diff options
| author | Douglas Anderson <dianders@chromium.org> | 2023-09-06 19:02:57 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2023-09-25 19:15:28 +0300 |
| commit | d0c14a7d36f035aeae1bdd6f4afc6488400ed5cf (patch) | |
| tree | 7d83cab6c3b3a8c5d926b3856312a4ed27cc030c | |
| parent | a02026bf9da13cd44fb444857d5aebc934e1af5a (diff) | |
| download | linux-d0c14a7d36f035aeae1bdd6f4afc6488400ed5cf.tar.xz | |
arm64: idle: Tag the arm64 idle functions as __cpuidle
As per the (somewhat recent) comment before the definition of
`__cpuidle`, the tag is like `noinstr` but also marks a function so it
can be identified by cpu_in_idle(). Let's add these markings to arm64
cpuidle functions
With this change we get useful backtraces like:
NMI backtrace for cpu N skipped: idling at cpu_do_idle+0x94/0x98
instead of useless backtraces when dumping all processors using
nmi_cpu_backtrace().
NOTE: this patch won't make cpu_in_idle() work perfectly for arm64,
but it doesn't hurt and does catch some cases. Specifically an example
that wasn't caught in my testing looked like this:
gic_cpu_sys_reg_init+0x1f8/0x314
gic_cpu_pm_notifier+0x40/0x78
raw_notifier_call_chain+0x5c/0x134
cpu_pm_notify+0x38/0x64
cpu_pm_exit+0x20/0x2c
psci_enter_idle_state+0x48/0x70
cpuidle_enter_state+0xb8/0x260
cpuidle_enter+0x44/0x5c
do_idle+0x188/0x30c
Acked-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: Sumit Garg <sumit.garg@linaro.org>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20230906090246.v13.2.I4baba13e220bdd24d11400c67f137c35f07f82c7@changeid
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
| -rw-r--r-- | arch/arm64/kernel/idle.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/kernel/idle.c b/arch/arm64/kernel/idle.c index c1125753fe9b..05cfb347ec26 100644 --- a/arch/arm64/kernel/idle.c +++ b/arch/arm64/kernel/idle.c @@ -20,7 +20,7 @@ * ensure that interrupts are not masked at the PMR (because the core will * not wake up if we block the wake up signal in the interrupt controller). */ -void noinstr cpu_do_idle(void) +void __cpuidle cpu_do_idle(void) { struct arm_cpuidle_irq_context context; @@ -35,7 +35,7 @@ void noinstr cpu_do_idle(void) /* * This is our default idle handler. */ -void noinstr arch_cpu_idle(void) +void __cpuidle arch_cpu_idle(void) { /* * This should do all the clock switching and wait for interrupt |