linux-kernel - Re: [PATCH v9 11/12] x86, mpx: cleanup unused bound tables

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Message-ID: <545BED0B.8000001@intel.com>
Date:	Thu, 06 Nov 2014 13:50:03 -0800
From:	Dave Hansen <dave.hansen@...el.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Qiaowei Ren <qiaowei.ren@...el.com>
CC:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-ia64@...r.kernel.org, linux-mips@...ux-mips.org
Subject: Re: [PATCH v9 11/12] x86, mpx: cleanup unused bound tables

Instead of all of these games with dropping and reacquiring mmap_sem and
adding other locks, or deferring the work, why don't we just do a
get_user_pages()?  Something along the lines of:

while (1) {
	ret = cmpxchg(addr)
	if (!ret)
		break;
	if (ret == -EFAULT)
		get_user_pages(addr);
}

Does anybody see a problem with that?
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