linux-kernel - [PATCH resend] rmap: recompute pgoff for unmapping huge page

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Message-ID: <CAJd=RBD0UWxpMv7W78fH0U_zBAOozP1owaMePGaUEVitotRfBg@mail.gmail.com>
Date:	Mon, 4 Mar 2013 20:47:31 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Linux-MM <linux-mm@...ck.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Michal Hocko <mhocko@...e.cz>,
	Michel Lespinasse <walken@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hillf Danton <dhillf@...il.com>
Subject: [PATCH resend] rmap: recompute pgoff for unmapping huge page

[Resend due to error in delivering to linux-kernel@...r.kernel.org,
caused probably by the rich format provided by the mail agent by default.]

We have to recompute pgoff if the given page is huge, since result based on
HPAGE_SIZE is not approapriate for scanning the vma interval tree, as shown
by commit 36e4f20af833(hugetlb: do not use vma_hugecache_offset() for
vma_prio_tree_foreach)

Signed-off-by: Hillf Danton <dhillf@...il.com>
---

--- a/mm/rmap.c	Mon Mar  4 20:00:00 2013
+++ b/mm/rmap.c	Mon Mar  4 20:02:16 2013
@@ -1513,6 +1513,9 @@ static int try_to_unmap_file(struct page
 	unsigned long max_nl_size = 0;
 	unsigned int mapcount;

+	if (PageHuge(page))
+		pgoff = page->index << compound_order(page);
+
 	mutex_lock(&mapping->i_mmap_mutex);
 	vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
 		unsigned long address = vma_address(page, vma);
--
--
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