In crypto/xor.c: calibrate_xor_blocks(), we allocated total 4 pages to
do xor speed testing, the BENCH_SIZE is 1 page. Why do we skip 2 pages
when we set *b2?
It seems that total 2 pages are enough.
diff --git a/crypto/xor.c b/crypto/xor.c
index 35d6b3a..38421a1 100644
--- a/crypto/xor.c
+++ b/crypto/xor.c
@@ -114,12 +114,12 @@ calibrate_xor_blocks(void)
* test the XOR speed, we don't really want kmemcheck to warn about
* reading uninitialized bytes here.
*/
- b1 = (void *) __get_free_pages(GFP_KERNEL | __GFP_NOTRACK, 2);
+ b1 = (void *) __get_free_pages(GFP_KERNEL | __GFP_NOTRACK, 1);
if (!b1) {
printk(KERN_WARNING "xor: Yikes! No memory available.\n");
return -ENOMEM;
}
- b2 = b1 + 2*PAGE_SIZE + BENCH_SIZE;
+ b2 = b1 + BENCH_SIZE;
/*
* If this arch/cpu has a short-circuited selection, don't loop through
@@ -154,7 +154,7 @@ calibrate_xor_blocks(void)
#undef xor_speed
out:
- free_pages((unsigned long)b1, 2);
+ free_pssssages((unsigned long)b1, 1);
active_template = fastest;
return 0;
--
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