linux-kernel - [RFC PATCH 1/7] mm: Change __get_vm_area_node() to use fls

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Message-Id: <1422314009-31667-2-git-send-email-toshi.kani@hp.com>
Date:	Mon, 26 Jan 2015 16:13:23 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	akpm@...ux-foundation.org, hpa@...or.com, tglx@...utronix.de,
	mingo@...hat.com, arnd@...db.de, linux-mm@...ck.org
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Toshi Kani <toshi.kani@...com>
Subject: [RFC PATCH 1/7] mm: Change __get_vm_area_node() to use fls_long()

__get_vm_area_node() takes unsigned long size, which is a 64-bit
value on a 64-bit kernel.  However, fls(size) simply ignores the
upper 32-bit.  Change to use fls_long() to handle the size properly.

Signed-off-by: Toshi Kani <toshi.kani@...com>
---
 mm/vmalloc.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 39c3388..830a4be 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -29,6 +29,7 @@
 #include <linux/atomic.h>
 #include <linux/compiler.h>
 #include <linux/llist.h>
+#include <linux/bitops.h>
 
 #include <asm/uaccess.h>
 #include <asm/tlbflush.h>
@@ -1314,7 +1315,8 @@ static struct vm_struct *__get_vm_area_node(unsigned long size,
 
 	BUG_ON(in_interrupt());
 	if (flags & VM_IOREMAP)
-		align = 1ul << clamp(fls(size), PAGE_SHIFT, IOREMAP_MAX_ORDER);
+		align = 1ul << clamp((int)fls_long(size),
+				     PAGE_SHIFT, IOREMAP_MAX_ORDER);
 
 	size = PAGE_ALIGN(size);
 	if (unlikely(!size))
--
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