linux-kernel - Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning

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Message-ID: <49677A0E.3090709@zytor.com>
Date:	Fri, 09 Jan 2009 08:23:42 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	Chris Mason <chris.mason@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	paulmck@...ux.vnet.ibm.com, Gregory Haskins <ghaskins@...ell.com>,
	Matthew Wilcox <matthew@....cx>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <npiggin@...e.de>,
	Peter Morreale <pmorreale@...ell.com>,
	Sven Dietrich <SDietrich@...ell.com>
Subject: Re: [PATCH -v7][RFC]: mutex: implement adaptive spinning

Linus Torvalds wrote:
> 
> On Fri, 9 Jan 2009, Ingo Molnar wrote:
>>  
>> -static inline int constant_test_bit(int nr, const volatile unsigned long *addr)
>> +static __asm_inline int
>> +constant_test_bit(int nr, const volatile unsigned long *addr)
>>  {
>>  	return ((1UL << (nr % BITS_PER_LONG)) &
>>  		(((unsigned long *)addr)[nr / BITS_PER_LONG])) != 0;
> 
> Thios makes absolutely no sense.
> 
> It's called "__always_inline", not __asm_inline.
> 
> Why add a new nonsensical annotations like that?
> 

__asm_inline was my suggestion, to distinguish "inline this
unconditionally because gcc screws up in the presence of asm()" versus
"inline this unconditionally because the world ends if it isn't" -- to
tell the human reader, not gcc.  I guess the above is a good indicator
that the __asm_inline might have been a bad name.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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