linux-kernel - Re: [PATCH] unicore32: fix build error for find bitops

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Date:	Fri, 10 Jun 2011 11:13:47 +0800
From:	Guan Xuetao <gxt@...c.pku.edu.cn>
To:	Akinobu Mita <akinobu.mita@...il.com>
Cc:	arnd@...db.de, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, greg@...ah.com
Subject: Re: [PATCH] unicore32: fix build error for find bitops

On Thu, 2011-06-09 at 20:32 +0900, Akinobu Mita wrote:
> 2011/6/9 GuanXuetao <gxt@...c.pku.edu.cn>:
> > From: Guan Xuetao <gxt@...c.pku.edu.cn>
> >
> > Remove the __uc32_ prefix in find bitops functions.
> > see commit <19de85ef574c3a2182e3ccad9581805052f14946>
> >  bitops: add #ifndef for each of find bitops
> >
> > Signed-off-by: Guan Xuetao <gxt@...c.pku.edu.cn>
> > Cc: Akinobu Mita <akinobu.mita@...il.com>
> > ---
> >  arch/unicore32/include/asm/bitops.h |    6 ------
> >  arch/unicore32/kernel/ksyms.c       |    4 ++--
> >  arch/unicore32/lib/findbit.S        |   14 ++++++++------
> >  3 files changed, 10 insertions(+), 14 deletions(-)
> >
> > diff --git a/arch/unicore32/include/asm/bitops.h b/arch/unicore32/include/asm/bitops.h
> > index 1628a63..a9653f0 100644
> > --- a/arch/unicore32/include/asm/bitops.h
> > +++ b/arch/unicore32/include/asm/bitops.h
> > @@ -13,12 +13,6 @@
> >  #ifndef __UNICORE_BITOPS_H__
> >  #define __UNICORE_BITOPS_H__
> >
> > -#define find_next_bit          __uc32_find_next_bit
> > -#define find_next_zero_bit     __uc32_find_next_zero_bit
> > -
> > -#define find_first_bit         __uc32_find_first_bit
> > -#define find_first_zero_bit    __uc32_find_first_zero_bit
> > -
> 
> Is this patch really fix the build error?
> 
> If these find_*_bit macros are removed, vmlinux will have multiple
> definisions of find_*_bit. Because lib/find_next_bit.c is built
> unconditionally after the commit 63e424c84429903c92a0f1e9654c31ccaf6694d0
> ("arch: remove CONFIG_GENERIC_FIND_{NEXT_BIT,BIT_LE,LAST_BIT}".
Yes, the patch really 'eliminate' the build error.
However, when I checked binary code in vmlinux, it definitely uses the
functions in lib/find*.c, but not the assembly implementations in
arch/unicore32/lib/findbit.S.

Thanks & Regards,
Guan Xuetao



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