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| author | Toshi Kani <toshi.kani@hp.com> | 2013-08-29 18:22:08 -0600 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-09-25 10:38:10 +0200 |
| commit | 1cad5e9a3978d182aa9b0e909fb0379da5ba45af (patch) | |
| tree | 916fbefe6615aebaba6f7093b205e2f2d95f3c91 /arch | |
| parent | 574b851e99923c884fee4e0d7cf7e7c3dc023ffa (diff) | |
| download | blackbird-op-linux-1cad5e9a3978d182aa9b0e909fb0379da5ba45af.tar.gz blackbird-op-linux-1cad5e9a3978d182aa9b0e909fb0379da5ba45af.zip | |
hotplug / x86: Disable ARCH_CPU_PROBE_RELEASE on x86
Commit d7c53c9e enabled ARCH_CPU_PROBE_RELEASE on x86 in order to
serialize CPU online/offline operations. Although it is the config
option to enable CPU hotplug test interfaces, probe & release, it is
also the option to enable cpu_hotplug_driver_lock() as well. Therefore,
this option had to be enabled on x86 with dummy arch_cpu_probe() and
arch_cpu_release().
Since then, lock_device_hotplug() was introduced to serialize CPU
online/offline & hotplug operations. Therefore, this config option
is no longer required for the serialization. This patch disables
this config option on x86 and revert the changes made by commit
d7c53c9e.
Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/Kconfig | 4 | ||||
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 21 |
2 files changed, 0 insertions, 25 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index ee2fb9d37745..dcdb5130cf85 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -254,10 +254,6 @@ config ARCH_HWEIGHT_CFLAGS default "-fcall-saved-ecx -fcall-saved-edx" if X86_32 default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64 -config ARCH_CPU_PROBE_RELEASE - def_bool y - depends on HOTPLUG_CPU - config ARCH_SUPPORTS_UPROBES def_bool y diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 6cacab671f9b..e73b3f53310c 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -82,27 +82,6 @@ /* State of each CPU */ DEFINE_PER_CPU(int, cpu_state) = { 0 }; -#ifdef CONFIG_HOTPLUG_CPU -/* - * We need this for trampoline_base protection from concurrent accesses when - * off- and onlining cores wildly. - */ -static DEFINE_MUTEX(x86_cpu_hotplug_driver_mutex); - -void cpu_hotplug_driver_lock(void) -{ - mutex_lock(&x86_cpu_hotplug_driver_mutex); -} - -void cpu_hotplug_driver_unlock(void) -{ - mutex_unlock(&x86_cpu_hotplug_driver_mutex); -} - -ssize_t arch_cpu_probe(const char *buf, size_t count) { return -1; } -ssize_t arch_cpu_release(const char *buf, size_t count) { return -1; } -#endif - /* Number of siblings per CPU package */ int smp_num_siblings = 1; EXPORT_SYMBOL(smp_num_siblings); |
