Re: [PATCH 5.4 000/222] 5.4.295-rc1 review

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

On Tue, Jun 24, 2025 at 12:46:15AM +0530, Naresh Kamboju wrote:
> On Mon, 23 Jun 2025 at 18:40, Greg Kroah-Hartman
> <gregkh@linuxfoundation.org> wrote:
> >
> > This is the start of the stable review cycle for the 5.4.295 release.
> > There are 222 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 Wed, 25 Jun 2025 13:05:50 +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-5.4.295-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-5.4.y
> > and the diffstat can be found below.
> >
> > thanks,
> >
> > greg k-h
> 
> Regressions on arm defconfig builds with gcc-12 and clang failed on
> the Linux stable-rc 5.4.295-rc1.
> 
> Regressions found on arm
> * arm, build
>   - clang-20-axm55xx_defconfig
>   - clang-20-defconfig
>   - clang-20-lkftconfig
>   - clang-20-lkftconfig-no-kselftest-frag
>   - clang-nightly-axm55xx_defconfig
>   - clang-nightly-defconfig
>   - clang-nightly-lkftconfig
>   - gcc-12-axm55xx_defconfig
>   - gcc-12-defconfig
>   - gcc-12-lkftconfig
>   - gcc-12-lkftconfig-debug
>   - gcc-12-lkftconfig-kasan
>   - gcc-12-lkftconfig-kunit
>   - gcc-12-lkftconfig-libgpiod
>   - gcc-12-lkftconfig-no-kselftest-frag
>   - gcc-12-lkftconfig-perf
>   - gcc-12-lkftconfig-rcutorture
>   - gcc-8-axm55xx_defconfig
>   - gcc-8-defconfig
> 
> Regression Analysis:
>  - New regression? Yes
>  - Reproducibility? Yes
> 
> Build regression: stable-rc 5.4.295-rc1 arm kvm init.S Error selected
> processor does not support `eret' in ARM mode
> 
> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
> 
> 
> ## Build errors
> arch/arm/kvm/init.S: Assembler messages:
> arch/arm/kvm/init.S:109: Error: selected processor does not support
> `eret' in ARM mode
> arch/arm/kvm/init.S:116: Error: Banked registers are not available
> with this architecture. -- `msr ELR_hyp,r1'
> arch/arm/kvm/init.S:145: Error: selected processor does not support
> `eret' in ARM mode
> arch/arm/kvm/init.S:149: Error: selected processor does not support
> `eret' in ARM mode
> make[2]: *** [scripts/Makefile.build:345: arch/arm/kvm/init.o] Error 1
> 
> and
> /tmp/cc0RDxs9.s: Assembler messages:
> /tmp/cc0RDxs9.s:45: Error: selected processor does not support `smc
> #0' in ARM mode
> /tmp/cc0RDxs9.s:94: Error: selected processor does not support `smc
> #0' in ARM mode
> /tmp/cc0RDxs9.s:160: Error: selected processor does not support `smc
> #0' in ARM mode
> /tmp/cc0RDxs9.s:296: Error: selected processor does not support `smc
> #0' in ARM mode
> make[3]: *** [/builds/linux/scripts/Makefile.build:262:
> drivers/firmware/qcom_scm-32.o] Error 1

That's odd, both clang and gcc don't like this?  Any chance you can do
'git bisect' to track down the offending commit?

thanks,

greg k-h