The patch titled
pid: tighten pidmap spinlock critical section by removing kfree()
has been removed from the -mm tree. Its filename was
pid-tighten-pidmap-spinlock-critical-section-by-removing-kfree.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: pid: tighten pidmap spinlock critical section by removing kfree()
From: André Goddard Rosa <andre.goddard@xxxxxxxxx>
Avoid calling kfree() under pidmap spinlock, calling it afterwards.
Normally kfree() is fast, but sometimes it can be slow, so avoid
calling it under the spinlock if we can do it.
Signed-off-by: André Goddard Rosa <andre.goddard@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/pid.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff -puN kernel/pid.c~pid-tighten-pidmap-spinlock-critical-section-by-removing-kfree kernel/pid.c
--- a/kernel/pid.c~pid-tighten-pidmap-spinlock-critical-section-by-removing-kfree
+++ a/kernel/pid.c
@@ -141,11 +141,12 @@ static int alloc_pidmap(struct pid_names
* installing it:
*/
spin_lock_irq(&pidmap_lock);
- if (map->page)
- kfree(page);
- else
+ if (!map->page) {
map->page = page;
+ page = NULL;
+ }
spin_unlock_irq(&pidmap_lock);
+ kfree(page);
if (unlikely(!map->page))
break;
}
_
Patches currently in -mm which might be from andre.goddard@xxxxxxxxx are
origin.patch
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