summaryrefslogtreecommitdiffstats
path: root/crypto/xor.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2012-05-23 17:08:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-23 17:08:40 -0700
commitc80ddb526331a72c9e9d1480f85f6fd7c74e3d2d (patch)
tree0212803a009f171990032abb94fad84156baa153 /crypto/xor.c
parent2c13bc0f8f0d3e13b42be70bf74fec8e56b58324 (diff)
parent1dff2b87a34a1ac1d1898ea109bf97ed396aca53 (diff)
downloadlinux-c80ddb526331a72c9e9d1480f85f6fd7c74e3d2d.tar.bz2
Merge tag 'md-3.5' of git://neil.brown.name/md
Pull md updates from NeilBrown: "It's been a busy cycle for md - lots of fun stuff here.. if you like this kind of thing :-) Main features: - RAID10 arrays can be reshaped - adding and removing devices and changing chunks (not 'far' array though) - allow RAID5 arrays to be reshaped with a backup file (not tested yet, but the priciple works fine for RAID10). - arrays can be reshaped while a bitmap is present - you no longer need to remove it first - SSSE3 support for RAID6 syndrome calculations and of course a number of minor fixes etc." * tag 'md-3.5' of git://neil.brown.name/md: (56 commits) md/bitmap: record the space available for the bitmap in the superblock. md/raid10: Remove extras after reshape to smaller number of devices. md/raid5: improve removal of extra devices after reshape. md: check the return of mddev_find() MD RAID1: Further conditionalize 'fullsync' DM RAID: Use md_error() in place of simply setting Faulty bit DM RAID: Record and handle missing devices DM RAID: Set recovery flags on resume md/raid5: Allow reshape while a bitmap is present. md/raid10: resize bitmap when required during reshape. md: allow array to be resized while bitmap is present. md/bitmap: make sure reshape request are reflected in superblock. md/bitmap: add bitmap_resize function to allow bitmap resizing. md/bitmap: use DIV_ROUND_UP instead of open-code md/bitmap: create a 'struct bitmap_counts' substructure of 'struct bitmap' md/bitmap: make bitmap bitops atomic. md/bitmap: make _page_attr bitops atomic. md/bitmap: merge bitmap_file_unmap and bitmap_file_put. md/bitmap: remove async freeing of bitmap file. md/bitmap: convert some spin_lock_irqsave to spin_lock_irq ...
Diffstat (limited to 'crypto/xor.c')
-rw-r--r--crypto/xor.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/crypto/xor.c b/crypto/xor.c
index 664b6dfa9e2c..65c7b416b4a3 100644
--- a/crypto/xor.c
+++ b/crypto/xor.c
@@ -21,6 +21,7 @@
#include <linux/gfp.h>
#include <linux/raid/xor.h>
#include <linux/jiffies.h>
+#include <linux/preempt.h>
#include <asm/xor.h>
/* The xor routines to use. */
@@ -63,12 +64,14 @@ static void
do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2)
{
int speed;
- unsigned long now;
+ unsigned long now, j;
int i, count, max;
tmpl->next = template_list;
template_list = tmpl;
+ preempt_disable();
+
/*
* Count the number of XORs done during a whole jiffy, and use
* this to calculate the speed of checksumming. We use a 2-page
@@ -76,9 +79,11 @@ do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2)
*/
max = 0;
for (i = 0; i < 5; i++) {
- now = jiffies;
+ j = jiffies;
count = 0;
- while (jiffies == now) {
+ while ((now = jiffies) == j)
+ cpu_relax();
+ while (time_before(jiffies, now + 1)) {
mb(); /* prevent loop optimzation */
tmpl->do_2(BENCH_SIZE, b1, b2);
mb();
@@ -89,6 +94,8 @@ do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2)
max = count;
}
+ preempt_enable();
+
speed = max * (HZ * BENCH_SIZE / 1024);
tmpl->speed = speed;