[PATCH] mm: compaction: update comment about zone lock in isolate_freepages_block

[PATCH] mm: compaction: update comment about zone lock in isolate_freepages_block

[Jerome Marchand]

Since commit f40d1e4 (mm: compaction: acquire the zone->lock as late as
possible), isolate_freepages_block() takes the zone->lock itself. The
function description however still states that the zone->lock must be
held.
This patch removes this outdated statement.

Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
---
 mm/compaction.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 05ccb4c..9f9026f 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -235,10 +235,9 @@ static bool suitable_migration_target(struct page *page)
 }
 
 /*
- * Isolate free pages onto a private freelist. Caller must hold zone->lock.
- * If @strict is true, will abort returning 0 on any invalid PFNs or non-free
- * pages inside of the pageblock (even though it may still end up isolating
- * some pages).
+ * Isolate free pages onto a private freelist. If @strict is true, will abort
+ * returning 0 on any invalid PFNs or non-free pages inside of the pageblock
+ * (even though it may still end up isolating some pages).
  */
 static unsigned long isolate_freepages_block(struct compact_control *cc,
 				unsigned long blockpfn,
-- 
1.7.7.6

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Re: [PATCH] mm: compaction: update comment about zone lock in isolate_freepages_block

[Wanpeng Li]

On Fri, Aug 30, 2013 at 04:07:28PM +0200, Jerome Marchand wrote:
>Since commit f40d1e4 (mm: compaction: acquire the zone->lock as late as
>possible), isolate_freepages_block() takes the zone->lock itself. The
>function description however still states that the zone->lock must be
>held.
>This patch removes this outdated statement.
>

Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>

>Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
>---
> mm/compaction.c |    7 +++----
> 1 files changed, 3 insertions(+), 4 deletions(-)
>
>diff --git a/mm/compaction.c b/mm/compaction.c
>index 05ccb4c..9f9026f 100644
>--- a/mm/compaction.c
>+++ b/mm/compaction.c
>@@ -235,10 +235,9 @@ static bool suitable_migration_target(struct page *page)
> }
>
> /*
>- * Isolate free pages onto a private freelist. Caller must hold zone->lock.
>- * If @strict is true, will abort returning 0 on any invalid PFNs or non-free
>- * pages inside of the pageblock (even though it may still end up isolating
>- * some pages).
>+ * Isolate free pages onto a private freelist. If @strict is true, will abort
>+ * returning 0 on any invalid PFNs or non-free pages inside of the pageblock
>+ * (even though it may still end up isolating some pages).
>  */
> static unsigned long isolate_freepages_block(struct compact_control *cc,
> 				unsigned long blockpfn,
>-- 
>1.7.7.6
>
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Re: [PATCH] mm: compaction: update comment about zone lock in isolate_freepages_block

[Wanpeng Li]

On Fri, Aug 30, 2013 at 04:07:28PM +0200, Jerome Marchand wrote:
>Since commit f40d1e4 (mm: compaction: acquire the zone->lock as late as
>possible), isolate_freepages_block() takes the zone->lock itself. The
>function description however still states that the zone->lock must be
>held.
>This patch removes this outdated statement.
>

Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>

>Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
>---
> mm/compaction.c |    7 +++----
> 1 files changed, 3 insertions(+), 4 deletions(-)
>
>diff --git a/mm/compaction.c b/mm/compaction.c
>index 05ccb4c..9f9026f 100644
>--- a/mm/compaction.c
>+++ b/mm/compaction.c
>@@ -235,10 +235,9 @@ static bool suitable_migration_target(struct page *page)
> }
>
> /*
>- * Isolate free pages onto a private freelist. Caller must hold zone->lock.
>- * If @strict is true, will abort returning 0 on any invalid PFNs or non-free
>- * pages inside of the pageblock (even though it may still end up isolating
>- * some pages).
>+ * Isolate free pages onto a private freelist. If @strict is true, will abort
>+ * returning 0 on any invalid PFNs or non-free pages inside of the pageblock
>+ * (even though it may still end up isolating some pages).
>  */
> static unsigned long isolate_freepages_block(struct compact_control *cc,
> 				unsigned long blockpfn,
>-- 
>1.7.7.6
>
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