cpuset.c:update_nodemask() uses a write_lock_irq() on tasklist_lock to
block concurrent forks; a read_lock() suffices and is less intrusive.
Signed-off-by: Paul Menage<[email protected]>
---
kernel/cpuset.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
Index: scratch-2.6.22-rc1-mm1/kernel/cpuset.c
===================================================================
--- scratch-2.6.22-rc1-mm1.orig/kernel/cpuset.c
+++ scratch-2.6.22-rc1-mm1/kernel/cpuset.c
@@ -923,10 +923,10 @@ static int update_nodemask(struct cpuset
mmarray = kmalloc(ntasks * sizeof(*mmarray), GFP_KERNEL);
if (!mmarray)
goto done;
- write_lock_irq(&tasklist_lock); /* block fork */
+ read_lock(&tasklist_lock); /* block fork */
if (atomic_read(&cs->count) <= ntasks)
break; /* got enough */
- write_unlock_irq(&tasklist_lock); /* try again */
+ read_unlock(&tasklist_lock); /* try again */
kfree(mmarray);
}
@@ -948,7 +948,7 @@ static int update_nodemask(struct cpuset
continue;
mmarray[n++] = mm;
} while_each_thread(g, p);
- write_unlock_irq(&tasklist_lock);
+ read_unlock(&tasklist_lock);
/*
* Now that we've dropped the tasklist spinlock, we can
-
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