linux-kernel - RE: [PATCH v8 06/10] mips: sync struct siginfo with general version

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Date:	Fri, 12 Sep 2014 02:54:55 +0000
From:	"Ren, Qiaowei" <qiaowei.ren@...el.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	"Hansen, Dave" <dave.hansen@...el.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v8 06/10] mips: sync struct siginfo with general version



On 2014-09-12, Thomas Gleixner wrote:
> On Thu, 11 Sep 2014, Qiaowei Ren wrote:
> 
>> Due to new fields about bound violation added into struct siginfo,
>> this patch syncs it with general version to avoid build issue.
> 
> You completely fail to explain which build issue is addressed by this
> patch. The code you added to kernel/signal.c which accesses _addr_bnd
> is guarded by
> 
> +#ifdef SEGV_BNDERR
> 
> which is not defined my MIPS. Also why is this only affecting MIPS and
> not any other architecture which provides its own struct siginfo ?
> 
> That patch makes no sense at all, at least not without a proper explanation.
>

For arch=mips, siginfo.h (arch/mips/include/uapi/asm/siginfo.h) will include general siginfo.h, and only replace general stuct siginfo with mips specific struct siginfo. So SEGV_BNDERR will be defined for all archs, and we will get error like "no _lower in struct siginfo" when arch=mips.

In addition, only MIPS arch define its own struct siginfo, so this is only affecting MIPS. 

Thanks,
Qiaowei

> 
>> Signed-off-by: Qiaowei Ren <qiaowei.ren@...el.com>
>> ---
>>  arch/mips/include/uapi/asm/siginfo.h |    4 ++++
>>  1 files changed, 4 insertions(+), 0 deletions(-)
>> diff --git a/arch/mips/include/uapi/asm/siginfo.h
>> b/arch/mips/include/uapi/asm/siginfo.h
>> index e811744..d08f83f 100644
>> --- a/arch/mips/include/uapi/asm/siginfo.h
>> +++ b/arch/mips/include/uapi/asm/siginfo.h
>> @@ -92,6 +92,10 @@ typedef struct siginfo {
>>  			int _trapno;	/* TRAP # which caused the signal */
>>  #endif
>>  			short _addr_lsb;
>> +			struct {
>> +				void __user *_lower;
>> +				void __user *_upper;
>> +			} _addr_bnd;
>>  		} _sigfault;
>>  
>>  		/* SIGPOLL, SIGXFSZ (To do ...)	 */
>> --
>> 1.7.1
>> 
>>
--
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