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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-08-07 16:41:01 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-08-07 16:41:01 -0700 |
| commit | 9e8238020c5beba64e7ffafbb7ea0fb02fe68270 (patch) | |
| tree | 37c7fd953cfa7ebd3d6c476bc4c7d4de2302cdc3 /kernel/bpf/stackmap.c | |
| parent | a50ca29523b18baea548bdf5df9b4b923c2bb4f6 (diff) | |
| parent | d862a3068ea593dc904ef524d8548467755ce36f (diff) | |
| download | cachepc-linux-9e8238020c5beba64e7ffafbb7ea0fb02fe68270.tar.gz cachepc-linux-9e8238020c5beba64e7ffafbb7ea0fb02fe68270.zip | |
Merge branch 'next' into for-linus
Prepare input updates for 5.9 merge window.
Diffstat (limited to 'kernel/bpf/stackmap.c')
| -rw-r--r-- | kernel/bpf/stackmap.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c index 3f958b90d914..db76339fe358 100644 --- a/kernel/bpf/stackmap.c +++ b/kernel/bpf/stackmap.c @@ -40,6 +40,9 @@ static void do_up_read(struct irq_work *entry) { struct stack_map_irq_work *work; + if (WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_RT))) + return; + work = container_of(entry, struct stack_map_irq_work, irq_work); up_read_non_owner(work->sem); work->sem = NULL; @@ -288,10 +291,19 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs, struct stack_map_irq_work *work = NULL; if (irqs_disabled()) { - work = this_cpu_ptr(&up_read_work); - if (atomic_read(&work->irq_work.flags) & IRQ_WORK_BUSY) - /* cannot queue more up_read, fallback */ + if (!IS_ENABLED(CONFIG_PREEMPT_RT)) { + work = this_cpu_ptr(&up_read_work); + if (atomic_read(&work->irq_work.flags) & IRQ_WORK_BUSY) { + /* cannot queue more up_read, fallback */ + irq_work_busy = true; + } + } else { + /* + * PREEMPT_RT does not allow to trylock mmap sem in + * interrupt disabled context. Force the fallback code. + */ irq_work_busy = true; + } } /* |