From 2a442c9c6453d3d043dfd89f2e03a1deff8a6f06 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Wed, 25 Feb 2015 11:42:15 -0800 Subject: x86: Use common outgoing-CPU-notification code This commit removes the open-coded CPU-offline notification with new common code. Among other things, this change avoids calling scheduler code using RCU from an offline CPU that RCU is ignoring. It also allows Xen to notice at online time that the CPU did not go offline correctly. Note that Xen has the surviving CPU carry out some cleanup operations, so if the surviving CPU times out, these cleanup operations might have been carried out while the outgoing CPU was still running. It might therefore be unwise to bring this CPU back online, and this commit avoids doing so. Signed-off-by: Boris Ostrovsky Signed-off-by: Paul E. McKenney Cc: Cc: Konrad Rzeszutek Wilk Cc: David Vrabel Cc: --- arch/x86/include/asm/cpu.h | 2 -- arch/x86/include/asm/smp.h | 2 +- 2 files changed, 1 insertion(+), 3 deletions(-) (limited to 'arch/x86/include') diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h index d2b12988d2ed..bf2caa1dedc5 100644 --- a/arch/x86/include/asm/cpu.h +++ b/arch/x86/include/asm/cpu.h @@ -34,8 +34,6 @@ extern int _debug_hotplug_cpu(int cpu, int action); #endif #endif -DECLARE_PER_CPU(int, cpu_state); - int mwait_usable(const struct cpuinfo_x86 *); #endif /* _ASM_X86_CPU_H */ diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h index 8cd1cc3bc835..a5cb4f6e9492 100644 --- a/arch/x86/include/asm/smp.h +++ b/arch/x86/include/asm/smp.h @@ -150,12 +150,12 @@ static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask) } void cpu_disable_common(void); -void cpu_die_common(unsigned int cpu); void native_smp_prepare_boot_cpu(void); void native_smp_prepare_cpus(unsigned int max_cpus); void native_smp_cpus_done(unsigned int max_cpus); int native_cpu_up(unsigned int cpunum, struct task_struct *tidle); int native_cpu_disable(void); +int common_cpu_die(unsigned int cpu); void native_cpu_die(unsigned int cpu); void native_play_dead(void); void play_dead_common(void); -- cgit v1.2.3