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| author |   Peter Zijlstra <peterz@infradead.org> | 2021-01-18 15:12:18 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2021-02-17 14:08:35 +0100 |
| commit | 880cfed3a012d7863f42251791cea7fe78c39390 (patch) | |
| tree | 910f0d2ece75eafbd35e939ba78442ba15376fae /include/linux/static_call_types.h | |
| parent | sched/core: Update task_prio() function header (diff) | |
| download | linux-dev-880cfed3a012d7863f42251791cea7fe78c39390.tar.xz linux-dev-880cfed3a012d7863f42251791cea7fe78c39390.zip | |
static_call: Pull some static_call declarations to the type headers
Some static call declarations are going to be needed on low level header
files. Move the necessary material to the dedicated static call types
header to avoid inclusion dependency hell.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20210118141223.123667-4-frederic@kernel.org
Diffstat (limited to 'include/linux/static_call_types.h')
| -rw-r--r-- | include/linux/static_call_types.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/static_call_types.h b/include/linux/static_call_types.h index 89135bb35bf7..08f78b1b88b4 100644 --- a/include/linux/static_call_types.h +++ b/include/linux/static_call_types.h @@ -4,6 +4,7 @@ #include <linux/types.h> #include <linux/stringify.h> +#include <linux/compiler.h> #define STATIC_CALL_KEY_PREFIX __SCK__ #define STATIC_CALL_KEY_PREFIX_STR __stringify(STATIC_CALL_KEY_PREFIX) @@ -32,4 +33,30 @@ struct static_call_site { s32 key; }; +#define DECLARE_STATIC_CALL(name, func) \ + extern struct static_call_key STATIC_CALL_KEY(name); \ + extern typeof(func) STATIC_CALL_TRAMP(name); + +#ifdef CONFIG_HAVE_STATIC_CALL + +/* + * __ADDRESSABLE() is used to ensure the key symbol doesn't get stripped from + * the symbol table so that objtool can reference it when it generates the + * .static_call_sites section. + */ +#define __static_call(name) \ +({ \ + __ADDRESSABLE(STATIC_CALL_KEY(name)); \ + &STATIC_CALL_TRAMP(name); \ +}) + +#define static_call(name) __static_call(name) + +#else + +#define static_call(name) \ + ((typeof(STATIC_CALL_TRAMP(name))*)(STATIC_CALL_KEY(name).func)) + +#endif /* CONFIG_HAVE_STATIC_CALL */ + #endif /* _STATIC_CALL_TYPES_H */ |