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authorLinus Torvalds <torvalds@linux-foundation.org>2017-10-01 21:34:42 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2017-10-01 21:34:42 +0200
commit82513545134453a9150a2177e7a5704dcd604f8e (patch)
treef0ee7dd475a49b695d7d6b091beeba4bc49481a2 /include
parentMerge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/k... (diff)
parentsmp/hotplug: Hotplug state fail injection (diff)
downloadlinux-82513545134453a9150a2177e7a5704dcd604f8e.tar.xz
linux-82513545134453a9150a2177e7a5704dcd604f8e.zip
Merge branch 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull smp/hotplug fixes from Thomas Gleixner: "This addresses the fallout of the new lockdep mechanism which covers completions in the CPU hotplug code. The lockdep splats are false positives, but there is no way to annotate that reliably. The solution is to split the completions for CPU up and down, which requires some reshuffling of the failure rollback handling as well" * 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: smp/hotplug: Hotplug state fail injection smp/hotplug: Differentiate the AP completion between up and down smp/hotplug: Differentiate the AP-work lockdep class between up and down smp/hotplug: Callback vs state-machine consistency smp/hotplug: Rewrite AP state machine core smp/hotplug: Allow external multi-instance rollback smp/hotplug: Add state diagram
Diffstat (limited to 'include')
-rw-r--r--include/linux/cpuhotplug.h21
1 files changed, 20 insertions, 1 deletions
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index f24bfb2b9a2d..6d508767e144 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -3,8 +3,27 @@
#include <linux/types.h>
+/*
+ * CPU-up CPU-down
+ *
+ * BP AP BP AP
+ *
+ * OFFLINE OFFLINE
+ * | ^
+ * v |
+ * BRINGUP_CPU->AP_OFFLINE BRINGUP_CPU <- AP_IDLE_DEAD (idle thread/play_dead)
+ * | AP_OFFLINE
+ * v (IRQ-off) ,---------------^
+ * AP_ONLNE | (stop_machine)
+ * | TEARDOWN_CPU <- AP_ONLINE_IDLE
+ * | ^
+ * v |
+ * AP_ACTIVE AP_ACTIVE
+ */
+
enum cpuhp_state {
- CPUHP_OFFLINE,
+ CPUHP_INVALID = -1,
+ CPUHP_OFFLINE = 0,
CPUHP_CREATE_THREADS,
CPUHP_PERF_PREPARE,
CPUHP_PERF_X86_PREPARE,