linux-kernel - Re: [PATCH] linkage: Fix issue with missing symbol size

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Message-ID: <20220429201249.5hjcutds4wmkhemr@treble>
Date:   Fri, 29 Apr 2022 13:12:49 -0700
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, mark.rutland@....com, linux-kernel@...r.kernel.org,
        linux-toolchains@...r.kernel.org
Subject: Re: [PATCH] linkage: Fix issue with missing symbol size

On Fri, Apr 29, 2022 at 11:18:59AM +0200, Peter Zijlstra wrote:
> 
> Occasionally, typically when a function doesn't end with 'ret', an
> alias on that function will have 0 size.
> 
> The difference between what GCC generates and our linkage magic, is
> that GCC doesn't appear to provide .size for the alias'ed symbol at
> all. And indeed, removing this directive cures the issue.
> 
> Additionally, GCC also doesn't emit .type for alias symbols either, so
> also omit that.
> 
> Fixes: e0891269a8c2 ("linkage: add SYM_FUNC_ALIAS{,_LOCAL,_WEAK}()")
> Suggested-by: Mark Rutland <mark.rutland@....com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>

-- 
Josh