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| author | Andrew Morton <akpm@linux-foundation.org> | 2010-01-08 14:42:39 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-01-11 09:34:04 -0800 |
| commit | 129182e5626972ac0df85d43a36dd46ad61c64e1 (patch) | |
| tree | c91d17c697aa29d284dbe065423e01ca7020db73 | |
| parent | 8767ba2796a1c894e6d9524584a26a8224f0543d (diff) | |
| download | op-kernel-dev-129182e5626972ac0df85d43a36dd46ad61c64e1.zip op-kernel-dev-129182e5626972ac0df85d43a36dd46ad61c64e1.tar.gz | |
percpu: avoid calling __pcpu_ptr_to_addr(NULL)
__pcpu_ptr_to_addr() can be overridden by the architecture and might not
behave well if passed a NULL pointer. So avoid calling it until we have
verified that its arg is not NULL.
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/percpu.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/percpu.c b/mm/percpu.c index 442010c..083e7c9 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -1271,7 +1271,7 @@ static void pcpu_reclaim(struct work_struct *work) */ void free_percpu(void *ptr) { - void *addr = __pcpu_ptr_to_addr(ptr); + void *addr; struct pcpu_chunk *chunk; unsigned long flags; int off; @@ -1279,6 +1279,8 @@ void free_percpu(void *ptr) if (!ptr) return; + addr = __pcpu_ptr_to_addr(ptr); + spin_lock_irqsave(&pcpu_lock, flags); chunk = pcpu_chunk_addr_search(addr); |
