On Tue, 26 Feb 2013 17:27:45 -0800 Dan Williams <djbw@xxxxxx> wrote:
> On Fri, Feb 22, 2013 at 11:40 PM, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> > The CONFIG_EXPERIMENTAL config item has not carried much meaning for a
> > while now and is almost always enabled by default. As agreed during the
> > Linux kernel summit, remove it from any "depends on" lines in Kconfigs.
> >
> > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> > Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
> > Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
> > Cc: Alasdair G Kergon <agk@xxxxxxxxxx>
> > ---
> > drivers/md/Kconfig | 1 -
> > 1 file changed, 1 deletion(-)
> >
> > diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
> > index 7cdf359..0cc3a3d 100644
> > --- a/drivers/md/Kconfig
> > +++ b/drivers/md/Kconfig
> > @@ -158,7 +158,6 @@ config MULTICORE_RAID456
> > bool "RAID-4/RAID-5/RAID-6 Multicore processing (EXPERIMENTAL)"
> > depends on MD_RAID456
> > depends on SMP
> > - depends on EXPERIMENTAL
>
> In this case MULTICORE_RAID456 and the related code should go as
> well... now that there are patches to supersede this implementation in
> md-next.
>
What a good idea.
Following will be in -next shortly.
NeilBrown
From 51acbcec6c42b24482bac18e42befc822524535d Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@xxxxxxx>
Date: Thu, 28 Feb 2013 09:08:34 +1100
Subject: [PATCH] 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@xxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: NeilBrown <neilb@xxxxxxx>
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 91a02ee..9a10313 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 19d77a0..35031c8 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);
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