* [PATCH] atomic64: No need for CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
@ 2016-09-08 16:28 Vineet Gupta
2016-09-08 18:19 ` Peter Zijlstra
2016-09-11 4:31 ` kbuild test robot
0 siblings, 2 replies; 5+ messages in thread
From: Vineet Gupta @ 2016-09-08 16:28 UTC (permalink / raw)
To: linux-kernel
Cc: Alexey Brodkin, Vineet Gupta, Richard Henderson, Ivan Kokshaysky,
Matt Turner, Russell King, Catalin Marinas, Will Deacon,
Ralf Baechle, James E.J. Bottomley, Helge Deller,
Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Martin Schwidefsky, Heiko Carstens, David S. Miller,
Chris Metcalf, Thomas Gleixner, Ingo Molnar, H. Peter Anvin, x86,
Andrew Morton, Zhaoxiu Zeng, Linus Walleij, Matthew Wilcox,
Alexander Potapenko, Andrey Ryabinin, Herbert Xu, Ming Lin,
Arnd Bergmann, Geert Uytterhoeven, Peter Zijlstra,
Borislav Petkov, Andi Kleen, Boqun Feng, linux-alpha,
linux-arm-kernel, linux-mips, linux-parisc, linuxppc-dev,
linux-s390, sparclinux, linux-snps-arc, linux-arch
This came to light when implementing native 64-bit atomics for ARCv2.
The atomic64 self-test code uses CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
to check whether atomic64_dec_if_positive() is available.
It seems it was needed when not every arch defined it.
However as of current code the Kconfig option seems needless
- for CONFIG_GENERIC_ATOMIC64 it is auto-enabled in lib/Kconfig and a
generic definition of API is present lib/atomic64.c
- arches with native 64-bit atomics select it in arch/*/Kconfig and
define the API in their headers
So I see no point in keeping the Kconfig option
Compile tested for 2 representatives:
- blackfin (CONFIG_GENERIC_ATOMIC64)
- x86 (!CONFIG_GENERIC_ATOMIC64)
Also logistics wise it seemed simpler to just do this in 1 patch vs.
splitting per arch - but I can break it up if maintainer feel that
is better to avoid conflicts.
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Zhaoxiu Zeng <zhaoxiu.zeng@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Ming Lin <ming.l@ssi.samsung.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: linux-alpha@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mips@linux-mips.org
Cc: linux-parisc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-s390@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Cc: linux-snps-arc@lists.infradead.org
Cc: linux-arch@vger.kernel.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
arch/alpha/Kconfig | 1 -
arch/arm/Kconfig | 1 -
arch/arm64/Kconfig | 1 -
arch/mips/Kconfig | 1 -
arch/parisc/Kconfig | 1 -
arch/powerpc/Kconfig | 1 -
arch/s390/Kconfig | 1 -
arch/sparc/Kconfig | 1 -
arch/tile/Kconfig | 1 -
arch/x86/Kconfig | 1 -
lib/Kconfig | 3 ---
lib/atomic64_test.c | 4 ----
12 files changed, 17 deletions(-)
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 7f312d80b43b..0e49d39ea74a 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -15,7 +15,6 @@ config ALPHA
select GENERIC_IRQ_SHOW
select ARCH_WANT_IPC_PARSE_VERSION
select ARCH_HAVE_NMI_SAFE_CMPXCHG
- select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select AUDIT_ARCH
select GENERIC_CLOCKEVENTS
select GENERIC_SMP_IDLE_THREAD
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a9c4e48bb7ec..2a50957c7bfb 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1,7 +1,6 @@
config ARM
bool
default y
- select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index bc3f00f586f1..3df2ca7efbcc 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -6,7 +6,6 @@ config ARM64
select ACPI_MCFG if ACPI
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
- select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_KCOV
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 26388562e300..5bbea197c220 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -30,7 +30,6 @@ config MIPS
select HAVE_ARCH_TRANSPARENT_HUGEPAGE if CPU_SUPPORTS_HUGEPAGES && 64BIT
select RTC_LIB if !MACH_LOONGSON64
select GENERIC_ATOMIC64 if !64BIT
- select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select HAVE_DMA_CONTIGUOUS
select HAVE_DMA_API_DEBUG
select GENERIC_IRQ_PROBE
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index cd8778103165..9e40b52c0721 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -15,7 +15,6 @@ config PARISC
select BUILDTIME_EXTABLE_SORT
select HAVE_PERF_EVENTS
select GENERIC_ATOMIC64 if !64BIT
- select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select BROKEN_RODATA
select GENERIC_IRQ_PROBE
select GENERIC_PCI_IOMAP
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 927d2ab2ce08..18d1b42cf545 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -113,7 +113,6 @@ config PPC
select HAVE_DEBUG_KMEMLEAK
select ARCH_HAS_SG_CHAIN
select GENERIC_ATOMIC64 if PPC32
- select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select HAVE_PERF_EVENTS
select HAVE_PERF_REGS
select HAVE_PERF_USER_STACK_DUMP
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index e751fe25d6ab..af52b07efde2 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -67,7 +67,6 @@ config DEBUG_RODATA
config S390
def_bool y
- select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ELF_RANDOMIZE
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 59b09600dd32..bfedbe0cb7b2 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -22,7 +22,6 @@ config SPARC
select HAVE_ARCH_TRACEHOOK
select HAVE_EXIT_THREAD
select SYSCTL_EXCEPTION_TRACE
- select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select RTC_CLASS
select RTC_DRV_M48T59
select RTC_SYSTOHC
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 4820a02838ac..12eda5440c93 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -3,7 +3,6 @@
config TILE
def_bool y
- select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAVE_NMI_SAFE_CMPXCHG
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c580d8c33562..0cf609998550 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -23,7 +23,6 @@ config X86
select ARCH_CLOCKSOURCE_DATA
select ARCH_DISCARD_MEMBLOCK
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
- select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ELF_RANDOMIZE
diff --git a/lib/Kconfig b/lib/Kconfig
index d79909dc01ec..0e74df3c5441 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -457,9 +457,6 @@ config NLATTR
config GENERIC_ATOMIC64
bool
-config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
- def_bool y if GENERIC_ATOMIC64
-
config LRU_CACHE
tristate
diff --git a/lib/atomic64_test.c b/lib/atomic64_test.c
index dbb369145dda..46042901130f 100644
--- a/lib/atomic64_test.c
+++ b/lib/atomic64_test.c
@@ -213,7 +213,6 @@ static __init void test_atomic64(void)
r += one;
BUG_ON(v.counter != r);
-#ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
INIT(onestwos);
BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
r -= one;
@@ -226,9 +225,6 @@ static __init void test_atomic64(void)
INIT(-one);
BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
BUG_ON(v.counter != r);
-#else
-#warning Please implement atomic64_dec_if_positive for your architecture and select the above Kconfig symbol
-#endif
INIT(onestwos);
BUG_ON(!atomic64_inc_not_zero(&v));
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] atomic64: No need for CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
2016-09-08 16:28 [PATCH] atomic64: No need for CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE Vineet Gupta
@ 2016-09-08 18:19 ` Peter Zijlstra
2016-09-08 18:34 ` Vineet Gupta
2016-09-11 4:31 ` kbuild test robot
1 sibling, 1 reply; 5+ messages in thread
From: Peter Zijlstra @ 2016-09-08 18:19 UTC (permalink / raw)
To: Vineet Gupta
Cc: linux-kernel, Alexey Brodkin, Richard Henderson, Ivan Kokshaysky,
Matt Turner, Russell King, Catalin Marinas, Will Deacon,
Ralf Baechle, James E.J. Bottomley, Helge Deller,
Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman,
Martin Schwidefsky, Heiko Carstens, David S. Miller,
Chris Metcalf, Thomas Gleixner, Ingo Molnar, H. Peter Anvin, x86,
Andrew Morton, Zhaoxiu Zeng, Linus Walleij, Matthew Wilcox,
Alexander Potapenko, Andrey Ryabinin, Herbert Xu, Ming Lin,
Arnd Bergmann, Geert Uytterhoeven, Borislav Petkov, Andi Kleen,
Boqun Feng, linux-alpha, linux-arm-kernel, linux-mips,
linux-parisc, linuxppc-dev, linux-s390, sparclinux,
linux-snps-arc, linux-arch
On Thu, Sep 08, 2016 at 09:28:18AM -0700, Vineet Gupta wrote:
> This came to light when implementing native 64-bit atomics for ARCv2.
>
> The atomic64 self-test code uses CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
> to check whether atomic64_dec_if_positive() is available.
> It seems it was needed when not every arch defined it.
> However as of current code the Kconfig option seems needless
>
> - for CONFIG_GENERIC_ATOMIC64 it is auto-enabled in lib/Kconfig and a
> generic definition of API is present lib/atomic64.c
> - arches with native 64-bit atomics select it in arch/*/Kconfig and
> define the API in their headers
>
> So I see no point in keeping the Kconfig option
>
> Compile tested for 2 representatives:
> - blackfin (CONFIG_GENERIC_ATOMIC64)
> - x86 (!CONFIG_GENERIC_ATOMIC64)
>
> Also logistics wise it seemed simpler to just do this in 1 patch vs.
> splitting per arch - but I can break it up if maintainer feel that
> is better to avoid conflicts.
Works for me; you want me to take this, or do you need it for you ARCv2
patches?
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] atomic64: No need for CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
2016-09-08 18:19 ` Peter Zijlstra
@ 2016-09-08 18:34 ` Vineet Gupta
0 siblings, 0 replies; 5+ messages in thread
From: Vineet Gupta @ 2016-09-08 18:34 UTC (permalink / raw)
To: Peter Zijlstra
Cc: linux-mips@linux-mips.org, Catalin Marinas, Linus Walleij,
Alexey Brodkin, Heiko Carstens, James E.J. Bottomley,
Paul Mackerras, H. Peter Anvin, sparclinux@vger.kernel.org,
linux-arch@vger.kernel.org, linux-s390@vger.kernel.org,
Andi Kleen, Herbert Xu, Michael Ellerman, Helge Deller,
x86@kernel.org, Russell King, Ingo Molnar, Geert Uytterhoeven,
Benjamin Herrenschmidt, Matthew Wilcox, Matt Turner,
Borislav Petkov, Ming Lin, Chris Metcalf, Arnd Bergmann,
Will Deacon, Boqun Feng, Ivan Kokshaysky, Zhaoxiu Zeng,
Andrey Ryabinin, Thomas Gleixner,
linux-arm-kernel@lists.infradead.org, Richard Henderson,
linux-snps-arc@lists.infradead.org, linux-parisc@vger.kernel.org,
linux-kernel@vger.kernel.org, Ralf Baechle,
linux-alpha@vger.kernel.org, Martin Schwidefsky,
Alexander Potapenko, Andrew Morton, linuxppc-dev@lists.ozlabs.org,
David S. Miller
On 09/08/2016 11:19 AM, Peter Zijlstra wrote:
> On Thu, Sep 08, 2016 at 09:28:18AM -0700, Vineet Gupta wrote:
>> This came to light when implementing native 64-bit atomics for ARCv2.
>>
>> The atomic64 self-test code uses CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
>> to check whether atomic64_dec_if_positive() is available.
>> It seems it was needed when not every arch defined it.
>> However as of current code the Kconfig option seems needless
>>
>> - for CONFIG_GENERIC_ATOMIC64 it is auto-enabled in lib/Kconfig and a
>> generic definition of API is present lib/atomic64.c
>> - arches with native 64-bit atomics select it in arch/*/Kconfig and
>> define the API in their headers
>>
>> So I see no point in keeping the Kconfig option
>>
>> Compile tested for 2 representatives:
>> - blackfin (CONFIG_GENERIC_ATOMIC64)
>> - x86 (!CONFIG_GENERIC_ATOMIC64)
>>
>> Also logistics wise it seemed simpler to just do this in 1 patch vs.
>> splitting per arch - but I can break it up if maintainer feel that
>> is better to avoid conflicts.
> Works for me; you want me to take this, or do you need it for you ARCv2
> patches?
Please do. ARCv2 patch (following shortly) doesn't need it - I selected the
option in orig patch - which I can just take out.
Thx,
-Vineet
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] atomic64: No need for CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
2016-09-08 16:28 [PATCH] atomic64: No need for CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE Vineet Gupta
2016-09-08 18:19 ` Peter Zijlstra
@ 2016-09-11 4:31 ` kbuild test robot
[not found] ` <1473703083-8625-1-git-send-email-vgupta@synopsys.com>
1 sibling, 1 reply; 5+ messages in thread
From: kbuild test robot @ 2016-09-11 4:31 UTC (permalink / raw)
To: Vineet Gupta
Cc: kbuild-all, linux-kernel, linux-mips, Peter Zijlstra,
Catalin Marinas, Linus Walleij, Alexey Brodkin, Heiko Carstens,
James E.J. Bottomley, Paul Mackerras, H. Peter Anvin, sparclinux,
linux-arch, linux-s390, Andi Kleen, Herbert Xu, Helge Deller, x86,
Russell King, Ingo Molnar, Geert Uytterhoeven, Matthew Wilcox,
Matt Turner, Borislav Petkov, Boqun Feng, Ming Lin, Chris Metcalf,
Arnd Bergmann, Will Deacon, Vineet Gupta, Ivan Kokshaysky,
Zhaoxiu Zeng, Andrey Ryabinin, Thomas Gleixner, linux-arm-kernel,
Richard Henderson, linux-snps-arc, linux-parisc, Ralf Baechle,
linux-alpha, Martin Schwidefsky, Alexander Potapenko,
Andrew Morton, linuxppc-dev, David S. Miller
[-- Attachment #1: Type: text/plain, Size: 2424 bytes --]
Hi Vineet,
[auto build test ERROR on arm64/for-next/core]
[cannot apply to linus/master linux/master v4.8-rc5 next-20160909]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]
url: https://github.com/0day-ci/linux/commits/Vineet-Gupta/atomic64-No-need-for-CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE/20160909-013936
base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 4.9.0
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=ia64
All errors (new ones prefixed by >>):
lib/atomic64_test.c: In function 'test_atomic64':
>> lib/atomic64_test.c:217:2: error: implicit declaration of function 'atomic64_dec_if_positive' [-Werror=implicit-function-declaration]
BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
^
cc1: some warnings being treated as errors
vim +/atomic64_dec_if_positive +217 lib/atomic64_test.c
86a89380 Luca Barbieri 2010-02-24 211 INIT(v0);
9efbcd59 Luca Barbieri 2010-03-01 212 BUG_ON(!atomic64_add_unless(&v, one, v1));
86a89380 Luca Barbieri 2010-02-24 213 r += one;
86a89380 Luca Barbieri 2010-02-24 214 BUG_ON(v.counter != r);
86a89380 Luca Barbieri 2010-02-24 215
86a89380 Luca Barbieri 2010-02-24 216 INIT(onestwos);
86a89380 Luca Barbieri 2010-02-24 @217 BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
86a89380 Luca Barbieri 2010-02-24 218 r -= one;
86a89380 Luca Barbieri 2010-02-24 219 BUG_ON(v.counter != r);
86a89380 Luca Barbieri 2010-02-24 220
:::::: The code at line 217 was first introduced by commit
:::::: 86a8938078a8bb518c5376de493e348c7490d506 lib: Add self-test for atomic64_t
:::::: TO: Luca Barbieri <luca@luca-barbieri.com>
:::::: CC: H. Peter Anvin <hpa@zytor.com>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/octet-stream, Size: 44278 bytes --]
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2016-09-12 18:11 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-09-08 16:28 [PATCH] atomic64: No need for CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE Vineet Gupta
2016-09-08 18:19 ` Peter Zijlstra
2016-09-08 18:34 ` Vineet Gupta
2016-09-11 4:31 ` kbuild test robot
[not found] ` <1473703083-8625-1-git-send-email-vgupta@synopsys.com>
2016-09-12 17:58 ` [PATCH v3 2/2] " Vineet Gupta
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