[PATCH v2 1/2] lib/raid: use kvmalloc() in calibrate_xor_blocks()

The xor benchmark allocates an order 2 (4 pages) scratch buffer that is
used purely as a CPU-only XOR working area.

This buffer does not need to be physically contiguous and can be
allocated with kvmalloc().

Replace __get_free_pages() call with kvmalloc().

Link: https://lore.kernel.org/all/[email protected]
Signed-off-by: Mike Rapoport (Microsoft) <[email protected]>
---
 lib/raid/xor/xor-core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/raid/xor/xor-core.c b/lib/raid/xor/xor-core.c
index bd4e6e434418..9f90620617cd 100644
--- a/lib/raid/xor/xor-core.c
+++ b/lib/raid/xor/xor-core.c
@@ -8,6 +8,7 @@
 
 #include <linux/module.h>
 #include <linux/gfp.h>
+#include <linux/slab.h>
 #include <linux/raid/xor.h>
 #include <linux/jiffies.h>
 #include <linux/preempt.h>
@@ -114,7 +115,7 @@ static int __init calibrate_xor_blocks(void)
 	if (forced_template)
 		return 0;
 
-	b1 = (void *) __get_free_pages(GFP_KERNEL, 2);
+	b1 = kvmalloc(PAGE_SIZE * 4, GFP_KERNEL);
 	if (!b1) {
 		pr_warn("xor: Yikes!  No memory available.\n");
 		return -ENOMEM;
@@ -132,7 +133,7 @@ static int __init calibrate_xor_blocks(void)
 	pr_info("xor: using function: %s (%d MB/sec)\n",
 	       fastest->name, fastest->speed);
 
-	free_pages((unsigned long)b1, 2);
+	kvfree(b1);
 	return 0;
 }
 

-- 
2.53.0