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Date:   Fri, 14 Feb 2020 14:39:21 +0100
From:   Thomas Gleixner <>
To:     LKML <>
Cc:     David Miller <>,,, Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Sebastian Sewior <>,
        Peter Zijlstra <>,
        Clark Williams <>,
        Steven Rostedt <>,
        Juri Lelli <>,
        Ingo Molnar <>
Subject: [RFC patch 04/19] bpf/tracing: Remove redundant preempt_disable() in __bpf_trace_run()

__bpf_trace_run() disables preemption around the BPF_PROG_RUN() invocation.

This is redundant because __bpf_trace_run() is invoked from a trace point
via __DO_TRACE() which already disables preemption _before_ invoking any of
the functions which are attached to a trace point.

Remove it.

Signed-off-by: Thomas Gleixner <>
 kernel/trace/bpf_trace.c |    2 --
 1 file changed, 2 deletions(-)

--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -1476,9 +1476,7 @@ static __always_inline
 void __bpf_trace_run(struct bpf_prog *prog, u64 *args)
-	preempt_disable();
 	(void) BPF_PROG_RUN(prog, args);
-	preempt_enable();

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