linux-kernel - Re: x86: ppc fixes for find_first

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Date:	Mon, 14 Apr 2008 18:48:39 +0200
From:	"Alexander van Heukelum" <heukelum@...tmail.fm>
To:	"Thomas Gleixner" <tglx@...utronix.de>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Alexander van Heukelum" <heukelum@...lshack.com>,
	linux-kernel@...r.kernel.org
Subject: Re: x86: ppc fixes for find_first_bit

Hello Thomas,

I see Ingo has applied three fixes to the x86-tree:
    find_first_bit() ppc fix
    powerpc: fix powerpc build
    find_next_bit() fix

Could you please give some insight in what went wrong with
ppc and powerpc?

"find_first_bit() ppc fix" disables the use of find_first_bit
for every user of GENERIC_FIND_NEXT_BIT=y. It replaces it by a
macro to call find_next_bit with offset=0. It should be possible
for an arch to use GENERIC_FIND_NEXT_BIT=y and implement 
find_first_bit by itself.

"powerpc: fix powerpc build" removes the private 'implementation'
of asm-generic/bitops/find.h. It seems correct code to me. What
was the problem here? If it is duplicate declarations, then
I would suggest putting #ifndef GENERIC_FIND_NEXT_BIT around
them.

"find_next_bit() fix" changes asm-generic/bitops/find.h to
declare find_next_bit only if CONFIG_GENERIC_FIND_NEXT_BIT=n.
That is indeed a good change. It would be better if this
file disappeared completely, though.

Greetings,
    Alexander
-- 
  Alexander van Heukelum
  heukelum@...tmail.fm

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