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| author |   Valentin Schneider <valentin.schneider@arm.com> | 2021-11-12 18:52:01 +0000 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2022-04-05 10:24:42 +0200 |
| commit | cfe43f478b79ba45573ca22d52d0d8823be068fa (patch) | |
| tree | 57e4b23a2770f3889fa8f58ff7296d1bc360b88a /kernel/sched/core.c | |
| parent | Linux 5.18-rc1 (diff) | |
| download | linux-dev-cfe43f478b79ba45573ca22d52d0d8823be068fa.tar.xz linux-dev-cfe43f478b79ba45573ca22d52d0d8823be068fa.zip | |
preempt/dynamic: Introduce preemption model accessors
CONFIG_PREEMPT{_NONE, _VOLUNTARY} designate either:
o The build-time preemption model when !PREEMPT_DYNAMIC
o The default boot-time preemption model when PREEMPT_DYNAMIC
IOW, using those on PREEMPT_DYNAMIC kernels is meaningless - the actual
model could have been set to something else by the "preempt=foo" cmdline
parameter. Same problem applies to CONFIG_PREEMPTION.
Introduce a set of helpers to determine the actual preemption model used by
the live kernel.
Suggested-by: Marco Elver <elver@google.com>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Marco Elver <elver@google.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20211112185203.280040-3-valentin.schneider@arm.com
Diffstat (limited to '')
| -rw-r--r-- | kernel/sched/core.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index d575b4914925..068c088e9584 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -8409,6 +8409,18 @@ static void __init preempt_dynamic_init(void) } } +#define PREEMPT_MODEL_ACCESSOR(mode) \ + bool preempt_model_##mode(void) \ + { \ + WARN_ON_ONCE(preempt_dynamic_mode == preempt_dynamic_undefined); \ + return preempt_dynamic_mode == preempt_dynamic_##mode; \ + } \ + EXPORT_SYMBOL_GPL(preempt_model_##mode) + +PREEMPT_MODEL_ACCESSOR(none); +PREEMPT_MODEL_ACCESSOR(voluntary); +PREEMPT_MODEL_ACCESSOR(full); + #else /* !CONFIG_PREEMPT_DYNAMIC */ static inline void preempt_dynamic_init(void) { } |