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static_call: Add simple self-test for static calls 

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200818135804.922581202@infradead.org
This commit is contained in:
Peter Zijlstra 2020-08-18 15:57:46 +02:00 committed by Ingo Molnar
parent 1e7e478838
commit f03c412915
2 changed files with 49 additions and 0 deletions
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6
arch/Kconfig
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@ -106,6 +106,12 @@ config STATIC_KEYS_SELFTEST
help help
Boot time self-test of the branch patching code. Boot time self-test of the branch patching code.
config STATIC_CALL_SELFTEST
bool "Static call selftest"
depends on HAVE_STATIC_CALL
help
Boot time self-test of the call patching code.
config OPTPROBES config OPTPROBES
def_bool y def_bool y
depends on KPROBES && HAVE_OPTPROBES depends on KPROBES && HAVE_OPTPROBES

43
kernel/static_call.c
View File

@ -369,3 +369,46 @@ static void __init static_call_init(void)
#endif #endif
} }
early_initcall(static_call_init); early_initcall(static_call_init);
#ifdef CONFIG_STATIC_CALL_SELFTEST
static int func_a(int x)
{
return x+1;
}
static int func_b(int x)
{
return x+2;
}
DEFINE_STATIC_CALL(sc_selftest, func_a);
static struct static_call_data {
int (*func)(int);
int val;
int expect;
} static_call_data [] __initdata = {
{ NULL, 2, 3 },
{ func_b, 2, 4 },
{ func_a, 2, 3 }
};
static int __init test_static_call_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(static_call_data); i++ ) {
struct static_call_data *scd = &static_call_data[i];
if (scd->func)
static_call_update(sc_selftest, scd->func);
WARN_ON(static_call(sc_selftest)(scd->val) != scd->expect);
}
return 0;
}
early_initcall(test_static_call_init);
#endif /* CONFIG_STATIC_CALL_SELFTEST */