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[V2,08/20] bpf: Replace cant_sleep() with cant_migrate()

Message ID 20200220204618.135607169@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
As already discussed in the previous change which introduced
BPF_RUN_PROG_PIN_ON_CPU() BPF only requires to disable migration to
guarantee per CPUness.

If RT substitutes the preempt disable based migration protection then the
cant_sleep() check will obviously trigger as preemption is not disabled.

Replace it by cant_migrate() which maps to cant_sleep() on a non RT kernel
and will verify that migration is disabled on a full RT kernel.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
 include/linux/filter.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -561,7 +561,7 @@  DECLARE_STATIC_KEY_FALSE(bpf_stats_enabl
 #define __BPF_PROG_RUN(prog, ctx, dfunc)	({			\
 	u32 ret;							\
-	cant_sleep();							\
+	cant_migrate();							\
 	if (static_branch_unlikely(&bpf_stats_enabled_key)) {		\
 		struct bpf_prog_stats *stats;				\
 		u64 start = sched_clock();				\