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authorMichael Ellerman <mpe@ellerman.id.au>2023-04-06 16:45:34 +0200
committerMichael Ellerman <mpe@ellerman.id.au>2023-04-20 05:21:49 +0200
commit88990745c934b14359e526033c5bc1daaf15267c (patch)
tree1fbc35626d2a1132017c17071b761fc90f394ff1 /drivers/cpuidle
parentpowerpc/64: Don't call trace_hardirqs_on() in prep_irq_for_idle() (diff)
downloadlinux-88990745c934b14359e526033c5bc1daaf15267c.tar.xz
linux-88990745c934b14359e526033c5bc1daaf15267c.zip
cpuidle: pseries: Mark ->enter() functions as __cpuidle
Code in the idle path is not allowed to be instrumented because RCU is disabled, see commit 0e985e9d2286 ("cpuidle: Add comments about noinstr/__cpuidle usage"). Mark the cpuidle ->enter() callbacks as __cpuidle and use the raw_local_irq_*() routines to ensure that is the case. Reported-by: Sachin Sant <sachinp@linux.ibm.com> Link: https://lore.kernel.org/all/4C073F6A-C812-4C4A-BB7A-ECD10B75FB88@linux.ibm.com/ Suggested-by: Peter Zijlstra <peterz@infradead.org> Tested-by: Sachin Sant <sachinp@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20230406144535.3786008-3-mpe@ellerman.id.au
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle-pseries.c28
1 files changed, 14 insertions, 14 deletions
diff --git a/drivers/cpuidle/cpuidle-pseries.c b/drivers/cpuidle/cpuidle-pseries.c
index 1bad4d2b7be3..a7d33f3ee01e 100644
--- a/drivers/cpuidle/cpuidle-pseries.c
+++ b/drivers/cpuidle/cpuidle-pseries.c
@@ -33,16 +33,16 @@ static struct cpuidle_state *cpuidle_state_table __read_mostly;
static u64 snooze_timeout __read_mostly;
static bool snooze_timeout_en __read_mostly;
-static int snooze_loop(struct cpuidle_device *dev,
- struct cpuidle_driver *drv,
- int index)
+static __cpuidle
+int snooze_loop(struct cpuidle_device *dev, struct cpuidle_driver *drv,
+ int index)
{
u64 snooze_exit_time;
set_thread_flag(TIF_POLLING_NRFLAG);
pseries_idle_prolog();
- local_irq_enable();
+ raw_local_irq_enable();
snooze_exit_time = get_tb() + snooze_timeout;
dev->poll_time_limit = false;
@@ -65,14 +65,14 @@ static int snooze_loop(struct cpuidle_device *dev,
HMT_medium();
clear_thread_flag(TIF_POLLING_NRFLAG);
- local_irq_disable();
+ raw_local_irq_disable();
pseries_idle_epilog();
return index;
}
-static void check_and_cede_processor(void)
+static __cpuidle void check_and_cede_processor(void)
{
/*
* Ensure our interrupt state is properly tracked,
@@ -216,9 +216,9 @@ static int __init parse_cede_parameters(void)
#define NR_DEDICATED_STATES 2 /* snooze, CEDE */
static u8 cede_latency_hint[NR_DEDICATED_STATES];
-static int dedicated_cede_loop(struct cpuidle_device *dev,
- struct cpuidle_driver *drv,
- int index)
+static __cpuidle
+int dedicated_cede_loop(struct cpuidle_device *dev, struct cpuidle_driver *drv,
+ int index)
{
u8 old_latency_hint;
@@ -230,7 +230,7 @@ static int dedicated_cede_loop(struct cpuidle_device *dev,
HMT_medium();
check_and_cede_processor();
- local_irq_disable();
+ raw_local_irq_disable();
get_lppaca()->donate_dedicated_cpu = 0;
get_lppaca()->cede_latency_hint = old_latency_hint;
@@ -239,9 +239,9 @@ static int dedicated_cede_loop(struct cpuidle_device *dev,
return index;
}
-static int shared_cede_loop(struct cpuidle_device *dev,
- struct cpuidle_driver *drv,
- int index)
+static __cpuidle
+int shared_cede_loop(struct cpuidle_device *dev, struct cpuidle_driver *drv,
+ int index)
{
pseries_idle_prolog();
@@ -255,7 +255,7 @@ static int shared_cede_loop(struct cpuidle_device *dev,
*/
check_and_cede_processor();
- local_irq_disable();
+ raw_local_irq_disable();
pseries_idle_epilog();
return index;