linux-kernel - Re: next: x86_64 defconfig with clang-17 failed

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Date: Thu, 28 Mar 2024 11:50:17 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: open list <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
 Linux Regressions <regressions@...ts.linux.dev>,
 lkft-triage@...ts.linaro.org, clang-built-linux <llvm@...ts.linux.dev>,
 Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers
 <ndesaulniers@...gle.com>, Baolin Wang <baolin.wang@...ux.alibaba.com>,
 willy@...radead.org, David Hildenbrand <david@...hat.com>
Subject: Re: next: x86_64 defconfig with clang-17 failed

On Thu, 28 Mar 2024 19:05:51 +0530 Naresh Kamboju <naresh.kamboju@...aro.org> wrote:

> While building x86_64 defconfig with clang-17 the following build warnings /
> errors noticed on Linux next-20240328 tag.
> 
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> 
> Build error:
> ---------
> mm/memory.c:5094:25: error: variable 'pte' is uninitialized when used
> here [-Werror,-Wuninitialized]
>  5094 |                         writable = pte_write(pte);
>       |                                              ^~~
> mm/memory.c:5083:3: note: variable 'pte' is declared here
>  5083 |                 pte_t pte, old_pte;
>       |                 ^

Thanks.  Presumably ptent was intended, but this may not have had
adequate runtime testing.  I'll drop the two-patch series "support
multi-size THP numa balancing".