[V3,07/22] perf/bpf: Remove preempt disable around BPF invocation
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Message ID 20200224145643.151953573@linutronix.de
State Accepted
Delegated to: BPF Maintainers
Headers show
Series
  • bpf: Make BPF and PREEMPT_RT co-exist
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Commit Message

Thomas Gleixner Feb. 24, 2020, 2:01 p.m. UTC
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>
---
 kernel/events/core.c |    2 --
 1 file changed, 2 deletions(-)

Patch
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--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -9206,7 +9206,6 @@  static void bpf_overflow_handler(struct
 	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();
@@ -9214,7 +9213,6 @@  static void bpf_overflow_handler(struct
 	rcu_read_unlock();
 out:
 	__this_cpu_dec(bpf_prog_active);
-	preempt_enable();
 	if (!ret)
 		return;