All of lore.kernel.org
 help / color / mirror / Atom feed
* [PATCH] swapfile: initialize spinlock for swap_cluster_info
@ 2017-02-07  2:35 ` Minchan Kim
  0 siblings, 0 replies; 4+ messages in thread
From: Minchan Kim @ 2017-02-07  2:35 UTC (permalink / raw)
  To: Andrew Morton
  Cc: linux-kernel, linux-mm, Minchan Kim, Tim Chen, Huang Ying, Hugh Dickins

We changed swap_cluster_info lock from bit_spin_lock to spinlock
so we need to initialize the spinlock before the using. Otherwise,
lockdep is broken.

Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
---
Andrew,
I think it's no worth to add this patch to separate commit.
If you don't mind, it's okay to fold this patch to mm-swap-add-cluster-lock-v5.
Thanks.

 mm/swapfile.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 1fc1824140e1..5ac2cb40dbd3 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2762,6 +2762,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 
 	if (p->bdev && blk_queue_nonrot(bdev_get_queue(p->bdev))) {
 		int cpu;
+		unsigned long ci, nr_cluster;
 
 		p->flags |= SWP_SOLIDSTATE;
 		/*
@@ -2769,13 +2770,17 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 		 * SSD
 		 */
 		p->cluster_next = 1 + (prandom_u32() % p->highest_bit);
+		nr_cluster = DIV_ROUND_UP(maxpages, SWAPFILE_CLUSTER);
 
-		cluster_info = vzalloc(DIV_ROUND_UP(maxpages,
-			SWAPFILE_CLUSTER) * sizeof(*cluster_info));
+		cluster_info = vzalloc(nr_cluster * sizeof(*cluster_info));
 		if (!cluster_info) {
 			error = -ENOMEM;
 			goto bad_swap;
 		}
+
+		for (ci = 0; ci < nr_cluster; ci++)
+			spin_lock_init(&((cluster_info + ci)->lock));
+
 		p->percpu_cluster = alloc_percpu(struct percpu_cluster);
 		if (!p->percpu_cluster) {
 			error = -ENOMEM;
-- 
2.7.4

^ permalink raw reply	[flat|nested] 4+ messages in thread

* [PATCH] swapfile: initialize spinlock for swap_cluster_info
@ 2017-02-07  2:35 ` Minchan Kim
  0 siblings, 0 replies; 4+ messages in thread
From: Minchan Kim @ 2017-02-07  2:35 UTC (permalink / raw)
  To: Andrew Morton
  Cc: linux-kernel, linux-mm, Minchan Kim, Tim Chen, Huang Ying, Hugh Dickins

We changed swap_cluster_info lock from bit_spin_lock to spinlock
so we need to initialize the spinlock before the using. Otherwise,
lockdep is broken.

Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
---
Andrew,
I think it's no worth to add this patch to separate commit.
If you don't mind, it's okay to fold this patch to mm-swap-add-cluster-lock-v5.
Thanks.

 mm/swapfile.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 1fc1824140e1..5ac2cb40dbd3 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2762,6 +2762,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 
 	if (p->bdev && blk_queue_nonrot(bdev_get_queue(p->bdev))) {
 		int cpu;
+		unsigned long ci, nr_cluster;
 
 		p->flags |= SWP_SOLIDSTATE;
 		/*
@@ -2769,13 +2770,17 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 		 * SSD
 		 */
 		p->cluster_next = 1 + (prandom_u32() % p->highest_bit);
+		nr_cluster = DIV_ROUND_UP(maxpages, SWAPFILE_CLUSTER);
 
-		cluster_info = vzalloc(DIV_ROUND_UP(maxpages,
-			SWAPFILE_CLUSTER) * sizeof(*cluster_info));
+		cluster_info = vzalloc(nr_cluster * sizeof(*cluster_info));
 		if (!cluster_info) {
 			error = -ENOMEM;
 			goto bad_swap;
 		}
+
+		for (ci = 0; ci < nr_cluster; ci++)
+			spin_lock_init(&((cluster_info + ci)->lock));
+
 		p->percpu_cluster = alloc_percpu(struct percpu_cluster);
 		if (!p->percpu_cluster) {
 			error = -ENOMEM;
-- 
2.7.4

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH] swapfile: initialize spinlock for swap_cluster_info
  2017-02-07  2:35 ` Minchan Kim
@ 2017-02-07  2:52   ` Huang, Ying
  -1 siblings, 0 replies; 4+ messages in thread
From: Huang, Ying @ 2017-02-07  2:52 UTC (permalink / raw)
  To: Minchan Kim
  Cc: Andrew Morton, linux-kernel, linux-mm, Tim Chen, Huang Ying,
	Hugh Dickins

Hi, Minchan,

Minchan Kim <minchan@kernel.org> writes:

> We changed swap_cluster_info lock from bit_spin_lock to spinlock
> so we need to initialize the spinlock before the using. Otherwise,
> lockdep is broken.
>
> Cc: Tim Chen <tim.c.chen@linux.intel.com>
> Cc: Huang Ying <ying.huang@intel.com>
> Cc: Hugh Dickins <hughd@google.com>
> Signed-off-by: Minchan Kim <minchan@kernel.org>

Good catch!  Thanks a lot for your fixing!

Reviewed-by: "Huang, Ying" <ying.huang@intel.com>

Best Regards,
Huang, Ying

> ---
> Andrew,
> I think it's no worth to add this patch to separate commit.
> If you don't mind, it's okay to fold this patch to mm-swap-add-cluster-lock-v5.
> Thanks.
>
>  mm/swapfile.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index 1fc1824140e1..5ac2cb40dbd3 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -2762,6 +2762,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
>  
>  	if (p->bdev && blk_queue_nonrot(bdev_get_queue(p->bdev))) {
>  		int cpu;
> +		unsigned long ci, nr_cluster;
>  
>  		p->flags |= SWP_SOLIDSTATE;
>  		/*
> @@ -2769,13 +2770,17 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
>  		 * SSD
>  		 */
>  		p->cluster_next = 1 + (prandom_u32() % p->highest_bit);
> +		nr_cluster = DIV_ROUND_UP(maxpages, SWAPFILE_CLUSTER);
>  
> -		cluster_info = vzalloc(DIV_ROUND_UP(maxpages,
> -			SWAPFILE_CLUSTER) * sizeof(*cluster_info));
> +		cluster_info = vzalloc(nr_cluster * sizeof(*cluster_info));
>  		if (!cluster_info) {
>  			error = -ENOMEM;
>  			goto bad_swap;
>  		}
> +
> +		for (ci = 0; ci < nr_cluster; ci++)
> +			spin_lock_init(&((cluster_info + ci)->lock));
> +
>  		p->percpu_cluster = alloc_percpu(struct percpu_cluster);
>  		if (!p->percpu_cluster) {
>  			error = -ENOMEM;

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH] swapfile: initialize spinlock for swap_cluster_info
@ 2017-02-07  2:52   ` Huang, Ying
  0 siblings, 0 replies; 4+ messages in thread
From: Huang, Ying @ 2017-02-07  2:52 UTC (permalink / raw)
  To: Minchan Kim
  Cc: Andrew Morton, linux-kernel, linux-mm, Tim Chen, Huang Ying,
	Hugh Dickins

Hi, Minchan,

Minchan Kim <minchan@kernel.org> writes:

> We changed swap_cluster_info lock from bit_spin_lock to spinlock
> so we need to initialize the spinlock before the using. Otherwise,
> lockdep is broken.
>
> Cc: Tim Chen <tim.c.chen@linux.intel.com>
> Cc: Huang Ying <ying.huang@intel.com>
> Cc: Hugh Dickins <hughd@google.com>
> Signed-off-by: Minchan Kim <minchan@kernel.org>

Good catch!  Thanks a lot for your fixing!

Reviewed-by: "Huang, Ying" <ying.huang@intel.com>

Best Regards,
Huang, Ying

> ---
> Andrew,
> I think it's no worth to add this patch to separate commit.
> If you don't mind, it's okay to fold this patch to mm-swap-add-cluster-lock-v5.
> Thanks.
>
>  mm/swapfile.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index 1fc1824140e1..5ac2cb40dbd3 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -2762,6 +2762,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
>  
>  	if (p->bdev && blk_queue_nonrot(bdev_get_queue(p->bdev))) {
>  		int cpu;
> +		unsigned long ci, nr_cluster;
>  
>  		p->flags |= SWP_SOLIDSTATE;
>  		/*
> @@ -2769,13 +2770,17 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
>  		 * SSD
>  		 */
>  		p->cluster_next = 1 + (prandom_u32() % p->highest_bit);
> +		nr_cluster = DIV_ROUND_UP(maxpages, SWAPFILE_CLUSTER);
>  
> -		cluster_info = vzalloc(DIV_ROUND_UP(maxpages,
> -			SWAPFILE_CLUSTER) * sizeof(*cluster_info));
> +		cluster_info = vzalloc(nr_cluster * sizeof(*cluster_info));
>  		if (!cluster_info) {
>  			error = -ENOMEM;
>  			goto bad_swap;
>  		}
> +
> +		for (ci = 0; ci < nr_cluster; ci++)
> +			spin_lock_init(&((cluster_info + ci)->lock));
> +
>  		p->percpu_cluster = alloc_percpu(struct percpu_cluster);
>  		if (!p->percpu_cluster) {
>  			error = -ENOMEM;

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2017-02-07  2:53 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-02-07  2:35 [PATCH] swapfile: initialize spinlock for swap_cluster_info Minchan Kim
2017-02-07  2:35 ` Minchan Kim
2017-02-07  2:52 ` Huang, Ying
2017-02-07  2:52   ` Huang, Ying

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.