linux-kernel - Re: [PATCH] fs/select: avoid clang stack usage warning

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Message-ID: <a4e18a6c-d03a-d4fc-fb7e-d8bf37e85ce0@linux.intel.com>
Date:   Thu, 13 Oct 2022 16:52:09 -0400
From:   Andi Kleen <ak@...ux.intel.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-fsdevel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        Eric Dumazet <edumazet@...gle.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] fs/select: avoid clang stack usage warning


>> I wonder if there is a way to disable the warning or increase the
>> threshold just for this function. I don't think attribute optimize would
>> work, but perhaps some pragma?
> Here's what I would have guessed, the pragma approach seems a little broken.
> https://godbolt.org/z/vY7fGYv7f
> Maybe I'm holding it wrong?

Thanks. Looks like the warning setting is not propagated to the point 
where the warning is generated in the backend. Could file a gcc bug on 
that, but yes the solution won't work for now.

-Andi