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

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Date:	Sat, 13 Sep 2014 07:13:02 +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 Fri, 12 Sep 2014, Ren, Qiaowei wrote:
>> 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.
> 
> So IA64 does not count as an architecture and therefor does not need
> the same treatment, right?
> 
struct siginfo for IA64 should be also synced. I will do this next post.

Thanks,
Qiaowei

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