linux-kernel - Re: [PATCH 02/10] x86, asm: use bool for bitops and other assembly outputs

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Message-ID: <20160608074956.GO30154@twins.programming.kicks-ass.net>
Date:	Wed, 8 Jun 2016 09:49:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 02/10] x86, asm: use bool for bitops and other assembly
 outputs

On Tue, Jun 07, 2016 at 04:31:01PM -0700, H. Peter Anvin wrote:
> From: "H. Peter Anvin" <hpa@...or.com>
> 
> The gcc people have confirmed that using "bool" when combined with
> inline assembly always is treated as a byte-sized operand that can be
> assumed to be 0 or 1, which is exactly what the SET instruction
> emits.  Change the output types and intermediate variables of as many
> operations as practical to "bool".
> 
> Signed-off-by: H. Peter Anvin <hpa@...or.com>
> ---
>  arch/x86/boot/bitops.h             |  8 +++++---
>  arch/x86/boot/boot.h               |  8 ++++----
>  arch/x86/boot/string.c             |  2 +-
>  arch/x86/include/asm/apm.h         |  6 +++---
>  arch/x86/include/asm/archrandom.h  | 16 ++++++++--------
>  arch/x86/include/asm/atomic.h      |  8 ++++----
>  arch/x86/include/asm/atomic64_64.h | 10 +++++-----
>  arch/x86/include/asm/bitops.h      | 28 ++++++++++++++--------------
>  arch/x86/include/asm/local.h       |  8 ++++----
>  arch/x86/include/asm/percpu.h      |  8 ++++----
>  arch/x86/include/asm/rmwcc.h       |  4 ++--
>  arch/x86/include/asm/rwsem.h       | 17 +++++++++--------
>  include/linux/random.h             | 12 ++++++------
>  13 files changed, 69 insertions(+), 66 deletions(-)

So the only concern I have with this is that the x86 function signatures
are now different from the other architectures.

Not sure how much if anything that matters..