linux-kernel - [PATCH] hugetlb: call mmu notifiers on hugepage cow

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Message-ID: <4BFED954.8060807@cray.com>
Date:	Thu, 27 May 2010 13:43:00 -0700
From:	Doug Doan <dougd@...y.com>
To:	linux-mm@...ck.org
CC:	linux-kernel@...r.kernel.org, andi@...stfloor.org,
	lee.schermerhorn@...com, rientjes@...gle.com, mel@....ul.ie,
	akpm@...ux-foundation.org
Subject: [PATCH] hugetlb: call mmu notifiers on hugepage cow

From: Doug Doan <dougd@...y.com>

When a copy-on-write occurs, we take one of two paths in handle_mm_fault: 
through handle_pte_fault for normal pages, or through hugetlb_fault for huge pages.

In the normal page case, we eventually get to do_wp_page and call mmu notifiers 
via ptep_clear_flush_notify. There is no callout to the mmmu notifiers in the 
huge page case. This patch fixes that.

Signed-off-by: Doug Doan <dougd@...y.com>
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