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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-08-24 00:19:57 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-08-30 04:05:29 +0300
commitdc2251bf98c66db3f4e055b751968f0871037ae4 (patch)
treea18ffbaae6dc1e54069fd19ebcfc93b88d42a9fa /include/linux/cpuidle.h
parent84dc4141f0353bada6af53d32730f3e47e579bc0 (diff)
downloadlinux-dc2251bf98c66db3f4e055b751968f0871037ae4.tar.xz
cpuidle: Eliminate the CPUIDLE_DRIVER_STATE_START symbol
On some architectures the first (index 0) idle state is a polling one and it doesn't really save energy, so there is the CPUIDLE_DRIVER_STATE_START symbol allowing some pieces of cpuidle code to avoid using that state. However, this makes the code rather hard to follow. It is better to explicitly avoid the polling state, so add a new cpuidle state flag CPUIDLE_FLAG_POLLING to mark it and make the relevant code check that flag for the first state instead of using the CPUIDLE_DRIVER_STATE_START symbol. In the ACPI processor driver that cannot always rely on the state flags (like before the states table has been set up) define a new internal symbol ACPI_IDLE_STATE_START equivalent to the CPUIDLE_DRIVER_STATE_START one and drop the latter. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Sudeep Holla <sudeep.holla@arm.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'include/linux/cpuidle.h')
-rw-r--r--include/linux/cpuidle.h7
1 files changed, 1 insertions, 6 deletions
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index fc1e5d7fc1c7..b58d952a00e2 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -63,6 +63,7 @@ struct cpuidle_state {
/* Idle State Flags */
#define CPUIDLE_FLAG_NONE (0x00)
+#define CPUIDLE_FLAG_POLLING (0x01) /* polling state */
#define CPUIDLE_FLAG_COUPLED (0x02) /* state applies to multiple cpus */
#define CPUIDLE_FLAG_TIMER_STOP (0x04) /* timer is stopped on this state */
@@ -250,12 +251,6 @@ static inline int cpuidle_register_governor(struct cpuidle_governor *gov)
{return 0;}
#endif
-#ifdef CONFIG_ARCH_HAS_CPU_RELAX
-#define CPUIDLE_DRIVER_STATE_START 1
-#else
-#define CPUIDLE_DRIVER_STATE_START 0
-#endif
-
#define CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx) \
({ \
int __ret; \