The patch titled
hotplug: Allow modules to use the cpu hotplug notifiers even if !CONFIG_HOTPLUG_CPU
has been added to the -mm tree. Its filename is
hotplug-allow-modules-to-use-the-cpu-hotplug-notifiers.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: hotplug: Allow modules to use the cpu hotplug notifiers even if !CONFIG_HOTPLUG_CPU
From: Avi Kivity <avi@xxxxxxxxxxxx>
KVM wants the cpu hotplug notifications, both for cpu hotplug itself, but more
commonly for host suspend/resume.
In order to avoid extensive #ifdefs, provide stubs when CONFIG_CPU_HOTPLUG is
not defined.
In all, we have four cases:
- UP: register and unregister stubbed out
- SMP+hotplug: full register and unregister
- SMP, no hotplug, core: register as __init, unregister stubbed
(cpus are brought up during core initialization)
- SMP, no hotplug, module: register and unregister stubbed out
(cpus cannot be brought up during module lifetime)
Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/cpu.h | 12 +++++++++++-
1 files changed, 11 insertions(+), 1 deletion(-)
diff -puN include/linux/cpu.h~hotplug-allow-modules-to-use-the-cpu-hotplug-notifiers include/linux/cpu.h
--- a/include/linux/cpu.h~hotplug-allow-modules-to-use-the-cpu-hotplug-notifiers
+++ a/include/linux/cpu.h
@@ -49,10 +49,20 @@ struct notifier_block;
#ifdef CONFIG_SMP
/* Need to know about CPUs going up/down? */
-extern int register_cpu_notifier(struct notifier_block *nb);
#ifdef CONFIG_HOTPLUG_CPU
+extern int register_cpu_notifier(struct notifier_block *nb);
extern void unregister_cpu_notifier(struct notifier_block *nb);
#else
+
+#ifndef MODULE
+extern int register_cpu_notifier(struct notifier_block *nb);
+#else
+static inline int register_cpu_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
+#endif
+
static inline void unregister_cpu_notifier(struct notifier_block *nb)
{
}
_
Patches currently in -mm which might be from avi@xxxxxxxxxxxx are
origin.patch
fix-x86_64-mm-convert-i386-pda-code-to-use-%fs.patch
kvm-optimize-inline-assembly.patch
kvm-fix-asm-constraint-for-lldt-instruction.patch
kvm-fix-gva_to_gpa.patch
kvm-vmx-handle-triple-faults-by-returning-exit_reason_shutdown-to-userspace.patch
kvm-fix-mmu-going-crazy-of-guest-sets-cr0wp-==-0.patch
kvm-svm-hack-initial-cpu-csbase-to-be-consistent-with-intel.patch
kvm-two-way-apic-tpr-synchronization.patch
kvm-vmx-reload-ds-and-es-even-in-64-bit-mode.patch
kvm-fix-mismatch-between-32-bit-and-64-bit-abi.patch
kvm-fix-vcpu-freeing-bug.patch
hotplug-allow-modules-to-use-the-cpu-hotplug-notifiers.patch
kvm-add-a-global-list-of-all-virtual-machines.patch
kvm-add-a-global-list-of-all-virtual-machines-tidy.patch
kvm-vmx-add-vcpu_clear.patch
kvm-cpu-hotplug-support.patch
kvm-host-suspend-resume-support.patch
-
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