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| author |  David Miller <davem@davemloft.net>
| 2020-02-24 15:01:45 +0100 |
|---|---|---|
| committer |  Alexei Starovoitov <ast@kernel.org>
| 2020-02-24 16:20:09 -0800 |
| commit | 02ad05965491ca72034327d47da6cb25f3a92603 (patch) | |
| tree | 3acf6c839448a780cf43252693653245f3cf51eb /kernel | |
| parent | bpf/tests: Use migrate disable instead of preempt disable (diff) | |
| download | linux-02ad05965491ca72034327d47da6cb25f3a92603.tar.gz linux-02ad05965491ca72034327d47da6cb25f3a92603.tar.bz2 linux-02ad05965491ca72034327d47da6cb25f3a92603.zip | |
bpf: Use migrate_disable/enabe() in trampoline code.
Instead of preemption disable/enable to reflect the purpose. This allows
PREEMPT_RT to substitute it with an actual migration disable
implementation. On non RT kernels this is still mapped to
preempt_disable/enable().
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200224145643.891428873@linutronix.de
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/trampoline.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c index 6b264a92064b..704fa787fec0 100644 --- a/kernel/bpf/trampoline.c +++ b/kernel/bpf/trampoline.c @@ -367,8 +367,9 @@ out: mutex_unlock(&trampoline_mutex); } -/* The logic is similar to BPF_PROG_RUN, but with explicit rcu and preempt that - * are needed for trampoline. The macro is split into +/* The logic is similar to BPF_PROG_RUN, but with an explicit + * rcu_read_lock() and migrate_disable() which are required + * for the trampoline. The macro is split into * call _bpf_prog_enter * call prog->bpf_func * call __bpf_prog_exit @@ -378,7 +379,7 @@ u64 notrace __bpf_prog_enter(void) u64 start = 0; rcu_read_lock(); - preempt_disable(); + migrate_disable(); if (static_branch_unlikely(&bpf_stats_enabled_key)) start = sched_clock(); return start; @@ -401,7 +402,7 @@ void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start) stats->nsecs += sched_clock() - start; u64_stats_update_end(&stats->syncp); } - preempt_enable(); + migrate_enable(); rcu_read_unlock(); } |