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perf/bpf: Remove preempt disable around BPF invocation 

The BPF invocation from the perf event overflow handler does not require to
disable preemption because this is called from NMI or at least hard
interrupt context which is already non-preemptible.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
This commit is contained in:
Thomas Gleixner 2020-02-24 15:01:38 +01:00 committed by Alibek Omarov
parent ded67a610a
commit d1a724bf1e
1 changed files with 0 additions and 2 deletions
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2
kernel/events/core.c
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@ -9000,7 +9000,6 @@ static void bpf_overflow_handler(struct perf_event *event,
int ret = 0;
ctx.regs = perf_arch_bpf_user_pt_regs(regs);
preempt_disable();
if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1))
goto out;
rcu_read_lock();
@ -9008,7 +9007,6 @@ static void bpf_overflow_handler(struct perf_event *event,
rcu_read_unlock();
out:
__this_cpu_dec(bpf_prog_active);
preempt_enable();
if (!ret)
return;