linux-kernel - Re: [PATCH v5 01/10] x86/asm: Add FP

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Date:	Thu, 11 Jun 2015 06:22:49 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Pavel Machek <pavel@....cz>
cc:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 01/10] x86/asm: Add FP_SAVE/RESTORE frame pointer
 macros

On Wed, 10 Jun 2015, Pavel Machek wrote:

> > diff --git a/arch/x86/include/asm/func.h b/arch/x86/include/asm/func.h
> > new file mode 100644
> > index 0000000..4d62782
> > --- /dev/null
> > +++ b/arch/x86/include/asm/func.h
> > @@ -0,0 +1,24 @@
> > +#ifndef _ASM_X86_FUNC_H
> > +#define _ASM_X86_FUNC_H
> > +
> > +#include <linux/linkage.h>
> > +#include <asm/asm.h>
> > +
> > +/*
> > + * These are frame pointer save and restore macros.  They should be used by
> > + * every callable non-leaf asm function.
> > + */
> > +.macro FP_SAVE name
> > +	.if CONFIG_FRAME_POINTER
> > +		push %_ASM_BP
> > +		_ASM_MOV %_ASM_SP, %_ASM_BP
> > +	.endif
> > +.endm
> 
> Hmm. This will not compile when included into .c file. Should it have
> other extension than .h? (Or can the macros be done in different way?

We have quite a few of .h headers in the kernel already which are supposed 
to be included only by .S files, so what exactly is the problem you are 
seeing here?

-- 
Jiri Kosina
SUSE Labs
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