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authorLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2015-01-26 21:33:44 +0300
committerCatalin Marinas <catalin.marinas@arm.com>2015-01-27 14:35:33 +0300
commitaf3cfdbf56b91785650f54e7c9a899d814b4b9fb (patch)
treed3f8f97239085af0b605ad945812ac198f3d18ca /arch/arm64/include/asm/cpuidle.h
parentc623b33b4e9599c6ac5076f7db7369eb9869aa04 (diff)
downloadlinux-af3cfdbf56b91785650f54e7c9a899d814b4b9fb.tar.xz
arm64: kernel: remove ARM64_CPU_SUSPEND config option
ARM64_CPU_SUSPEND config option was introduced to make code providing context save/restore selectable only on platforms requiring power management capabilities. Currently ARM64_CPU_SUSPEND depends on the PM_SLEEP config option which in turn is set by the SUSPEND config option. The introduction of CPU_IDLE for arm64 requires that code configured by ARM64_CPU_SUSPEND (context save/restore) should be compiled in in order to enable the CPU idle driver to rely on CPU operations carrying out context save/restore. The ARM64_CPUIDLE config option (ARM64 generic idle driver) is therefore forced to select ARM64_CPU_SUSPEND, even if there may be (ie PM_SLEEP) failed dependencies, which is not a clean way of handling the kernel configuration option. For these reasons, this patch removes the ARM64_CPU_SUSPEND config option and makes the context save/restore dependent on CPU_PM, which is selected whenever either SUSPEND or CPU_IDLE are configured, cleaning up dependencies in the process. This way, code previously configured through ARM64_CPU_SUSPEND is compiled in whenever a power management subsystem requires it to be present in the kernel (SUSPEND || CPU_IDLE), which is the behaviour expected on ARM64 kernels. The cpu_suspend and cpu_init_idle CPU operations are added only if CPU_IDLE is selected, since they are CPU_IDLE specific methods and should be grouped and defined accordingly. PSCI CPU operations are updated to reflect the introduced changes. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Will Deacon <will.deacon@arm.com> Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cpuidle.h')
-rw-r--r--arch/arm64/include/asm/cpuidle.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpuidle.h b/arch/arm64/include/asm/cpuidle.h
index b52a9932e2b1..0710654631e7 100644
--- a/arch/arm64/include/asm/cpuidle.h
+++ b/arch/arm64/include/asm/cpuidle.h
@@ -3,11 +3,17 @@
#ifdef CONFIG_CPU_IDLE
extern int cpu_init_idle(unsigned int cpu);
+extern int cpu_suspend(unsigned long arg);
#else
static inline int cpu_init_idle(unsigned int cpu)
{
return -EOPNOTSUPP;
}
+
+static inline int cpu_suspend(unsigned long arg)
+{
+ return -EOPNOTSUPP;
+}
#endif
#endif