linux-kernel - Re: [PATCH] Introduce ext4_find_next

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Date:	Wed, 14 Nov 2007 00:41:03 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Introduce ext4_find_next_bit



Andrew Morton wrote:
> On Fri, 21 Sep 2007 10:55:05 +0530 "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:
> 
>> Also add generic_find_next_le_bit
>>
>> This gets used by the ext4 multi block allocator patches.
>>
> 
> arm allmodconfig:
> 
> fs/ext4/mballoc.c: In function `ext4_mb_generate_buddy':
> fs/ext4/mballoc.c:836: error: implicit declaration of function `ext2_find_next_bit'
> 
> This patch makes my head spin.
> 
> Why did we declare generic_find_next_le_bit() in
> include/asm-powerpc/bitops.h (wrong) as well as in
> include/asm-generic/bitops/le.h (presumably correct)?
> 

I was following the coding style used for rest of the APIs
like ext4_set_bit.


> Why is it touching a powerpc file and no any other architectures? 
> Something screwed up in powerpc land?
> 
> And why did arm break?

arm and below list of arch doesn't include the asm-generic/bitops/ext2-non-atomic.h 

I did a grep and that list the below architectures as also affected.
arm, m68k, m68knommu, s390

> 
> Shudder.  Anyway, please fix, and if that fix requires that various
> braindamaged be repaired, please repair the braindamage rather than going
> along with it.
> 
> 

That should be a separate patch altogether. I wanted to do the cleanup
along with the usages such as but never got time to do the same.

#define ocfs2_set_bit ext2_set_bit
#define udf_set_bit(nr,addr) ext2_set_bit(nr,addr)
direct usage in mb
md/bitmap.c +799
md/dm-log.c +177

I will send a patch tomorrow that fix  arm and other architectures. I guess the cleanup
can be a separate patch ? 

-aneesh


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