linux-kernel - Re: [PATCH 1/1] security: Used macros from compiler.h instead of __attribute_

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Date:	Wed, 18 Jun 2014 16:58:25 -0400
From:	Paul Moore <paul@...l-moore.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Gideon Israel Dsouza <gidisrael@...il.com>, sds@...ho.nsa.gov,
	Eric Paris <eparis@...isplace.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-security-module@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] security: Used macros from compiler.h instead of __attribute__((...))

On Wednesday, June 18, 2014 10:08:13 PM Geert Uytterhoeven wrote:
> On Wed, Jun 18, 2014 at 8:50 PM, Paul Moore <paul@...l-moore.com> wrote:
> > On Wednesday, June 11, 2014 09:25:30 PM Gideon Israel Dsouza wrote:
> >> To increase compiler portability there is <linux/compiler.h> which
> >> provides convenience macros for various gcc constructs.  Eg: __packed
> >> for __attribute__((packed)).
> >> 
> >> This patch is part of a large task I've taken to clean the gcc
> >> specific attributes and use the the macros instead.
> >> 
> >> Signed-off-by: Gideon Israel Dsouza <gidisrael@...il.com>
> >> ---
> >> 
> >>  security/selinux/include/security.h | 3 ++-
> >>  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > From what I can tell this should still work with both the LLVM and Intel
> > compilers, is that correct?
> 
> That's the idea of the compiler-agnostic attribute macros.

I just wanted to make sure as I personally only really use gcc and don't 
pretend to be up on all the details regarding other compilers.

> Interestingly, only include/linux/compiler-gcc.h defines __packed.

>From what I could tell by looking at the code, the other compilers all define 
__GNUC__ so they get the __packed macro as part of the gcc configuration.  I 
believe the LLVM and Intel compilers would only need to redefine __packed if 
they wanted/needed a different definition.

> As it's already in heavy use, I can only assume both LLVM and the Intel
> compilers handle both "__packed" (without a special definition) and the
> gcc-specific "__attribute__((packed))".

Yep, seems reasonable.  I'll go ahead and apply the patch.

-- 
paul moore
www.paul-moore.com

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