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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>
This commit is contained in:
NeilBrown 2013-02-28 09:08:34 +11:00
parent ee0b024403
commit 51acbcec6c
2 changed files with 1 additions and 48 deletions
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11
drivers/md/Kconfig
View File

@ -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

38
drivers/md/raid5.c
View File

@ -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);