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jump_label: Do not use unserialized static_key_enabled()

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Any use of key->enabled (that is static_key_enabled and static_key_count)
outside jump_label_lock should handle its own serialization.  The only
two that are not doing so are the UDP encapsulation static keys.  Change
them to use static_key_enable, which now correctly tests key->enabled under
the jump label lock.

Signed-off-by: Paolo Bonzini <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Jason Baron <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Paolo Bonzini 2017-08-01 17:24:05 +02:00 • committed by Ingo Molnar
commit 7a34bcb8b2
3 changed files with 7 additions and 4 deletions
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5
Documentation/static-keys.txt
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@ -149,6 +149,11 @@ static_branch_inc(), will change the branch back to true. Likewise, if the
key is initialized false, a 'static_branch_inc()', will change the branch to
true. And then a 'static_branch_dec()', will again make the branch false.
The state and the reference count can be retrieved with 'static_key_enabled()'
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.
Where an array of keys is required, it can be defined as::
DEFINE_STATIC_KEY_ARRAY_TRUE(keys, count);