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mm, percpu: Make sure percpu_alloc early parameter has an argument

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Otherwise we are getting a nil dereference if percpu_alloc kernel boot
argument is specified without value.

 | [    0.000000] BUG: unable to handle kernel NULL pointer dereference at           (null)
 | [    0.000000] IP: [<ffffffff81391360>] strcmp+0x10/0x30

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Cyrill Gorcunov 2012-11-25 01:17:13 +04:00 committed by Tejun Heo
parent b4916cb17c
commit 5479c78ac6
1 changed files with 3 additions and 0 deletions
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3
mm/percpu.c
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@ -1380,6 +1380,9 @@ enum pcpu_fc pcpu_chosen_fc __initdata = PCPU_FC_AUTO;
static int __init percpu_alloc_setup(char *str) static int __init percpu_alloc_setup(char *str)
{ {
if (!str)
return -EINVAL;
if (0) if (0)
/* nada */; /* nada */;
#ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK #ifdef CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK