Commit 1987c947 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar

locking/static_keys: Add selftest

Add a little selftest that validates all combinations.
Signed-off-by: default avatarPeter 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: default avatarIngo Molnar <mingo@kernel.org>
parent 11276d53
...@@ -71,6 +71,12 @@ config JUMP_LABEL ...@@ -71,6 +71,12 @@ config JUMP_LABEL
( On 32-bit x86, the necessary options added to the compiler ( On 32-bit x86, the necessary options added to the compiler
flags may increase the size of the kernel slightly. ) flags may increase the size of the kernel slightly. )
config STATIC_KEYS_SELFTEST
bool "Static key selftest"
depends on JUMP_LABEL
help
Boot time self-test of the branch patching code.
config OPTPROBES config OPTPROBES
def_bool y def_bool y
depends on KPROBES && HAVE_OPTPROBES depends on KPROBES && HAVE_OPTPROBES
......
...@@ -482,4 +482,41 @@ static void jump_label_update(struct static_key *key) ...@@ -482,4 +482,41 @@ static void jump_label_update(struct static_key *key)
__jump_label_update(key, entry, stop); __jump_label_update(key, entry, stop);
} }
#endif #ifdef CONFIG_STATIC_KEYS_SELFTEST
static DEFINE_STATIC_KEY_TRUE(sk_true);
static DEFINE_STATIC_KEY_FALSE(sk_false);
static __init int jump_label_test(void)
{
int i;
for (i = 0; i < 2; i++) {
WARN_ON(static_key_enabled(&sk_true.key) != true);
WARN_ON(static_key_enabled(&sk_false.key) != false);
WARN_ON(!static_branch_likely(&sk_true));
WARN_ON(!static_branch_unlikely(&sk_true));
WARN_ON(static_branch_likely(&sk_false));
WARN_ON(static_branch_unlikely(&sk_false));
static_branch_disable(&sk_true);
static_branch_enable(&sk_false);
WARN_ON(static_key_enabled(&sk_true.key) == true);
WARN_ON(static_key_enabled(&sk_false.key) == false);
WARN_ON(static_branch_likely(&sk_true));
WARN_ON(static_branch_unlikely(&sk_true));
WARN_ON(!static_branch_likely(&sk_false));
WARN_ON(!static_branch_unlikely(&sk_false));
static_branch_enable(&sk_true);
static_branch_disable(&sk_false);
}
return 0;
}
late_initcall(jump_label_test);
#endif /* STATIC_KEYS_SELFTEST */
#endif /* HAVE_JUMP_LABEL */
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