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authorNeilBrown <neilb@suse.de>2013-02-27 23:08:34 +0100
committerNeilBrown <neilb@suse.de>2013-02-27 23:08:34 +0100
commit51acbcec6c42b24482bac18e42befc822524535d (patch)
tree8677d949a7fb1d398b5ace9c5554e9e14a0c00d2 /drivers/md
parentmd/raid1,raid10: fix deadlock with freeze_array() (diff)
downloadlinux-51acbcec6c42b24482bac18e42befc822524535d.tar.xz
linux-51acbcec6c42b24482bac18e42befc822524535d.zip
md: remove CONFIG_MULTICORE_RAID456
This doesn't seem to actually help and we have an alternate multi-threading approach waiting in the wings, so just get rid of this config option and associated code. As a bonus, we remove one use of CONFIG_EXPERIMENTAL Cc: Dan Williams <djbw@fb.com> Cc: Kees Cook <keescook@chromium.org> Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/Kconfig11
-rw-r--r--drivers/md/raid5.c38
2 files changed, 1 insertions, 48 deletions
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 91a02eeeb319..9a10313d0670 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -154,17 +154,6 @@ config MD_RAID456
If unsure, say Y.
-config MULTICORE_RAID456
- bool "RAID-4/RAID-5/RAID-6 Multicore processing (EXPERIMENTAL)"
- depends on MD_RAID456
- depends on SMP
- depends on EXPERIMENTAL
- ---help---
- Enable the raid456 module to dispatch per-stripe raid operations to a
- thread pool.
-
- If unsure, say N.
-
config MD_MULTIPATH
tristate "Multipath I/O support"
depends on BLK_DEV_MD
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 19d77a026639..35031c8b2d02 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1406,7 +1406,7 @@ static void ops_run_check_pq(struct stripe_head *sh, struct raid5_percpu *percpu
&sh->ops.zero_sum_result, percpu->spare_page, &submit);
}
-static void __raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
+static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
{
int overlap_clear = 0, i, disks = sh->disks;
struct dma_async_tx_descriptor *tx = NULL;
@@ -1471,36 +1471,6 @@ static void __raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
put_cpu();
}
-#ifdef CONFIG_MULTICORE_RAID456
-static void async_run_ops(void *param, async_cookie_t cookie)
-{
- struct stripe_head *sh = param;
- unsigned long ops_request = sh->ops.request;
-
- clear_bit_unlock(STRIPE_OPS_REQ_PENDING, &sh->state);
- wake_up(&sh->ops.wait_for_ops);
-
- __raid_run_ops(sh, ops_request);
- release_stripe(sh);
-}
-
-static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
-{
- /* since handle_stripe can be called outside of raid5d context
- * we need to ensure sh->ops.request is de-staged before another
- * request arrives
- */
- wait_event(sh->ops.wait_for_ops,
- !test_and_set_bit_lock(STRIPE_OPS_REQ_PENDING, &sh->state));
- sh->ops.request = ops_request;
-
- atomic_inc(&sh->count);
- async_schedule(async_run_ops, sh);
-}
-#else
-#define raid_run_ops __raid_run_ops
-#endif
-
static int grow_one_stripe(struct r5conf *conf)
{
struct stripe_head *sh;
@@ -1509,9 +1479,6 @@ static int grow_one_stripe(struct r5conf *conf)
return 0;
sh->raid_conf = conf;
- #ifdef CONFIG_MULTICORE_RAID456
- init_waitqueue_head(&sh->ops.wait_for_ops);
- #endif
spin_lock_init(&sh->stripe_lock);
@@ -1630,9 +1597,6 @@ static int resize_stripes(struct r5conf *conf, int newsize)
break;
nsh->raid_conf = conf;
- #ifdef CONFIG_MULTICORE_RAID456
- init_waitqueue_head(&nsh->ops.wait_for_ops);
- #endif
spin_lock_init(&nsh->stripe_lock);
list_add(&nsh->lru, &newstripes);