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| author | Anton Blanchard <anton@samba.org> | 2016-04-06 21:59:50 +1000 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-04-13 13:22:37 +0200 |
| commit | bd92883051a0228cc34996b8e766111ba10c9aac (patch) | |
| tree | f0f1e3253cd3938d48bbbbd5f6605c02e0237043 /kernel/sched/cpuacct.c | |
| parent | 2c923e94cd9c6acff3b22f0ae29cfe65e2658b40 (diff) | |
| download | talos-obmc-linux-bd92883051a0228cc34996b8e766111ba10c9aac.tar.gz talos-obmc-linux-bd92883051a0228cc34996b8e766111ba10c9aac.zip | |
sched/cpuacct: Check for NULL when using task_pt_regs()
task_pt_regs() can return NULL for kernel threads, so add a check.
This fixes an oops at boot on ppc64.
Reported-and-Tested-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Tested-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: efault@gmx.de
Cc: htejun@gmail.com
Cc: linuxppc-dev@lists.ozlabs.org
Cc: tj@kernel.org
Cc: yangds.fnst@cn.fujitsu.com
Link: http://lkml.kernel.org/r/20160406215950.04bc3f0b@kryten
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/cpuacct.c')
| -rw-r--r-- | kernel/sched/cpuacct.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c index df947e07aac1..41f85c4d0938 100644 --- a/kernel/sched/cpuacct.c +++ b/kernel/sched/cpuacct.c @@ -316,12 +316,11 @@ static struct cftype files[] = { void cpuacct_charge(struct task_struct *tsk, u64 cputime) { struct cpuacct *ca; - int index; + int index = CPUACCT_USAGE_SYSTEM; + struct pt_regs *regs = task_pt_regs(tsk); - if (user_mode(task_pt_regs(tsk))) + if (regs && user_mode(regs)) index = CPUACCT_USAGE_USER; - else - index = CPUACCT_USAGE_SYSTEM; rcu_read_lock(); |
