linux-kernel - Re: [PATCH] fs/select: rework stack allocation hack for clang

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Message-Id: <3a829098-612b-4e5a-bcec-3727acee7ff8@app.fastmail.com>
Date: Sun, 18 Feb 2024 11:29:32 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Andi Kleen" <ak@...ux.intel.com>, "Arnd Bergmann" <arnd@...nel.org>
Cc: "Alexander Viro" <viro@...iv.linux.org.uk>,
 "Christian Brauner" <brauner@...nel.org>, "Jan Kara" <jack@...e.cz>,
 "Nathan Chancellor" <nathan@...nel.org>,
 "Nick Desaulniers" <ndesaulniers@...gle.com>,
 "Bill Wendling" <morbo@...gle.com>, "Justin Stitt" <justinstitt@...gle.com>,
 "Kees Cook" <keescook@...omium.org>,
 "Andrew Morton" <akpm@...ux-foundation.org>, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] fs/select: rework stack allocation hack for clang

On Sun, Feb 18, 2024, at 11:19, Andi Kleen wrote:
> I suspect given the larger default stack now we could maybe just increase the
> warning limit too, but that should be fine.

I don't think we have increased the default stack size in decades,
it's still 8KB on almost all 32-bit architectures (sh, hexagon and m68k
still allow 4KB stacks, but that's probably broken). I would actually
like to (optionally) reduce the stack size for 64-bit machines
from 16KB to 12KB now that it's always vmapped.

> Reviewed-by: Andi Kleen <ak@...ux.intel.com>

Thanks,

    Arnd