linux-kernel - md: Fix userspace free

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Message-ID: <1323869678.23971.19.camel@gandalf.stny.rr.com>
Date:	Wed, 14 Dec 2011 08:34:38 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	NeilBrown <neilb@...e.de>, Dan Williams <dan.j.williams@...el.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: md: Fix userspace free_pages() macro

While using etags to find free_pages(), I stumbled across this debug
definition of free_pages() that is to be used while debugging some raid
code in userspace. The __get_free_pages() allocates the correct size,
but the free_pages() does not match. free_pages(), like
__get_free_pages(), takes an order and not a size.

Signed-off-by: Steven Rostedt <rostedt@...dmis.org>

diff --git a/include/linux/raid/pq.h b/include/linux/raid/pq.h
index 2b59cc8..53272e9 100644
--- a/include/linux/raid/pq.h
+++ b/include/linux/raid/pq.h
@@ -132,7 +132,7 @@ void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
 						     PROT_READ|PROT_WRITE,   \
 						     MAP_PRIVATE|MAP_ANONYMOUS,\
 						     0, 0))
-# define free_pages(x, y)	munmap((void *)(x), (y)*PAGE_SIZE)
+# define free_pages(x, y)	munmap((void *)(x), PAGE_SIZE << (y))
 
 static inline void cpu_relax(void)
 {


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