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| author | Frederic Weisbecker <frederic@kernel.org> | 2019-11-08 17:08:55 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-11-11 09:02:56 +0100 |
| commit | 153bedbac2ebd475e1c7c2d2fa0c042f5525927d (patch) | |
| tree | 80be4ee2af1d7aa3cc52be50c225f32002dd2dad /kernel/bpf/stackmap.c | |
| parent | Linux 5.4-rc7 (diff) | |
| download | linux-153bedbac2ebd475e1c7c2d2fa0c042f5525927d.tar.xz linux-153bedbac2ebd475e1c7c2d2fa0c042f5525927d.zip | |
irq_work: Convert flags to atomic_t
We need to convert flags to atomic_t in order to later fix an ordering
issue on atomic_cmpxchg() failure. This will allow us to use atomic_fetch_or().
Also clarify the nature of those flags.
[ mingo: Converted two more usage site the original patch missed. ]
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20191108160858.31665-2-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/bpf/stackmap.c')
| -rw-r--r-- | kernel/bpf/stackmap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c index 052580c33d26..4d31284095e2 100644 --- a/kernel/bpf/stackmap.c +++ b/kernel/bpf/stackmap.c @@ -289,7 +289,7 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs, if (in_nmi()) { work = this_cpu_ptr(&up_read_work); - if (work->irq_work.flags & IRQ_WORK_BUSY) + if (atomic_read(&work->irq_work.flags) & IRQ_WORK_BUSY) /* cannot queue more up_read, fallback */ irq_work_busy = true; } |