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

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Message-ID: <20150610181732.GB2993@amd>
Date:	Wed, 10 Jun 2015 20:17:32 +0200
From:	Pavel Machek <pavel@....cz>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	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 2015-06-10 07:06:09, Josh Poimboeuf wrote:
> Add the FP_SAVE and FP_RESTORE asm macros, which can be used to save and
> restore the frame pointer.

Add a changelog, which can be used to tell what changed.

> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> ---
>  arch/x86/include/asm/func.h | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>  create mode 100644 arch/x86/include/asm/func.h
> 
> 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?

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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