Commit 51acbcec authored by NeilBrown's avatar NeilBrown
Browse files

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: default avatarNeilBrown <neilb@suse.de>
parent ee0b0244

drivers/md/Kconfig

+0 −11
Original line number Diff line number Diff line
@@ -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

drivers/md/raid5.c

+1 −37
Original line number Diff line number Diff line
@@ -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);

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