linux-kernel - Re: [PATCH v2 43/62] x86/alternative: Define ELF section entry size for alternatives

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Message-ID: <tv2gorcohozg6ppwetgi5qqgoabsrv62qbgsgph6z7zk6vxln2@qmgsjufyenjh>
Date: Fri, 9 May 2025 14:54:00 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Borislav Petkov <bp@...en8.de>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, 
	Petr Mladek <pmladek@...e.com>, Miroslav Benes <mbenes@...e.cz>, 
	Joe Lawrence <joe.lawrence@...hat.com>, live-patching@...r.kernel.org, Song Liu <song@...nel.org>, 
	laokz <laokz@...mail.com>, Jiri Kosina <jikos@...nel.org>, 
	Marcos Paulo de Souza <mpdesouza@...e.com>, Weinan Liu <wnliu@...gle.com>, 
	Fazla Mehrab <a.mehrab@...edance.com>, Chen Zhongjin <chenzhongjin@...wei.com>, 
	Puranjay Mohan <puranjay@...nel.org>
Subject: Re: [PATCH v2 43/62] x86/alternative: Define ELF section entry size
 for alternatives

On Fri, May 09, 2025 at 11:36:35PM +0200, Borislav Petkov wrote:
> On Fri, May 09, 2025 at 01:17:07PM -0700, Josh Poimboeuf wrote:
> > +#define ALTINSTR_SIZE		14
> 
> We have sizeof(struct alt_instr) to offer...

Right, but IIRC, sizeof(struct alt_instr) isn't available at macro
expansion time so it would have to be provided as an input constraint.

That doesn't really work for the ALTERNATIVE macro, where the asm
constraints are out of our control because they're set by the caller.

-- 
Josh