diff mbox series

[V2,10/20] trace/bpf: Use migrate disable in trace_call_bpf()

Message ID 20200220204618.320890020@linutronix.de
State Changes Requested
Delegated to: BPF Maintainers
Headers show
Series bpf: Make BPF and PREEMPT_RT co-exist | expand

Commit Message

Thomas Gleixner Feb. 20, 2020, 8:45 p.m. UTC 
BPF does not require preemption disable. It only requires to stay on the
same CPU while running a program. Reflect this by replacing
preempt_disable/enable() with migrate_disable/enable() pairs.

On a non-RT kernel this maps to preempt_disable/enable().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/trace/bpf_trace.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -83,7 +83,7 @@  unsigned int trace_call_bpf(struct trace
 	if (in_nmi()) /* not supported yet */
 		return 1;
 
-	preempt_disable();
+	migrate_disable();
 
 	if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) {
 		/*
@@ -115,7 +115,7 @@  unsigned int trace_call_bpf(struct trace
 
  out:
 	__this_cpu_dec(bpf_prog_active);
-	preempt_enable();
+	migrate_enable();
 
 	return ret;
 }