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From: "H. Peter Anvin" <hpa@zytor.com>
To: Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>
Cc: "H. Peter Anvin" <hpa@linux.intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH 02/10] x86, asm: use bool for bitops and other assembly outputs
Date: Wed, 8 Jun 2016 01:55:19 -0700	[thread overview]
Message-ID: <02ee64ce-257a-ba93-1f49-6877f5e4f6db@zytor.com> (raw)
In-Reply-To: <20160608083340.GC9645@gmail.com>

On 06/08/16 01:33, Ingo Molnar wrote:
> 
> Note that this particular build error was introduced by b0bdba9825fe, a later 
> patch in this series - but in generaly I'm uneasy about allowing function 
> signatures diverge between architectures.
> 

For the bitops, they already do: PowerPC, for example, have "unsigned
long" in places where x86 has "int".  This is obviously undesirable, but
apparently we have not found it enough of a problem to deal with.  One
could easily argue the ppc definition is the better one; I was myself
considering promoting the x86 side to "long" to handle enormous bitmaps.
 At the same time, it is hard to avoid the fact that ppc has unsigned
bitops operations and x86 has signed ones when they are both native
instructions.

	-hpa

  reply	other threads:[~2016-06-08  8:56 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-07 23:30 [PATCH 00/10] x86: use gcc 6+ asm flag output feature H. Peter Anvin
2016-06-07 23:31 ` [PATCH 01/10] x86, bitops: remove use of "sbb" to return CF H. Peter Anvin
2016-06-07 23:39   ` [tip:x86/asm] " tip-bot for H. Peter Anvin
2016-06-07 23:31 ` [PATCH 02/10] x86, asm: use bool for bitops and other assembly outputs H. Peter Anvin
2016-06-07 23:40   ` [tip:x86/asm] " tip-bot for H. Peter Anvin
2016-06-08  7:49   ` [PATCH 02/10] " Peter Zijlstra
2016-06-08  8:28     ` Ingo Molnar
2016-06-08  8:33       ` Ingo Molnar
2016-06-08  8:55         ` H. Peter Anvin [this message]
2016-06-08  9:01           ` Ingo Molnar
2016-06-08  9:12             ` H. Peter Anvin
2016-06-08  9:20               ` Ingo Molnar
2016-06-08  9:31                 ` H. Peter Anvin
2016-06-08  9:39                   ` Peter Zijlstra
2016-06-08  9:43                     ` H. Peter Anvin
2016-06-08  9:40                 ` H. Peter Anvin
2016-06-08  8:58       ` H. Peter Anvin
2016-06-08  9:06         ` Ingo Molnar
2016-06-07 23:31 ` [PATCH 03/10] x86, asm: change the GEN_*_RMWcc() macros to not quote the condition H. Peter Anvin
2016-06-07 23:40   ` [tip:x86/asm] " tip-bot for H. Peter Anvin
2016-06-07 23:31 ` [PATCH 04/10] x86, asm: define CC_SET() and CC_OUT() macros H. Peter Anvin
2016-06-07 23:40   ` [tip:x86/asm] " tip-bot for H. Peter Anvin
2016-06-08  5:09   ` [PATCH 04/10] " Andy Lutomirski
2016-06-08 19:29     ` H. Peter Anvin
2016-06-08 19:34       ` H. Peter Anvin
2016-06-08 19:35         ` Borislav Petkov
2016-06-07 23:31 ` [PATCH 05/10] x86, asm: change GEN_*_RMWcc() to use CC_SET()/CC_OUT() H. Peter Anvin
2016-06-07 23:41   ` [tip:x86/asm] " tip-bot for H. Peter Anvin
2016-06-07 23:31 ` [PATCH 06/10] x86, asm: Use CC_SET()/CC_OUT() in <asm/bitops.h> H. Peter Anvin
2016-06-07 23:41   ` [tip:x86/asm] " tip-bot for H. Peter Anvin
2016-06-07 23:31 ` [PATCH 07/10] x86, asm: Use CC_SET()/CC_OUT() in <asm/percpu.h> H. Peter Anvin
2016-06-07 23:42   ` [tip:x86/asm] " tip-bot for H. Peter Anvin
2016-06-07 23:31 ` [PATCH 08/10] x86, asm: Use CC_SET()/CC_OUT() in <asm/rwsem.h> H. Peter Anvin
2016-06-07 23:42   ` [tip:x86/asm] " tip-bot for H. Peter Anvin
2016-06-07 23:31 ` [PATCH 09/10] x86, asm: Use CC_SET()/CC_OUT() and static_cpu_has() in archrandom.h H. Peter Anvin
2016-06-07 23:42   ` [tip:x86/asm] " tip-bot for H. Peter Anvin
2016-06-08  5:12   ` [PATCH 09/10] " Andy Lutomirski
2016-06-07 23:31 ` [PATCH 10/10] x86, asm, boot: Use CC_SET()/CC_OUT() in arch/x86/boot/boot.h H. Peter Anvin
2016-06-07 23:43   ` [tip:x86/asm] " tip-bot for H. Peter Anvin
2016-06-08  8:00 ` [PATCH 00/10] x86: use gcc 6+ asm flag output feature Peter Zijlstra
2016-06-08  8:56   ` H. Peter Anvin
2016-06-08  8:26 ` Ingo Molnar

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