md: Fix userspace free_pages() macro

rostedt · neilbrown · commit 38059ec2bd2c · 2011-12-23T10:17:51.000+11:00
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.

Acked-by: H. Peter Anvin &lt;hpa@zytor.com&gt;
Signed-off-by: Steven Rostedt &lt;rostedt@goodmis.org&gt;
Signed-off-by: NeilBrown &lt;neilb@suse.de&gt;
diff --git 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)
 {

Original file line number	Diff line number	Diff line change
`@@ -132,7 +132,7 @@ void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,`
`132`	`132`	`PROT_READ\|PROT_WRITE, \`
`133`	`133`	`MAP_PRIVATE\|MAP_ANONYMOUS,\`
`134`	`134`	`0, 0))`
`135`		`-# define free_pages(x, y) munmap((void )(x), (y)PAGE_SIZE)`
	`135`	`+# define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y))`
`136`	`136`
`137`	`137`	`static inline void cpu_relax(void)`
`138`	`138`	`{`