Messages in this thread Patch in this message | | | Date | Mon, 24 Feb 2020 15:01:38 +0100 | From | Thomas Gleixner <> | Subject | [patch V3 07/22] perf/bpf: Remove preempt disable around BPF invocation |
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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(-)
--- 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;
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