linux-kernel - Re: [PATCH] compiler_types: Provide __no_kstack

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Message-ID: <CAHk-=wh9qD2tY4+C9mjPviAZLHJ+Bix3KyBfKKYfYbP1XxnUVw@mail.gmail.com>
Date: Tue, 29 Jul 2025 16:15:58 -0700
From: Linus Torvalds <torvalds@...uxfoundation.org>
To: Marco Elver <elver@...gle.com>
Cc: Kees Cook <kees@...nel.org>, kernel test robot <lkp@...el.com>, 
	syzbot+5245cb609175fb6e8122@...kaller.appspotmail.com, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>, 
	Hou Wenlong <houwenlong.hwl@...group.com>, "Kirill A . Shutemov" <kas@...nel.org>, 
	Miguel Ojeda <ojeda@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Przemek Kitszel <przemyslaw.kitszel@...el.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Masahiro Yamada <masahiroy@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Wei Yang <richard.weiyang@...il.com>, Sami Tolvanen <samitolvanen@...gle.com>, 
	Arnd Bergmann <arnd@...db.de>, Christophe Leroy <christophe.leroy@...roup.eu>, 
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>, Bill Wendling <morbo@...gle.com>, 
	Justin Stitt <justinstitt@...gle.com>, Michael Kelley <mhklinux@...look.com>, 
	Marc Herbert <Marc.Herbert@...ux.intel.com>, Yafang Shao <laoar.shao@...il.com>, 
	Uros Bizjak <ubizjak@...il.com>, Jan Hendrik Farr <kernel@...rr.cc>, linux-kernel@...r.kernel.org, 
	llvm@...ts.linux.dev, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] compiler_types: Provide __no_kstack_erase to disable
 coverage only on Clang

On Tue, 29 Jul 2025 at 16:01, Marco Elver <elver@...gle.com> wrote:
>
> I think this belongs into compiler-clang.h, we've typically refrained
> from ifdef CC_IS_CLANG/GCC in the generic headers.
> See __nocfi for an example, where compiler_types.h provides a default
> empty definition, and compiler-clang.h provides a non-empty
> definition.

Yeah, I think that would be a lot cleaner and matches the other things
like this.

               Linus