linux-kernel - Re: [PATCH v2] arch: arm64: kernel: add '#ifdef CONFIG_COMPAT' for aarch32_break

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Date:	Mon, 24 Jun 2013 18:16:08 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Will Deacon <will.deacon@....com>
CC:	Catalin Marinas <Catalin.Marinas@....com>,
	Tony Lindgren <tony@...mide.com>,
	"olof@...om.net" <olof@...om.net>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v2] arch: arm64: kernel: add '#ifdef CONFIG_COMPAT' for
 aarch32_break_handler()

On 06/24/2013 06:14 PM, Will Deacon wrote:
> On Mon, Jun 24, 2013 at 10:27:49AM +0100, Chen Gang wrote:
>> > 
>> > If 'COMPAT' not defined, aarch32_break_handler() cannot pass compiling,
>> > and it can work independent with 'COMPAT', so remove dummy definition.
>> > 
>> > The related make:
>> > 
>> >   make ARCH=arm64 randconfig
>> >   make ARCH=arm64 menuconfig
>> >   make ARCH=arm64 V=1 EXTRA_CFLAGS=-W
> This sequence isn't really very useful, so I wouldn't bother including it in
> the commit message. You can trigger this issue just by disabling
> CONFIG_COMPAT.
> 

OK, thanks. Next time, I need notice about it.

>> > The related error:
>> > 
>> >   arch/arm64/kernel/debug-monitors.c:249:5: error: redefinition of ‘aarch32_break_handler’
>> >   In file included from arch/arm64/kernel/debug-monitors.c:29:0:
>> >   /root/linux-next/arch/arm64/include/asm/debug-monitors.h:89:12: note: previous definition of ‘aarch32_break_handler’ was here
>> > 
>> > 
>> > 
>> > Signed-off-by: Chen Gang <gang.chen@...anux.com>
>> > ---
>> >  arch/arm64/include/asm/debug-monitors.h |    7 -------
>> >  1 files changed, 0 insertions(+), 7 deletions(-)
>> > 
>> > diff --git a/arch/arm64/include/asm/debug-monitors.h b/arch/arm64/include/asm/debug-monitors.h
>> > index ef8235c..a2232d0 100644
>> > --- a/arch/arm64/include/asm/debug-monitors.h
>> > +++ b/arch/arm64/include/asm/debug-monitors.h
>> > @@ -83,14 +83,7 @@ static inline int reinstall_suspended_bps(struct pt_regs *regs)
>> >  }
>> >  #endif
>> >  
>> > -#ifdef CONFIG_COMPAT
>> >  int aarch32_break_handler(struct pt_regs *regs);
>> > -#else
>> > -static int aarch32_break_handler(struct pt_regs *regs)
>> > -{
>> > -	return -EFAULT;
>> > -}
>> > -#endif
> Code looks fine to me:
> 
>   Acked-by: Will Deacon <will.deacon@....com>

Thanks.

-- 
Chen Gang

Asianux Corporation
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