linux-kernel - Re: [PATCH] fs/select: mark do_select noinline_for

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Date:   Mon, 10 Oct 2022 09:44:09 +0200
From:   Christoph Hellwig <hch@....de>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Nathan Chancellor <nathan@...nel.org>,
        Tom Rix <trix@...hat.com>, Xiaoming Ni <nixiaoming@...wei.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Christoph Hellwig <hch@....de>,
        Eric Dumazet <edumazet@...gle.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] fs/select: mark do_select noinline_for_stack for 32b

On Fri, Oct 07, 2022 at 01:11:40PM -0700, Nick Desaulniers wrote:
> Effectively a revert of
> commit ad312f95d41c ("fs/select: avoid clang stack usage warning")
> 
> Various configs can still push the stack useage of core_sys_select()
> over the CONFIG_FRAME_WARN threshold (1024B on 32b targets).
> 
>   fs/select.c:619:5: error: stack frame size of 1048 bytes in function
>   'core_sys_select' [-Werror,-Wframe-larger-than=]

Btw, I also see a warning here with all my KASAN x86_64 gcc builds.