linux-kernel - RE: [PATCH v8 09/10] x86, mpx: cleanup unused bound tables

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Message-ID: <9E0BE1322F2F2246BD820DA9FC397ADE017A4015@shsmsx102.ccr.corp.intel.com>
Date:	Fri, 12 Sep 2014 03:02:38 +0000
From:	"Ren, Qiaowei" <qiaowei.ren@...el.com>
To:	"Hansen, Dave" <dave.hansen@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
CC:	"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 09/10] x86, mpx: cleanup unused bound tables



On 2014-09-11, Hansen, Dave wrote:
> On 09/11/2014 01:46 AM, Qiaowei Ren wrote:
>> + * This function will be called by do_munmap(), and the VMAs
>> + covering
>> + * the virtual address region start...end have already been split
>> + if
>> + * necessary and remvoed from the VMA list.
> 
> "remvoed" -> "removed"
> 
>> +void mpx_unmap(struct mm_struct *mm,
>> +		unsigned long start, unsigned long end) {
>> +	int ret;
>> +
>> +	ret = mpx_try_unmap(mm, start, end);
>> +	if (ret == -EINVAL)
>> +		force_sig(SIGSEGV, current);
>> +}
> 
> In the case of a fault during an unmap, this just ignores the
> situation and returns silently.  Where is the code to retry the
> freeing operation outside of mmap_sem?

Dave, you mean delayed_work code? According to our discussion, it will be deferred to another mainline post.

Thanks,
Qiaowei

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