locking/static_keys: Add selftest
Add a little selftest that validates all combinations. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -71,6 +71,12 @@ config JUMP_LABEL
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( On 32-bit x86, the necessary options added to the compiler
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flags may increase the size of the kernel slightly. )
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config STATIC_KEYS_SELFTEST
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bool "Static key selftest"
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depends on JUMP_LABEL
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help
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Boot time self-test of the branch patching code.
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config OPTPROBES
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def_bool y
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depends on KPROBES && HAVE_OPTPROBES
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@ -482,4 +482,41 @@ static void jump_label_update(struct static_key *key)
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__jump_label_update(key, entry, stop);
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}
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#endif
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#ifdef CONFIG_STATIC_KEYS_SELFTEST
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static DEFINE_STATIC_KEY_TRUE(sk_true);
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static DEFINE_STATIC_KEY_FALSE(sk_false);
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static __init int jump_label_test(void)
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{
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int i;
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for (i = 0; i < 2; i++) {
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WARN_ON(static_key_enabled(&sk_true.key) != true);
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WARN_ON(static_key_enabled(&sk_false.key) != false);
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WARN_ON(!static_branch_likely(&sk_true));
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WARN_ON(!static_branch_unlikely(&sk_true));
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WARN_ON(static_branch_likely(&sk_false));
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WARN_ON(static_branch_unlikely(&sk_false));
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static_branch_disable(&sk_true);
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static_branch_enable(&sk_false);
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WARN_ON(static_key_enabled(&sk_true.key) == true);
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WARN_ON(static_key_enabled(&sk_false.key) == false);
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WARN_ON(static_branch_likely(&sk_true));
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WARN_ON(static_branch_unlikely(&sk_true));
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WARN_ON(!static_branch_likely(&sk_false));
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WARN_ON(!static_branch_unlikely(&sk_false));
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static_branch_enable(&sk_true);
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static_branch_disable(&sk_false);
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}
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return 0;
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}
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late_initcall(jump_label_test);
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#endif /* STATIC_KEYS_SELFTEST */
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#endif /* HAVE_JUMP_LABEL */
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