Re: [PATCH 5.15 000/245] 5.15.150-rc1 review

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Thu, Feb 29, 2024 at 12:19:40PM -0800, Guenter Roeck wrote:
> On 2/29/24 11:54, Greg Kroah-Hartman wrote:
> > On Tue, Feb 27, 2024 at 12:56:32PM -0600, Daniel Díaz wrote:
> > > Hello!
> > > 
> > > On 27/02/24 7:23 a. m., Greg Kroah-Hartman wrote:
> > > > This is the start of the stable review cycle for the 5.15.150 release.
> > > > There are 245 patches in this series, all will be posted as a response
> > > > to this one.  If anyone has any issues with these being applied, please
> > > > let me know.
> > > > 
> > > > Responses should be made by Thu, 29 Feb 2024 13:15:36 +0000.
> > > > Anything received after that time might be too late.
> > > > 
> > > > The whole patch series can be found in one patch at:
> > > > 	https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.15.150-rc1.gz
> > > > or in the git tree and branch at:
> > > > 	git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.15.y
> > > > and the diffstat can be found below.
> > > > 
> > > > thanks,
> > > > 
> > > > greg k-h
> > > 
> > > We're seeing build regressions here with RISC-V, with GCC 8, GCC 12, and Clang 17:
> > > 
> > > -----8<-----
> > >    In file included from /builds/linux/include/linux/list.h:9,
> > >                     from /builds/linux/include/linux/module.h:12,
> > >                     from /builds/linux/drivers/net/ethernet/realtek/r8169_main.c:12:
> > >    /builds/linux/drivers/net/ethernet/realtek/r8169_main.c:5512:35: error: 'rtl8169_pm_ops' undeclared here (not in a function); did you mean 'rtl8169_poll'?
> > >     5512 |         .driver.pm      = pm_ptr(&rtl8169_pm_ops),
> > >          |                                   ^~~~~~~~~~~~~~
> > >    /builds/linux/include/linux/kernel.h:46:44: note: in definition of macro 'PTR_IF'
> > >       46 | #define PTR_IF(cond, ptr)       ((cond) ? (ptr) : NULL)
> > >          |                                            ^~~
> > >    /builds/linux/drivers/net/ethernet/realtek/r8169_main.c:5512:27: note: in expansion of macro 'pm_ptr'
> > >     5512 |         .driver.pm      = pm_ptr(&rtl8169_pm_ops),
> > >          |                           ^~~~~~
> > >    make[5]: *** [/builds/linux/scripts/Makefile.build:289: drivers/net/ethernet/realtek/r8169_main.o] Error 1
> > > ----->8-----
> > > 
> > > Bisection points to:
> > > 
> > >    commit ac2871f646a8f556203f5b6be875ce406d855ddb
> > >    Author: Paul Cercueil <paul@crapouillou.net>
> > >    Date:   Tue Dec 7 00:20:59 2021 +0000
> > >        PM: core: Redefine pm_ptr() macro
> > >        [ Upstream commit c06ef740d401d0f4ab188882bf6f8d9cf0f75eaf ]
> > > 
> > > A revert could not be done cleanly.
> > > 
> > > Tuxmake reproducer:
> > > 
> > >    tuxmake --runtime podman --target-arch riscv --toolchain gcc-12 --kconfig defconfig
> > > 
> > > Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> > 
> > I've been beating on this for a while and I really don't know what is
> > happening, sorry.  The driver looks fine, something is "odd" with riscv
> 
> No, the driver is not fine. Upstream has commit 8fe6e670640e ("r8169: use new
> PM macros") which makes rtl8169_pm_ops unconditional. That commit is missing
> in v5.15.y. Applying it makes the problem disappear.
> 
> In other words, the problem is not riscv specific, but will be seen if the
> realtek driver is built with CONFIG_PM=n (which happens to be the case with
> riscv:defconfig).

Ugh, that wasn't obvious, I was thinking that the CONFIG_PM thing would
have worked properly there and was digging in riscv code all over the
place...

Thanks for this, now queued up.

greg k-h