linux-kernel - [PATCH, RFC 2/6] mm: make clear_huge

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Message-Id: <1342788622-10290-3-git-send-email-kirill.shutemov@linux.intel.com>
Date:	Fri, 20 Jul 2012 15:50:18 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	linux-mm@...ck.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Andi Kleen <ak@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Alex Shi <alex.shu@...el.com>,
	Jan Beulich <jbeulich@...ell.com>,
	Robert Richter <robert.richter@....com>,
	Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org
Subject: [PATCH, RFC 2/6] mm: make clear_huge_page tolerate non aligned address

From: Andi Kleen <ak@...ux.intel.com>

hugetlb does not necessarily pass in an aligned address, so the
low level address computation is wrong.

This will fix architectures that actually use the address for flushing
the cleared address (very few, like xtensa/sparc/...?)

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 mm/memory.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 2466d12..c356ead 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3975,16 +3975,17 @@ void clear_huge_page(struct page *page,
 		     unsigned long addr, unsigned int pages_per_huge_page)
 {
 	int i;
+	unsigned long haddr = addr & HPAGE_PMD_MASK;
 
 	if (unlikely(pages_per_huge_page > MAX_ORDER_NR_PAGES)) {
-		clear_gigantic_page(page, addr, pages_per_huge_page);
+		clear_gigantic_page(page, haddr, pages_per_huge_page);
 		return;
 	}
 
 	might_sleep();
 	for (i = 0; i < pages_per_huge_page; i++) {
 		cond_resched();
-		clear_user_highpage(page + i, addr + i * PAGE_SIZE);
+		clear_user_highpage(page + i, haddr + i * PAGE_SIZE);
 	}
 }
 
-- 
1.7.7.6

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