linux-kernel - Re: [PATCH] smp: fix smp_call_function_single

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Date:   Thu, 29 Apr 2021 11:17:16 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     arnd@...nel.org
Cc:     arnd@...db.de, axboe@...nel.dk, bp@...e.de, eric.dumazet@...il.com,
        jgross@...e.com, jiancai@...gle.com, linux-kernel@...r.kernel.org,
        linux@...ck-us.net, mpe@...erman.id.au, peterz@...radead.org,
        tglx@...utronix.de, ying.huang@...el.com,
        Nathan Chancellor <nathan@...nel.org>,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] smp: fix smp_call_function_single_async prototype

(replying manually to
https://lore.kernel.org/lkml/20210429150940.3256656-1-arnd@kernel.org/)

Thanks for the patch; with this applied I observe the following new warnings
though (for x86_64 defconfig; make LLVM=1 LLVM_IAS=1 -j72)

kernel/smp.c:515:19: warning: passing 8-byte aligned argument to 32-byte
aligned parameter 1 of 'csd_lock_record' may result in an unaligned pointer
access [-Walign-mismatch]
                csd_lock_record(csd);
                                ^
kernel/smp.c:516:14: warning: passing 8-byte aligned argument to 32-byte
aligned parameter 1 of 'csd_unlock' may result in an unaligned pointer access
[-Walign-mismatch]
                csd_unlock(csd);
                           ^
kernel/smp.c:525:14: warning: passing 8-byte aligned argument to 32-byte
aligned parameter 1 of 'csd_unlock' may result in an unaligned pointer access
[-Walign-mismatch]
                csd_unlock(csd);
                           ^