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Date: Sun, 18 Feb 2024 18:28:29 -0800
From: Andi Kleen <ak@linux.intel.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Arnd Bergmann <arnd@kernel.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Bill Wendling <morbo@google.com>,
	Justin Stitt <justinstitt@google.com>,
	Kees Cook <keescook@chromium.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	llvm@lists.linux.dev
Subject: Re: [PATCH] fs/select: rework stack allocation hack for clang
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References: <20240216202352.2492798-1-arnd@kernel.org>
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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