linux-kernel - Re: [PATCH] x86: Change x86 to use generic find_next

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Date:	Sun, 09 Mar 2008 21:31:44 +0100
From:	"Alexander van Heukelum" <heukelum@...tmail.fm>
To:	"Ingo Molnar" <mingo@...e.hu>,
	"Alexander van Heukelum" <heukelum@...lshack.com>
Cc:	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"LKML" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Change x86 to use generic find_next_bit


On Sun, 9 Mar 2008 21:11:52 +0100, "Ingo Molnar" <mingo@...e.hu> said:
> * Alexander van Heukelum <heukelum@...lshack.com> wrote:
> > --- a/lib/find_next_bit.c
> > +++ b/lib/find_next_bit.c
> > @@ -15,6 +15,8 @@
> >  #include <asm/byteorder.h>
> >  
> >  #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.

Greetings,
    Alexander

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