linux-kernel - Re: [PATCHv3, resend] powerpc: mm: radix

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Message-ID: <87fsi3ce28.fsf@mpe.ellerman.id.au>
Date:   Thu, 11 Aug 2022 19:41:35 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Anders Roxell <anders.roxell@...aro.org>, nathan@...nel.org,
        ndesaulniers@...gle.com
Cc:     llvm@...ts.linux.dev, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org,
        Anders Roxell <anders.roxell@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Subject: Re: [PATCHv3, resend] powerpc: mm: radix_tlb: rearrange the if-else
 block

Anders Roxell <anders.roxell@...aro.org> writes:
> Clang warns:
>
> arch/powerpc/mm/book3s64/radix_tlb.c:1191:23: error: variable 'hstart' is uninitialized when used here [-Werror,-Wuninitialized]
>                                 __tlbiel_va_range(hstart, hend, pid,
>                                                   ^~~~~~
> arch/powerpc/mm/book3s64/radix_tlb.c:1175:23: note: initialize the variable 'hstart' to silence this warning
>                 unsigned long hstart, hend;
>                                     ^
>                                      = 0
> arch/powerpc/mm/book3s64/radix_tlb.c:1191:31: error: variable 'hend' is uninitialized when used here [-Werror,-Wuninitialized]
>                                 __tlbiel_va_range(hstart, hend, pid,
>                                                           ^~~~
> arch/powerpc/mm/book3s64/radix_tlb.c:1175:29: note: initialize the variable 'hend' to silence this warning
>                 unsigned long hstart, hend;
>                                           ^
>                                            = 0
> 2 errors generated.

Which version & config are you building?

I don't see this warning in my test builds.

cheers