linux-kernel - Re: [PATCH RFC 4/5] x86/alternative: Improve code generation readability

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Message-ID: <lk33e6ldcyilu6bejru63wzfkfyqt7czvhjotvqlhnp34qnw4n@kt6wt4lwfu7q>
Date: Wed, 9 Apr 2025 14:27:25 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>, x86@...nel.org, 
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH RFC 4/5] x86/alternative: Improve code generation
 readability

On Wed, Apr 09, 2025 at 02:20:55PM -0700, Linus Torvalds wrote:
> On Wed, 9 Apr 2025 at 12:51, Josh Poimboeuf <jpoimboe@...nel.org> wrote:
> >
> > What if we were to use a global asm() to define an alternative .macro
> > whenever "alternative.h" gets included?
> 
> Yeah, I wouldn't mind that, but I have this dim memory of us having
> tried it at some point and it didn't work.
> 
> I think the issue was that the in-compiler assembler was not as
> complete as the external one (ie not doing macros at all or something
> like that).

It seems to work with GCC 14 and Clang 18 at least.  I can try to find
some old toolchains to test with.

-- 
Josh