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md: use list_for_each_entry macro directly

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The rdev_for_each macro defined in <linux/raid/md_k.h> is identical to
list_for_each_entry_safe, from <linux/list.h>, it should be defined to
use list_for_each_entry_safe, instead of reinventing the wheel.

But some calls to each_entry_safe don't really need a safe version,
just a direct list_for_each_entry is enough, this could save a temp
variable (tmp) in every function that used rdev_for_each.

In this patch, most rdev_for_each loops are replaced by list_for_each_entry,
totally save many tmp vars; and only in the other situations that will call
list_del to delete an entry, the safe version is used.

Signed-off-by: Cheng Renquan <crquan@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
Cheng Renquan
2009-01-09 08:31:08 +11:00
committed by NeilBrown
parent ccacc7d2cf
commit 159ec1fc06
10 changed files with 60 additions and 94 deletions
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8
drivers/md/raid5.c
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@ -3998,7 +3998,6 @@ static int run(mddev_t *mddev)
int raid_disk, memory;
mdk_rdev_t *rdev;
struct disk_info *disk;
struct list_head *tmp;
int working_disks = 0;
if (mddev->level != 5 && mddev->level != 4 && mddev->level != 6) {
@ -4108,7 +4107,7 @@ static int run(mddev_t *mddev)
pr_debug("raid5: run(%s) called.\n", mdname(mddev));
rdev_for_each(rdev, tmp, mddev) {
list_for_each_entry(rdev, &mddev->disks, same_set) {
raid_disk = rdev->raid_disk;
if (raid_disk >= conf->raid_disks
|| raid_disk < 0)
@ -4533,7 +4532,6 @@ static int raid5_start_reshape(mddev_t *mddev)
{
raid5_conf_t *conf = mddev_to_conf(mddev);
mdk_rdev_t *rdev;
struct list_head *rtmp;
int spares = 0;
int added_devices = 0;
unsigned long flags;
@ -4541,7 +4539,7 @@ static int raid5_start_reshape(mddev_t *mddev)
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
return -EBUSY;
rdev_for_each(rdev, rtmp, mddev)
list_for_each_entry(rdev, &mddev->disks, same_set)
if (rdev->raid_disk < 0 &&
!test_bit(Faulty, &rdev->flags))
spares++;
@ -4563,7 +4561,7 @@ static int raid5_start_reshape(mddev_t *mddev)
/* Add some new drives, as many as will fit.
* We know there are enough to make the newly sized array work.
*/
rdev_for_each(rdev, rtmp, mddev)
list_for_each_entry(rdev, &mddev->disks, same_set)
if (rdev->raid_disk < 0 &&
!test_bit(Faulty, &rdev->flags)) {
if (raid5_add_disk(mddev, rdev) == 0) {