't
line up correctly. I'll go see if I can reproduce this. Is this with
W=1?

-Kees

[2] https://www.ozlabs.org/~akpm/mmotm/broken-out/kasan-test-consolidate-workarounds-for-unwanted-__alloc_size-protection.patch


-- 
Kees Cook

Re: Build regressions/improvements in v5.16-rc1

[Kees Cook]

On Mon, Nov 15, 2021 at 05:44:33PM +0100, Marco Elver wrote:
> On Mon, Nov 15, 2021 at 05:12PM +0100, Geert Uytterhoeven wrote:
> [...]
> > >   + /kisskb/src/include/linux/fortify-string.h: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter):  => 263:25, 277:17
> > 
> >     in lib/test_kasan.c
> > 
> > s390-all{mod,yes}config
> > arm64-allmodconfig (gcc11)
> 
> Kees, wasn't that what [1] was meant to fix?
> [1] https://lkml.kernel.org/r/20211006181544.1670992-1-keescook@chromium.org

Ah, I found it:

http://kisskb.ellerman.id.au/kisskb/buildresult/14660585/log/

it's actually:

    inlined from 'kasan_memcmp' at /kisskb/src/lib/test_kasan.c:897:2:

and

    inlined from 'kasan_memchr' at /kisskb/src/lib/test_kasan.c:872:2:

I can send a patch doing the same as what [1] does for these cases too.

-- 
Kees Cook

Re: Build regressions/improvements in v5.16-rc1

[Helge Deller]

On 11/15/21 17:12, Geert Uytterhoeven wrote:
> On Mon, Nov 15, 2021 at 4:54 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>> Below is the list of build error/warning regressions/improvements in
>> v5.16-rc1[1] compared to v5.15[2].
>>
>> Summarized:
>>   - build errors: +20/-13
>>   - build warnings: +3/-28
>>
>> Happy fixing! ;-)
>>
>> Thanks to the linux-next team for providing the build service.
>>
>> [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/fa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf/ (all 90 configs)
>> [2] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/8bb7eca972ad531c9b149c0a51ab43a417385813/ (all 90 configs)
>>
>>
>> *** ERRORS ***
>>
>> 20 error regressions:
>>   + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: expected ':' before '__stringify':  => 33:4, 18:4
>>   + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: label 'l_yes' defined but not used [-Werror=unused-label]:  => 38:1, 23:1
>
>     due to static_branch_likely() in crypto/api.c
>
> parisc-allmodconfig

fixed now in the parisc for-next git tree.


>>   + /kisskb/src/drivers/gpu/drm/msm/msm_drv.h: error: "COND" redefined [-Werror]:  => 531
>>   + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3252 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 47:1
>>   + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3360 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 499:1
>>   + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5344 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 334:1
>>   + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5380 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 354:1
>>   + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 1824 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 372:1
>>   + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 2224 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 204:1
>>   + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 3800 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 476:1
>
> parisc-allmodconfig

parisc needs much bigger frame sizes, so I'm not astonished here.
During the v5.15 cycl I increased it to 1536 (from 1280), so I'm simply tempted to
increase it this time to 4096, unless someone has a better idea....

>>   + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2240 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>>   + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2304 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>>   + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2320 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>
> powerpc-allmodconfig
>
>>   + /kisskb/src/include/linux/compiler_types.h: error: call to '__compiletime_assert_366' declared with attribute error: FIELD_PREP: value too large for the field:  => 335:38
>
>     in drivers/pinctrl/pinctrl-apple-gpio.c
>
> arm64-allmodconfig (gcc8)
>
>>   + /kisskb/src/include/linux/fortify-string.h: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter):  => 263:25, 277:17
>
>     in lib/test_kasan.c
>
> s390-all{mod,yes}config
> arm64-allmodconfig (gcc11)
>
>>   + error: modpost: "mips_cm_is64" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>   + error: modpost: "mips_cm_lock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>   + error: modpost: "mips_cm_unlock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>   + error: modpost: "mips_cpc_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>   + error: modpost: "mips_gcr_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>
> mips-allmodconfig
>
>> 3 warning regressions:
>>   + <stdin>: warning: #warning syscall futex_waitv not implemented [-Wcpp]:  => 1559:2
>
> powerpc, m68k, mips, s390, parisc (and probably more)

Will someone update all of them at once?




Helge


>>   + arch/m68k/configs/multi_defconfig: warning: symbol value 'm' invalid for MCTP:  => 322
>>   + arch/m68k/configs/sun3_defconfig: warning: symbol value 'm' invalid for MCTP:  => 295
>
> Yeah, that happens when symbols are changed from tristate to bool...
> Will be fixed in 5.17-rc1, with the next defconfig refresh.
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
>

Re: Build regressions/improvements in v5.16-rc1

[Nick Terrell]

> On Nov 15, 2021, at 8:44 AM, Helge Deller <deller@gmx.de> wrote:
> 
> On 11/15/21 17:12, Geert Uytterhoeven wrote:
>> On Mon, Nov 15, 2021 at 4:54 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>>> Below is the list of build error/warning regressions/improvements in
>>> v5.16-rc1[1] compared to v5.15[2].
>>> 
>>> Summarized:
>>>  - build errors: +20/-13
>>>  - build warnings: +3/-28
>>> 
>>> Happy fixing! ;-)
>>> 
>>> Thanks to the linux-next team for providing the build service.
>>> 
>>> [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/fa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf/  (all 90 configs)
>>> [2] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/8bb7eca972ad531c9b149c0a51ab43a417385813/  (all 90 configs)
>>> 
>>> 
>>> *** ERRORS ***
>>> 
>>> 20 error regressions:
>>>  + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: expected ':' before '__stringify':  => 33:4, 18:4
>>>  + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: label 'l_yes' defined but not used [-Werror=unused-label]:  => 38:1, 23:1
>> 
>>    due to static_branch_likely() in crypto/api.c
>> 
>> parisc-allmodconfig
> 
> fixed now in the parisc for-next git tree.
> 
> 
>>>  + /kisskb/src/drivers/gpu/drm/msm/msm_drv.h: error: "COND" redefined [-Werror]:  => 531
>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3252 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 47:1
>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3360 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 499:1
>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5344 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 334:1
>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5380 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 354:1
>>>  + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 1824 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 372:1
>>>  + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 2224 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 204:1
>>>  + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 3800 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 476:1
>> 
>> parisc-allmodconfig
> 
> parisc needs much bigger frame sizes, so I'm not astonished here.
> During the v5.15 cycl I increased it to 1536 (from 1280), so I'm simply tempted to
> increase it this time to 4096, unless someone has a better idea....

I am working on a patch set to reduce the frame allocations some, but it doesn’t
get every function below 1536 on parisc with UBSAN. But, in addition to parisc
needing bigger frame sizes, it seems the gcc-8-hppa-linux-gnu compiler is doing a
horrendously bad job, especially with -fsanitize=shift enabled.

As an example, one of the functions warned ZSTD_fillDoubleHashTable() [0] takes
3252 bytes of stack with -fsanitize=shift enabled (as shown in the first warning on line
47 above). It is a trivial function, and there is no reason it should take any more than
a few bytes of stack allocation. On x86-64 it takes 48 bytes with -fsanitize=shift. On
gcc-10-hppa-linux-gnu this function only takes 380 bytes of stack space with
-fsanitize=shift. So it seems like whatever issue is present in gcc-8 they fixed in gcc-10.

On gcc-10-hppa-linux-gnu, after my patch set, I don’t see any -Wframe-larger-than=1536
errors. So, you could either increase it to 4096 bytes, or switch to gcc-10 for the parisc
test.

I’ll reply in more detail later today when I put up my patch set to reduce the stack usage.

Best,
Nick Terrell

[0] https://github.com/torvalds/linux/blob/8ab774587903771821b59471cc723bba6d893942/lib/zstd/compress/zstd_double_fast.c#L15-L47

>>>  + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2240 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>>>  + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2304 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>>>  + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2320 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>> 
>> powerpc-allmodconfig
>> 
>>>  + /kisskb/src/include/linux/compiler_types.h: error: call to '__compiletime_assert_366' declared with attribute error: FIELD_PREP: value too large for the field:  => 335:38
>> 
>>    in drivers/pinctrl/pinctrl-apple-gpio.c
>> 
>> arm64-allmodconfig (gcc8)
>> 
>>>  + /kisskb/src/include/linux/fortify-string.h: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter):  => 263:25, 277:17
>> 
>>    in lib/test_kasan.c
>> 
>> s390-all{mod,yes}config
>> arm64-allmodconfig (gcc11)
>> 
>>>  + error: modpost: "mips_cm_is64" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>>  + error: modpost: "mips_cm_lock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>>  + error: modpost: "mips_cm_unlock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>>  + error: modpost: "mips_cpc_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>>  + error: modpost: "mips_gcr_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>> 
>> mips-allmodconfig
>> 
>>> 3 warning regressions:
>>>  + <stdin>: warning: #warning syscall futex_waitv not implemented [-Wcpp]:  => 1559:2
>> 
>> powerpc, m68k, mips, s390, parisc (and probably more)
> 
> Will someone update all of them at once?
> 
> 
> 
> 
> Helge
> 
> 
>>>  + arch/m68k/configs/multi_defconfig: warning: symbol value 'm' invalid for MCTP:  => 322
>>>  + arch/m68k/configs/sun3_defconfig: warning: symbol value 'm' invalid for MCTP:  => 295
>> 
>> Yeah, that happens when symbols are changed from tristate to bool...
>> Will be fixed in 5.17-rc1, with the next defconfig refresh.
>> 
>> Gr{oetje,eeting}s,
>> 
>>                        Geert
>> 
>> --
>> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>> 
>> In personal conversations with technical people, I call myself a hacker. But
>> when I'm talking to journalists I just say "programmer" or something like that.
>>                                -- Linus Torvalds
>> 
> 

Re: Build regressions/improvements in v5.16-rc1

[Nick Terrell]

> On Nov 16, 2021, at 1:08 PM, Nick Terrell <terrelln@fb.com> wrote:
> 
> 
> 
>> On Nov 15, 2021, at 8:44 AM, Helge Deller <deller@gmx.de> wrote:
>> 
>> On 11/15/21 17:12, Geert Uytterhoeven wrote:
>>> On Mon, Nov 15, 2021 at 4:54 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>>>> Below is the list of build error/warning regressions/improvements in
>>>> v5.16-rc1[1] compared to v5.15[2].
>>>> 
>>>> Summarized:
>>>> - build errors: +20/-13
>>>> - build warnings: +3/-28
>>>> 
>>>> Happy fixing! ;-)
>>>> 
>>>> Thanks to the linux-next team for providing the build service.
>>>> 
>>>> [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/fa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf/  (all 90 configs)
>>>> [2] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/8bb7eca972ad531c9b149c0a51ab43a417385813/  (all 90 configs)
>>>> 
>>>> 
>>>> *** ERRORS ***
>>>> 
>>>> 20 error regressions:
>>>> + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: expected ':' before '__stringify':  => 33:4, 18:4
>>>> + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: label 'l_yes' defined but not used [-Werror=unused-label]:  => 38:1, 23:1
>>> 
>>>   due to static_branch_likely() in crypto/api.c
>>> 
>>> parisc-allmodconfig
>> 
>> fixed now in the parisc for-next git tree.
>> 
>> 
>>>> + /kisskb/src/drivers/gpu/drm/msm/msm_drv.h: error: "COND" redefined [-Werror]:  => 531
>>>> + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3252 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 47:1
>>>> + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3360 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 499:1
>>>> + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5344 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 334:1
>>>> + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5380 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 354:1
>>>> + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 1824 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 372:1
>>>> + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 2224 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 204:1
>>>> + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 3800 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 476:1
>>> 
>>> parisc-allmodconfig
>> 
>> parisc needs much bigger frame sizes, so I'm not astonished here.
>> During the v5.15 cycl I increased it to 1536 (from 1280), so I'm simply tempted to
>> increase it this time to 4096, unless someone has a better idea....
> 
> I am working on a patch set to reduce the frame allocations some, but it doesn’t
> get every function below 1536 on parisc with UBSAN. But, in addition to parisc
> needing bigger frame sizes, it seems the gcc-8-hppa-linux-gnu compiler is doing a
> horrendously bad job, especially with -fsanitize=shift enabled.
> 
> As an example, one of the functions warned ZSTD_fillDoubleHashTable() [0] takes
> 3252 bytes of stack with -fsanitize=shift enabled (as shown in the first warning on line
> 47 above). It is a trivial function, and there is no reason it should take any more than
> a few bytes of stack allocation. On x86-64 it takes 48 bytes with -fsanitize=shift. On
> gcc-10-hppa-linux-gnu this function only takes 380 bytes of stack space with
> -fsanitize=shift. So it seems like whatever issue is present in gcc-8 they fixed in gcc-10.
> 
> On gcc-10-hppa-linux-gnu, after my patch set, I don’t see any -Wframe-larger-than=1536
> errors. So, you could either increase it to 4096 bytes, or switch to gcc-10 for the parisc
> test.
> 
> I’ll reply in more detail later today when I put up my patch set to reduce the stack usage.

Zstd has been compiled with -O3 since before this update, and I’ve left it in. However, if
I remove -O3 (which reverts to the default of -O2), the stack space reductions disappear
on parisc. So it seems like gcc-hppa-linux-gnu doesn’t handle -O3 well.

I’ve done some preliminary performance measurements, and -O3 doesn’t seem to be
necessary good performance anymore. So I should be able to remove it. I’ll measure a
bit more carefully, then put a patch up.

> Best,
> Nick Terrell
> 
> [0] https://github.com/torvalds/linux/blob/8ab774587903771821b59471cc723bba6d893942/lib/zstd/compress/zstd_double_fast.c#L15-L47
> 
>>>> + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2240 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>>>> + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2304 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>>>> + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2320 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>>> 
>>> powerpc-allmodconfig
>>> 
>>>> + /kisskb/src/include/linux/compiler_types.h: error: call to '__compiletime_assert_366' declared with attribute error: FIELD_PREP: value too large for the field:  => 335:38
>>> 
>>>   in drivers/pinctrl/pinctrl-apple-gpio.c
>>> 
>>> arm64-allmodconfig (gcc8)
>>> 
>>>> + /kisskb/src/include/linux/fortify-string.h: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter):  => 263:25, 277:17
>>> 
>>>   in lib/test_kasan.c
>>> 
>>> s390-all{mod,yes}config
>>> arm64-allmodconfig (gcc11)
>>> 
>>>> + error: modpost: "mips_cm_is64" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>>> + error: modpost: "mips_cm_lock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>>> + error: modpost: "mips_cm_unlock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>>> + error: modpost: "mips_cpc_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>>> + error: modpost: "mips_gcr_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>> 
>>> mips-allmodconfig
>>> 
>>>> 3 warning regressions:
>>>> + <stdin>: warning: #warning syscall futex_waitv not implemented [-Wcpp]:  => 1559:2
>>> 
>>> powerpc, m68k, mips, s390, parisc (and probably more)
>> 
>> Will someone update all of them at once?
>> 
>> 
>> 
>> 
>> Helge
>> 
>> 
>>>> + arch/m68k/configs/multi_defconfig: warning: symbol value 'm' invalid for MCTP:  => 322
>>>> + arch/m68k/configs/sun3_defconfig: warning: symbol value 'm' invalid for MCTP:  => 295
>>> 
>>> Yeah, that happens when symbols are changed from tristate to bool...
>>> Will be fixed in 5.17-rc1, with the next defconfig refresh.
>>> 
>>> Gr{oetje,eeting}s,
>>> 
>>>                       Geert
>>> 
>>> --
>>> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>>> 
>>> In personal conversations with technical people, I call myself a hacker. But
>>> when I'm talking to journalists I just say "programmer" or something like that.
>>>                               -- Linus Torvalds

Re: Build regressions/improvements in v5.16-rc1

[Nick Terrell]

> On Nov 15, 2021, at 8:44 AM, Helge Deller <deller@gmx.de> wrote:
> 
> On 11/15/21 17:12, Geert Uytterhoeven wrote:
>> On Mon, Nov 15, 2021 at 4:54 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>>> Below is the list of build error/warning regressions/improvements in
>>> v5.16-rc1[1] compared to v5.15[2].
>>> 
>>> Summarized:
>>>  - build errors: +20/-13
>>>  - build warnings: +3/-28
>>> 
>>> Happy fixing! ;-)
>>> 
>>> Thanks to the linux-next team for providing the build service.
>>> 
>>> [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/fa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf/  (all 90 configs)
>>> [2] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/8bb7eca972ad531c9b149c0a51ab43a417385813/  (all 90 configs)
>>> 
>>> 
>>> *** ERRORS ***
>>> 
>>> 20 error regressions:
>>>  + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: expected ':' before '__stringify':  => 33:4, 18:4
>>>  + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: label 'l_yes' defined but not used [-Werror=unused-label]:  => 38:1, 23:1
>> 
>>    due to static_branch_likely() in crypto/api.c
>> 
>> parisc-allmodconfig
> 
> fixed now in the parisc for-next git tree.
> 
> 
>>>  + /kisskb/src/drivers/gpu/drm/msm/msm_drv.h: error: "COND" redefined [-Werror]:  => 531
>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3252 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 47:1
>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3360 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 499:1
>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5344 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 334:1
>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5380 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 354:1
>>>  + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 1824 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 372:1
>>>  + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 2224 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 204:1
>>>  + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 3800 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 476:1
>> 
>> parisc-allmodconfig
> 
> parisc needs much bigger frame sizes, so I'm not astonished here.
> During the v5.15 cycl I increased it to 1536 (from 1280), so I'm simply tempted to
> increase it this time to 4096, unless someone has a better idea....

This patch set should fix the zstd stack size warnings [0]. I’ve
verified the fix using the same tooling: gcc-8-hppa-linux-gnu.

I’ll send the PR to Linus tomorrow. I’ve been informed that it
isn't strictly necessary to send the patches to the mailing list
for bug fixes, but its already done, so I’ll wait and see if there
is any feedback.

Best,
Nick Terrell

[0] https://lkml.org/lkml/2021/11/16/1217

>>>  + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2240 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>>>  + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2304 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>>>  + /kisskb/src/fs/ntfs/aops.c: error: the frame size of 2320 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]:  => 1311:1
>> 
>> powerpc-allmodconfig
>> 
>>>  + /kisskb/src/include/linux/compiler_types.h: error: call to '__compiletime_assert_366' declared with attribute error: FIELD_PREP: value too large for the field:  => 335:38
>> 
>>    in drivers/pinctrl/pinctrl-apple-gpio.c
>> 
>> arm64-allmodconfig (gcc8)
>> 
>>>  + /kisskb/src/include/linux/fortify-string.h: error: call to '__read_overflow' declared with attribute error: detected read beyond size of object (1st parameter):  => 263:25, 277:17
>> 
>>    in lib/test_kasan.c
>> 
>> s390-all{mod,yes}config
>> arm64-allmodconfig (gcc11)
>> 
>>>  + error: modpost: "mips_cm_is64" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>>  + error: modpost: "mips_cm_lock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>>  + error: modpost: "mips_cm_unlock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>>  + error: modpost: "mips_cpc_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>>>  + error: modpost: "mips_gcr_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
>> 
>> mips-allmodconfig
>> 
>>> 3 warning regressions:
>>>  + <stdin>: warning: #warning syscall futex_waitv not implemented [-Wcpp]:  => 1559:2
>> 
>> powerpc, m68k, mips, s390, parisc (and probably more)
> 
> Will someone update all of them at once?
> 
> 
> 
> 
> Helge
> 
> 
>>>  + arch/m68k/configs/multi_defconfig: warning: symbol value 'm' invalid for MCTP:  => 322
>>>  + arch/m68k/configs/sun3_defconfig: warning: symbol value 'm' invalid for MCTP:  => 295
>> 
>> Yeah, that happens when symbols are changed from tristate to bool...
>> Will be fixed in 5.17-rc1, with the next defconfig refresh.
>> 
>> Gr{oetje,eeting}s,
>> 
>>                        Geert
>> 
>> --
>> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>> 
>> In personal conversations with technical people, I call myself a hacker. But
>> when I'm talking to journalists I just say "programmer" or something like that.
>>                                -- Linus Torvalds
>> 
> 

Re: Build regressions/improvements in v5.16-rc1

[Randy Dunlap]

On 11/16/21 5:59 PM, Nick Terrell wrote:
> 
> 
>> On Nov 15, 2021, at 8:44 AM, Helge Deller <deller@gmx.de> wrote:
>>
>> On 11/15/21 17:12, Geert Uytterhoeven wrote:
>>> On Mon, Nov 15, 2021 at 4:54 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>>>> Below is the list of build error/warning regressions/improvements in
>>>> v5.16-rc1[1] compared to v5.15[2].
>>>>
>>>> Summarized:
>>>>   - build errors: +20/-13
>>>>   - build warnings: +3/-28
>>>>
>>>> Happy fixing! ;-)
>>>>
>>>> Thanks to the linux-next team for providing the build service.
>>>>
>>>> [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/fa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf/  (all 90 configs)
>>>> [2] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/8bb7eca972ad531c9b149c0a51ab43a417385813/  (all 90 configs)
>>>>
>>>>
>>>> *** ERRORS ***
>>>>
>>>> 20 error regressions:
>>>>   + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: expected ':' before '__stringify':  => 33:4, 18:4
>>>>   + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: label 'l_yes' defined but not used [-Werror=unused-label]:  => 38:1, 23:1
>>>
>>>     due to static_branch_likely() in crypto/api.c
>>>
>>> parisc-allmodconfig
>>
>> fixed now in the parisc for-next git tree.
>>
>>
>>>>   + /kisskb/src/drivers/gpu/drm/msm/msm_drv.h: error: "COND" redefined [-Werror]:  => 531
>>>>   + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3252 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 47:1
>>>>   + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3360 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 499:1
>>>>   + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5344 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 334:1
>>>>   + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5380 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 354:1
>>>>   + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 1824 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 372:1
>>>>   + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 2224 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 204:1
>>>>   + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 3800 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 476:1
>>>
>>> parisc-allmodconfig
>>
>> parisc needs much bigger frame sizes, so I'm not astonished here.
>> During the v5.15 cycl I increased it to 1536 (from 1280), so I'm simply tempted to
>> increase it this time to 4096, unless someone has a better idea....
> 
> This patch set should fix the zstd stack size warnings [0]. I’ve
> verified the fix using the same tooling: gcc-8-hppa-linux-gnu.
> 
> I’ll send the PR to Linus tomorrow. I’ve been informed that it
> isn't strictly necessary to send the patches to the mailing list
> for bug fixes, but its already done, so I’ll wait and see if there
> is any feedback.

IMO several (or many more) people would disagree with that.

"strictly?"  OK, it's probably possible that almost any patch
could be merged without being on a mailing list, but it's not
desirable (except in the case of "security" patches).

-- 
~Randy

Re: Build regressions/improvements in v5.16-rc1

[Nick Terrell]

> On Nov 16, 2021, at 6:05 PM, Randy Dunlap <rdunlap@infradead.org> wrote:
> 
> On 11/16/21 5:59 PM, Nick Terrell wrote:
>>> On Nov 15, 2021, at 8:44 AM, Helge Deller <deller@gmx.de> wrote:
>>> 
>>> On 11/15/21 17:12, Geert Uytterhoeven wrote:
>>>> On Mon, Nov 15, 2021 at 4:54 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>>>>> Below is the list of build error/warning regressions/improvements in
>>>>> v5.16-rc1[1] compared to v5.15[2].
>>>>> 
>>>>> Summarized:
>>>>>  - build errors: +20/-13
>>>>>  - build warnings: +3/-28
>>>>> 
>>>>> Happy fixing! ;-)
>>>>> 
>>>>> Thanks to the linux-next team for providing the build service.
>>>>> 
>>>>> [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/fa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf/   (all 90 configs)
>>>>> [2] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/8bb7eca972ad531c9b149c0a51ab43a417385813/   (all 90 configs)
>>>>> 
>>>>> 
>>>>> *** ERRORS ***
>>>>> 
>>>>> 20 error regressions:
>>>>>  + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: expected ':' before '__stringify':  => 33:4, 18:4
>>>>>  + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: label 'l_yes' defined but not used [-Werror=unused-label]:  => 38:1, 23:1
>>>> 
>>>>    due to static_branch_likely() in crypto/api.c
>>>> 
>>>> parisc-allmodconfig
>>> 
>>> fixed now in the parisc for-next git tree.
>>> 
>>> 
>>>>>  + /kisskb/src/drivers/gpu/drm/msm/msm_drv.h: error: "COND" redefined [-Werror]:  => 531
>>>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3252 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 47:1
>>>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3360 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 499:1
>>>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5344 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 334:1
>>>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5380 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 354:1
>>>>>  + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 1824 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 372:1
>>>>>  + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 2224 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 204:1
>>>>>  + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 3800 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 476:1
>>>> 
>>>> parisc-allmodconfig
>>> 
>>> parisc needs much bigger frame sizes, so I'm not astonished here.
>>> During the v5.15 cycl I increased it to 1536 (from 1280), so I'm simply tempted to
>>> increase it this time to 4096, unless someone has a better idea....
>> This patch set should fix the zstd stack size warnings [0]. I’ve
>> verified the fix using the same tooling: gcc-8-hppa-linux-gnu.
>> I’ll send the PR to Linus tomorrow. I’ve been informed that it
>> isn't strictly necessary to send the patches to the mailing list
>> for bug fixes, but its already done, so I’ll wait and see if there
>> is any feedback.
> 
> IMO several (or many more) people would disagree with that.
> 
> "strictly?"  OK, it's probably possible that almost any patch
> could be merged without being on a mailing list, but it's not
> desirable (except in the case of "security" patches).

Good to know! Thanks for the advice, I wasn’t really sure what
the best practice is for sending patches to your own tree, as I
didn't see anything about it in the maintainer guide.

Thanks,
Nick Terrell

> -- 
> ~Randy

Re: Build regressions/improvements in v5.16-rc1

[Geert Uytterhoeven]

Hi Nick,

On Wed, Nov 17, 2021 at 3:20 AM Nick Terrell <terrelln@fb.com> wrote:
> > On Nov 16, 2021, at 6:05 PM, Randy Dunlap <rdunlap@infradead.org> wrote:
> > On 11/16/21 5:59 PM, Nick Terrell wrote:
> >> I’ll send the PR to Linus tomorrow. I’ve been informed that it
> >> isn't strictly necessary to send the patches to the mailing list
> >> for bug fixes, but its already done, so I’ll wait and see if there
> >> is any feedback.
> >
> > IMO several (or many more) people would disagree with that.
> >
> > "strictly?"  OK, it's probably possible that almost any patch
> > could be merged without being on a mailing list, but it's not
> > desirable (except in the case of "security" patches).
>
> Good to know! Thanks for the advice, I wasn’t really sure what
> the best practice is for sending patches to your own tree, as I
> didn't see anything about it in the maintainer guide.

All patches must be sent to public mailing lists for review.
You might get away with not doing that for a simple and trivial fix,
but be prepared to end up on people's "special" lists if you did get
it wrong.

We are Legion. We do not forgive. We do not forget ;-)

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: Build regressions/improvements in v5.16-rc1

[Helge Deller]

On 11/17/21 03:19, Nick Terrell wrote:
>
>
>> On Nov 16, 2021, at 6:05 PM, Randy Dunlap <rdunlap@infradead.org> wrote:
>>
>> On 11/16/21 5:59 PM, Nick Terrell wrote:
>>>> On Nov 15, 2021, at 8:44 AM, Helge Deller <deller@gmx.de> wrote:
>>>>
>>>> On 11/15/21 17:12, Geert Uytterhoeven wrote:
>>>>> On Mon, Nov 15, 2021 at 4:54 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>>>>>> Below is the list of build error/warning regressions/improvements in
>>>>>> v5.16-rc1[1] compared to v5.15[2].
>>>>>>
>>>>>> Summarized:
>>>>>>  - build errors: +20/-13
>>>>>>  - build warnings: +3/-28
>>>>>>
>>>>>> Happy fixing! ;-)
>>>>>>
>>>>>> Thanks to the linux-next team for providing the build service.
>>>>>>
>>>>>> [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/fa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf/   (all 90 configs)
>>>>>> [2] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/8bb7eca972ad531c9b149c0a51ab43a417385813/   (all 90 configs)
>>>>>>
>>>>>>
>>>>>> *** ERRORS ***
>>>>>>
>>>>>> 20 error regressions:
>>>>>>  + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: expected ':' before '__stringify':  => 33:4, 18:4
>>>>>>  + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: label 'l_yes' defined but not used [-Werror=unused-label]:  => 38:1, 23:1
>>>>>
>>>>>    due to static_branch_likely() in crypto/api.c
>>>>>
>>>>> parisc-allmodconfig
>>>>
>>>> fixed now in the parisc for-next git tree.
>>>>
>>>>
>>>>>>  + /kisskb/src/drivers/gpu/drm/msm/msm_drv.h: error: "COND" redefined [-Werror]:  => 531
>>>>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3252 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 47:1
>>>>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3360 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 499:1
>>>>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5344 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 334:1
>>>>>>  + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5380 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 354:1
>>>>>>  + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 1824 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 372:1
>>>>>>  + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 2224 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 204:1
>>>>>>  + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 3800 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 476:1
>>>>>
>>>>> parisc-allmodconfig
>>>>
>>>> parisc needs much bigger frame sizes, so I'm not astonished here.
>>>> During the v5.15 cycl I increased it to 1536 (from 1280), so I'm simply tempted to
>>>> increase it this time to 4096, unless someone has a better idea....
>>> This patch set should fix the zstd stack size warnings [0]. I’ve
>>> verified the fix using the same tooling: gcc-8-hppa-linux-gnu.
>>> I’ll send the PR to Linus tomorrow. I’ve been informed that it
>>> isn't strictly necessary to send the patches to the mailing list
>>> for bug fixes, but its already done, so I’ll wait and see if there
>>> is any feedback.
>>
>> IMO several (or many more) people would disagree with that.
>>
>> "strictly?"  OK, it's probably possible that almost any patch
>> could be merged without being on a mailing list, but it's not
>> desirable (except in the case of "security" patches).
>
> Good to know! Thanks for the advice, I wasn’t really sure what
> the best practice is for sending patches to your own tree, as I
> didn't see anything about it in the maintainer guide.

Nick, thanks a lot for your efforts to get the frame size usage down!

I've applied your patch series to the parisc for-next tree [1], so that it
gets some testing in the upstream for-next tree.
My tests so far are good, although I'm only using gcc-11.

If you don't mind, and if it doesn't generate issues for other
platforms & architectures I could submit them upstream to Linus when
I send the next pull request.

Helge

[1] https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/log/?h=for-next

Re: Build regressions/improvements in v5.16-rc1

[Nick Terrell]

> On Nov 17, 2021, at 3:22 AM, Helge Deller <deller@gmx.de> wrote:
> 
> On 11/17/21 03:19, Nick Terrell wrote:
>> 
>> 
>>> On Nov 16, 2021, at 6:05 PM, Randy Dunlap <rdunlap@infradead.org> wrote:
>>> 
>>> On 11/16/21 5:59 PM, Nick Terrell wrote:
>>>>> On Nov 15, 2021, at 8:44 AM, Helge Deller <deller@gmx.de> wrote:
>>>>> 
>>>>> On 11/15/21 17:12, Geert Uytterhoeven wrote:
>>>>>> On Mon, Nov 15, 2021 at 4:54 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>>>>>>> Below is the list of build error/warning regressions/improvements in
>>>>>>> v5.16-rc1[1] compared to v5.15[2].
>>>>>>> 
>>>>>>> Summarized:
>>>>>>> - build errors: +20/-13
>>>>>>> - build warnings: +3/-28
>>>>>>> 
>>>>>>> Happy fixing! ;-)
>>>>>>> 
>>>>>>> Thanks to the linux-next team for providing the build service.
>>>>>>> 
>>>>>>> [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/fa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf/    (all 90 configs)
>>>>>>> [2] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/8bb7eca972ad531c9b149c0a51ab43a417385813/    (all 90 configs)
>>>>>>> 
>>>>>>> 
>>>>>>> *** ERRORS ***
>>>>>>> 
>>>>>>> 20 error regressions:
>>>>>>> + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: expected ':' before '__stringify':  => 33:4, 18:4
>>>>>>> + /kisskb/src/arch/parisc/include/asm/jump_label.h: error: label 'l_yes' defined but not used [-Werror=unused-label]:  => 38:1, 23:1
>>>>>> 
>>>>>>   due to static_branch_likely() in crypto/api.c
>>>>>> 
>>>>>> parisc-allmodconfig
>>>>> 
>>>>> fixed now in the parisc for-next git tree.
>>>>> 
>>>>> 
>>>>>>> + /kisskb/src/drivers/gpu/drm/msm/msm_drv.h: error: "COND" redefined [-Werror]:  => 531
>>>>>>> + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3252 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 47:1
>>>>>>> + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 3360 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 499:1
>>>>>>> + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5344 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 334:1
>>>>>>> + /kisskb/src/lib/zstd/compress/zstd_double_fast.c: error: the frame size of 5380 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 354:1
>>>>>>> + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 1824 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 372:1
>>>>>>> + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 2224 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 204:1
>>>>>>> + /kisskb/src/lib/zstd/compress/zstd_fast.c: error: the frame size of 3800 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]:  => 476:1
>>>>>> 
>>>>>> parisc-allmodconfig
>>>>> 
>>>>> parisc needs much bigger frame sizes, so I'm not astonished here.
>>>>> During the v5.15 cycl I increased it to 1536 (from 1280), so I'm simply tempted to
>>>>> increase it this time to 4096, unless someone has a better idea....
>>>> This patch set should fix the zstd stack size warnings [0]. I’ve
>>>> verified the fix using the same tooling: gcc-8-hppa-linux-gnu.
>>>> I’ll send the PR to Linus tomorrow. I’ve been informed that it
>>>> isn't strictly necessary to send the patches to the mailing list
>>>> for bug fixes, but its already done, so I’ll wait and see if there
>>>> is any feedback.
>>> 
>>> IMO several (or many more) people would disagree with that.
>>> 
>>> "strictly?"  OK, it's probably possible that almost any patch
>>> could be merged without being on a mailing list, but it's not
>>> desirable (except in the case of "security" patches).
>> 
>> Good to know! Thanks for the advice, I wasn’t really sure what
>> the best practice is for sending patches to your own tree, as I
>> didn't see anything about it in the maintainer guide.
> 
> Nick, thanks a lot for your efforts to get the frame size usage down!
> 
> I've applied your patch series to the parisc for-next tree [1], so that it
> gets some testing in the upstream for-next tree.
> My tests so far are good, although I'm only using gcc-11.
> 
> If you don't mind, and if it doesn't generate issues for other
> platforms & architectures I could submit them upstream to Linus when
> I send the next pull request.

Sure, I’m fine with that. The only other major goal of this patch series
is to reduce code size bloat. But, that isn’t blocking development of
anyone.

I do have an update to make for patch 1 though, after some comments
from Linus. So I’ll send out a V2 shortly.

Best,
Nick Terrell

> Helge
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/log/?h=for-next

Re: Build regressions/improvements in v5.16-rc1

[Thomas Bogendoerfer]

On Mon, Nov 15, 2021 at 05:12:50PM +0100, Geert Uytterhoeven wrote:
> >   + error: modpost: "mips_cm_is64" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
> >   + error: modpost: "mips_cm_lock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
> >   + error: modpost: "mips_cm_unlock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
> >   + error: modpost: "mips_cpc_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
> >   + error: modpost: "mips_gcr_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!:  => N/A
> 
> mips-allmodconfig

there is a patchset fixing this

https://lore.kernel.org/all/20211115070809.15529-1-sergio.paracuellos@gmail.com/

> > 3 warning regressions:
> >   + <stdin>: warning: #warning syscall futex_waitv not implemented [-Wcpp]:  => 1559:2
> 
> powerpc, m68k, mips, s390, parisc (and probably more)

I've queued a patch to fix this for mips.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]