Messages in this thread Patch in this message | | | Date | Tue, 18 Aug 2020 15:57:46 +0200 | From | Peter Zijlstra <> | Subject | [PATCH v7 11/18] static_call: Simple self-test |
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Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> --- arch/Kconfig | 6 ++++++ kernel/static_call.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 49 insertions(+)
--- a/arch/Kconfig +++ b/arch/Kconfig @@ -103,6 +103,12 @@ config STATIC_KEYS_SELFTEST help 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 def_bool y depends on KPROBES && HAVE_OPTPROBES --- a/kernel/static_call.c +++ b/kernel/static_call.c @@ -365,3 +365,46 @@ static void __init static_call_init(void #endif } 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 */
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