* [patch] percpu: off by one in BUG_ON()
@ 2014-10-29 8:45 Dan Carpenter
2014-10-29 14:35 ` Tejun Heo
0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2014-10-29 8:45 UTC (permalink / raw)
To: Tejun Heo; +Cc: Christoph Lameter, linux-mm, kernel-janitors
The unit_map[] array has "nr_cpu_ids" number of elements. It's
allocated a few lines earlier in the function. So this test should be
>= instead of >.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
Static checker stuff. Not tested.
diff --git a/mm/percpu.c b/mm/percpu.c
index 014bab6..d39e2f4 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1591,7 +1591,7 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
if (cpu == NR_CPUS)
continue;
- PCPU_SETUP_BUG_ON(cpu > nr_cpu_ids);
+ PCPU_SETUP_BUG_ON(cpu >= nr_cpu_ids);
PCPU_SETUP_BUG_ON(!cpu_possible(cpu));
PCPU_SETUP_BUG_ON(unit_map[cpu] != UINT_MAX);
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* Re: [patch] percpu: off by one in BUG_ON()
2014-10-29 8:45 [patch] percpu: off by one in BUG_ON() Dan Carpenter
@ 2014-10-29 14:35 ` Tejun Heo
0 siblings, 0 replies; 2+ messages in thread
From: Tejun Heo @ 2014-10-29 14:35 UTC (permalink / raw)
To: Dan Carpenter; +Cc: Christoph Lameter, linux-mm, kernel-janitors
On Wed, Oct 29, 2014 at 11:45:04AM +0300, Dan Carpenter wrote:
> The unit_map[] array has "nr_cpu_ids" number of elements. It's
> allocated a few lines earlier in the function. So this test should be
> >= instead of >.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Applied to percpu/for-3.19.
Thanks.
--
tejun
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