linux-kernel - RE: [PATCH v2 UPDATE 3/3] ACPI/APEI/EINJ: Allow memory error injection to NVDIMM

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Message-ID: <3908561D78D1C84285E8C5FCA982C28F32B5F6D2@ORSMSX114.amr.corp.intel.com>
Date:	Mon, 26 Oct 2015 16:46:28 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Toshi Kani <toshi.kani@....com>, "bp@...en8.de" <bp@...en8.de>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"Williams, Dan J" <dan.j.williams@...el.com>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 UPDATE 3/3] ACPI/APEI/EINJ: Allow memory error
 injection to NVDIMM

> +           ((param2 & PAGE_MASK) != PAGE_MASK))
>                return -EINVAL;
>
> The 3rd condition check makes sure that the param2 mask is the page size or less.  So, I
> think we are OK on this.

Oops. The original was even on the screen as part of the diff (which I signed off on just two years ago).

I'd be happier if you made it the 1st condition though, so we skip calling region_intersects_*() with
a nonsense "size" argument.

-Tony