From: Jes Sorensen <jes@sgi.com>
Date: Wed, 25 Oct 2006 09:49:53 +0000 (-0400)
Subject: [IA64] don't double >> PAGE_SHIFT pointer for /dev/kmem access
X-Git-Tag: v2.6.19-rc5~88^2~4
X-Git-Url: http://bbs.cooldavid.org/git/?a=commitdiff_plain;h=f2454a1a4b2aca38d3b7887619f43291d773c1ee;p=net-next-2.6.git

[IA64] don't double >> PAGE_SHIFT pointer for /dev/kmem access

Don't PAGE_SHIFT pointer before handing it to virt_to_page() in
xlate_dev_kmem_ptr() as it results in a double shift.

Spotted by Bob Montgomery.

Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
---

diff --git a/include/asm-ia64/uaccess.h b/include/asm-ia64/uaccess.h
index 9adb51211c2..449c8c0fa2b 100644
--- a/include/asm-ia64/uaccess.h
+++ b/include/asm-ia64/uaccess.h
@@ -389,7 +389,7 @@ xlate_dev_kmem_ptr (char * p)
 	struct page *page;
 	char * ptr;
 
-	page = virt_to_page((unsigned long)p >> PAGE_SHIFT);
+	page = virt_to_page((unsigned long)p);
 	if (PageUncached(page))
 		ptr = (char *)__pa(p) + __IA64_UNCACHED_OFFSET;
 	else