linux-kernel - Re: [PATCH 20/22] x86,word-at-a-time: Remove .fixup usage

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Date:   Mon, 8 Nov 2021 19:29:26 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, mark.rutland@....com,
        dvyukov@...gle.com, seanjc@...gle.com, pbonzini@...hat.com,
        mbenes@...e.cz, ndesaulniers@...gle.com
Subject: Re: [PATCH 20/22] x86,word-at-a-time: Remove .fixup usage

On Mon, Nov 08, 2021 at 08:47:11AM -0800, Josh Poimboeuf wrote:
> On Fri, Nov 05, 2021 at 06:10:43PM +0100, Peter Zijlstra wrote:
> > +static inline unsigned long load_unaligned_zeropad(const void *addr)
> > +{
> > +	unsigned long offset, data;
> > +	unsigned long ret;
> > +
> > +	asm_volatile_goto(
> > +		"1:	mov %[mem], %[ret]\n"
> > +
> > +		_ASM_EXTABLE(1b, %l[do_exception])
> > +
> > +		: [ret] "=&r" (ret)
> > +		: [mem] "m" (*(unsigned long *)addr)
> > +		: : do_exception);
> > +
> > +out:
> > +	return ret;
> > +
> > +do_exception: __cold;
> 
> Clang doesn't approve of this label annotation:
> 
> In file included from fs/dcache.c:186:
> ./arch/x86/include/asm/word-at-a-time.h:99:15: warning: '__cold__' attribute only applies to functions [-Wignored-attributes]
> do_exception: __cold;

/me mutters something best left unsaid these days...

Nick, how come?