linux-kernel - Re: x86/include/asm/arch_hweight.h:49:15: error: invalid input size for constraint 'D'

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Date:   Tue, 7 Feb 2023 09:28:58 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     llvm@...ts.linux.dev, open list <linux-kernel@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        lkft-triage@...ts.linaro.org, borislav.petkov@....com,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: x86/include/asm/arch_hweight.h:49:15: error: invalid input size
 for constraint 'D'

Hi Naresh,

On Tue, Feb 07, 2023 at 01:27:05PM +0530, Naresh Kamboju wrote:
> Following Build regressions warnings / errors noticed on Linux next-20230207.
> 
> Regressions found on x86_64:
> 
>     - build/clang-15-lkftconfig-compat
>     - build/clang-nightly-lkftconfig
>     - build/clang-15-lkftconfig
>     - build/clang-15-lkftconfig-kcsan
>     - build/clang-lkftconfig
> 
> In file included from arch/x86/entry/vdso/vdso32/vgetcpu.c:2:
> In file included from arch/x86/entry/vdso/vdso32/../vgetcpu.c:8:
> In file included from include/linux/kernel.h:22:
> In file included from include/linux/bitops.h:68:
> In file included from arch/x86/include/asm/bitops.h:420:
> arch/x86/include/asm/arch_hweight.h:49:15: error: invalid input size
> for constraint 'D'
>                          : REG_IN (w));
>                                    ^
> In file included from arch/x86/entry/vdso/vdso32/vgetcpu.c:2:
> In file included from arch/x86/entry/vdso/vdso32/../vgetcpu.c:8:
> In file included from include/linux/kernel.h:25:
> In file included from include/linux/math.h:6:
> arch/x86/include/asm/div64.h:85:34: error: invalid output size for
> constraint '=a'
>         asm ("mulq %2; divq %3" : "=a" (q)
>                                         ^
> 2 errors generated.
> 
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

Thanks a lot for the report as always! Looks like there is a fix pending
on the list:

https://lore.kernel.org/Y+IsCWQdXEr8d9Vy@linutronix.de/

Cheers,
Nathan