[patch V2 04/20] perf/bpf: Remove preempt disable around BPF invocation
From: Thomas Gleixner <hidden>
Date: 2020-02-20 20:57:44
Also in:
bpf, lkml
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 <redacted> --- 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;