[PATCH v2 01/14] smp: Create a new function to shutdown nonboot cpus
From: Qais Yousef <hidden>
Date: 2019-11-25 11:28:09
Also in:
lkml
Subsystem:
cpu hotplug, the rest · Maintainers:
Thomas Gleixner, Peter Zijlstra, Linus Torvalds
This function will be used later in machine_shutdown() for some archs. Signed-off-by: Qais Yousef <redacted> CC: Thomas Gleixner <redacted> CC: Josh Poimboeuf <redacted> CC: "Peter Zijlstra (Intel)" <peterz@infradead.org> CC: Jiri Kosina <redacted> CC: Nicholas Piggin <npiggin@gmail.com> CC: Daniel Lezcano <redacted> CC: Ingo Molnar <mingo@kernel.org> CC: Eiichi Tsukata <redacted> CC: Zhenzhong Duan <redacted> CC: Nadav Amit <redacted> CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org> CC: "Rafael J. Wysocki" <redacted> CC: Tony Luck <tony.luck@intel.com> CC: Fenghua Yu <redacted> CC: Russell King <linux@armlinux.org.uk> CC: Catalin Marinas <catalin.marinas@arm.com> CC: Will Deacon <will@kernel.org> CC: linux-arm-kernel@lists.infradead.org CC: linux-ia64@vger.kernel.org CC: linux-kernel@vger.kernel.org --- include/linux/cpu.h | 2 ++ kernel/cpu.c | 17 +++++++++++++++++ 2 files changed, 19 insertions(+)
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index bc6c879bd110..8229932fb053 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h@@ -118,6 +118,7 @@ extern void cpu_hotplug_disable(void); extern void cpu_hotplug_enable(void); void clear_tasks_mm_cpumask(int cpu); int cpu_down(unsigned int cpu); +extern void smp_shutdown_nonboot_cpus(unsigned int primary_cpu); #else /* CONFIG_HOTPLUG_CPU */
@@ -129,6 +130,7 @@ static inline int cpus_read_trylock(void) { return true; } static inline void lockdep_assert_cpus_held(void) { } static inline void cpu_hotplug_disable(void) { } static inline void cpu_hotplug_enable(void) { } +static inline void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) { } #endif /* !CONFIG_HOTPLUG_CPU */ /* Wrappers which go away once all code is converted */
diff --git a/kernel/cpu.c b/kernel/cpu.c
index e2cad3ee2ead..94055a0d989e 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c@@ -1058,6 +1058,23 @@ int cpu_down(unsigned int cpu) } EXPORT_SYMBOL(cpu_down); +void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) +{ + unsigned int cpu; + + if (!cpu_online(primary_cpu)) { + pr_info("Attempting to shutdodwn nonboot cpus while boot cpu is offline!\n"); + cpu_online(primary_cpu); + } + + for_each_present_cpu(cpu) { + if (cpu == primary_cpu) + continue; + if (cpu_online(cpu)) + cpu_down(cpu); + } +} + #else #define takedown_cpu NULL #endif /*CONFIG_HOTPLUG_CPU*/
--
2.17.1
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