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

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Message-ID: <ZdK8zaBic5NNbYNw@tassilo>
Date: Sun, 18 Feb 2024 18:28:29 -0800
From: Andi Kleen <ak@...ux.intel.com>
To: Arnd Bergmann <arnd@...db.de>
Cc: Arnd Bergmann <arnd@...nel.org>,
	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 11:29:32AM +0100, Arnd Bergmann wrote:
> 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.

now == after 4/8K.

The 1024 warning limit dates back to the 4/8K times. It could
be certainly reevaluated for this decade's setup.

-Andi