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From: Ingo Molnar <mingo@elte.hu>
To: Alexander van Heukelum <heukelum@fastmail.fm>
Cc: Alexander van Heukelum <heukelum@mailshack.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86: Change x86 to use generic find_next_bit
Date: Sun, 9 Mar 2008 21:51:32 +0100	[thread overview]
Message-ID: <20080309205132.GA9021@elte.hu> (raw)
In-Reply-To: <1205094704.6430.1241420859@webmail.messagingengine.com>


* Alexander van Heukelum <heukelum@fastmail.fm> wrote:

> > >  #define BITOP_WORD(nr)		((nr) / BITS_PER_LONG)
> > > +#undef find_next_bit
> > > +#undef find_next_zero_bit
> > 
> > this bit looks weird - did you need it for testing?
> 
> Worse, it's needed to get x86_64 to compile.
> 
> They are defined in include/asm-x86/bitops_64.h (which gets included). 
> They are used to optimize the case where the bitmap size is known at 
> compile time and not larger than BITS_PER_LONG. Undeffing them here is 
> the easiest way to get things to compile, here.

ok - but this needs to be solved in a cleaner way. That build-time 
optimization needs to be pushed into generic code so that 32-bit x86 and 
other architectures can make use of it as well. The lib/find_next_bit.c 
functions should be named __find_next_bit() or so.

	Ingo

  reply	other threads:[~2008-03-09 20:51 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-09 20:01 [PATCH] x86: Change x86 to use generic find_next_bit Alexander van Heukelum
2008-03-09 20:10 ` Ingo Molnar
2008-03-09 21:03   ` Andi Kleen
2008-03-09 21:32     ` Andi Kleen
2008-03-09 21:13   ` Alexander van Heukelum
2008-03-10  6:29     ` Ingo Molnar
2008-03-09 20:11 ` Ingo Molnar
2008-03-09 20:31   ` Alexander van Heukelum
2008-03-09 20:51     ` Ingo Molnar [this message]
2008-03-09 21:29       ` Andi Kleen
2008-03-10 23:17       ` [RFC/PATCH] x86: Optimize find_next_(zero_)bit for small constant-size bitmaps Alexander van Heukelum
2008-03-11  9:56         ` Ingo Molnar
2008-03-11 15:17           ` [PATCH] " Alexander van Heukelum
2008-03-11 15:22             ` [RFC] non-x86: " Alexander van Heukelum
2008-03-11 15:23             ` [PATCH] x86: " Ingo Molnar
2008-03-09 20:28 ` [PATCH] x86: Change x86 to use generic find_next_bit Andi Kleen
2008-03-09 21:31 ` Andi Kleen
2008-03-13 12:44 ` Aneesh Kumar K.V
2008-03-13 14:27   ` Alexander van Heukelum

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