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jump_label: Provide hotplug context variants

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As using the normal static key API under the hotplug lock is
pretty much impossible, let's provide a variant of some of them
that require the hotplug lock to have already been taken.

These function are only meant to be used in CPU hotplug callbacks.

Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Marc Zyngier 2017-08-01 09:02:56 +01:00 • committed by Ingo Molnar
commit 5a40527f8f
3 changed files with 42 additions and 6 deletions
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15
Documentation/static-keys.txt
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@ -154,6 +154,21 @@ and 'static_key_count()'. In general, if you use these functions, they
should be protected with the same mutex used around the enable/disable
or increment/decrement function.
Note that switching branches results in some locks being taken,
particularly the CPU hotplug lock (in order to avoid races against
CPUs being brought in the kernel whilst the kernel is getting
patched). Calling the static key API from within a hotplug notifier is
thus a sure deadlock recipe. In order to still allow use of the
functionnality, the following functions are provided:
static_key_enable_cpuslocked()
static_key_disable_cpuslocked()
static_branch_enable_cpuslocked()
static_branch_disable_cpuslocked()
These functions are *not* general purpose, and must only be used when
you really know that you're in the above context, and no other.
Where an array of keys is required, it can be defined as::
DEFINE_STATIC_KEY_ARRAY_TRUE(keys, count);