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Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull smp/hotplug updates from Thomas Gleixner:
 "No functional changes, just removal of obsolete and outdated defines,
  macros and documentation"

* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  cpu/hotplug: Get rid of CPU hotplug notifier leftovers
  cpu/hotplug: Remove obsolete notifier macros
This commit is contained in:
Linus Torvalds 2017-11-13 18:23:19 -08:00
commit 7d58e1c905
3 changed files with 14 additions and 55 deletions
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9
Documentation/power/suspend-and-cpuhotplug.txt
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@ -232,7 +232,7 @@ d. Handling microcode update during suspend/hibernate:
hibernate/restore cycle.]
In the current design of the kernel however, during a CPU offline operation
as part of the suspend/hibernate cycle (the CPU_DEAD_FROZEN notification),
as part of the suspend/hibernate cycle (cpuhp_tasks_frozen is set),
the existing copy of microcode image in the kernel is not freed up.
And during the CPU online operations (during resume/restore), since the
kernel finds that it already has copies of the microcode images for all the
@ -252,10 +252,9 @@ Yes, they are listed below:
the _cpu_down() and _cpu_up() functions is *always* 0.
This might not reflect the true current state of the system, since the
tasks could have been frozen by an out-of-band event such as a suspend
operation in progress. Hence, it will lead to wrong notifications being
sent during the cpu online/offline events (eg, CPU_ONLINE notification
instead of CPU_ONLINE_FROZEN) which in turn will lead to execution of
inappropriate code by the callbacks registered for such CPU hotplug events.
operation in progress. Hence, the cpuhp_tasks_frozen variable will not
reflect the frozen state and the CPU hotplug callbacks which evaluate
that variable might execute the wrong code path.
2. If a regular CPU hotplug stress test happens to race with the freezer due
to a suspend operation in progress at the same time, then we could hit the