diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2020-08-18 15:57:51 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-09-01 09:58:06 +0200 |
| commit | a945c8345ec0decb2f1a7f19a8c5e60bcb1dd1eb (patch) | |
| tree | 11d4ff482c11945ef30fe5c88493a2b49202ad27 /include/linux/static_call.h | |
| parent | 6c3fce794e9d2a5ce3a948962d0808a459c40a84 (diff) | |
static_call: Allow early init
In order to use static_call() to wire up x86_pmu, we need to
initialize earlier, specifically before memory allocation works; copy
some of the tricks from jump_label to enable this.
Primarily we overload key->next to store a sites pointer when there
are no modules, this avoids having to use kmalloc() to initialize the
sites and allows us to run much earlier.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20200818135805.220737930@infradead.org
Diffstat (limited to 'include/linux/static_call.h')
| -rw-r--r-- | include/linux/static_call.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/include/linux/static_call.h b/include/linux/static_call.h index 519bd666e096..bfa2ba39be57 100644 --- a/include/linux/static_call.h +++ b/include/linux/static_call.h @@ -136,6 +136,8 @@ extern void arch_static_call_transform(void *site, void *tramp, void *func, bool #ifdef CONFIG_HAVE_STATIC_CALL_INLINE +extern void __init static_call_init(void); + struct static_call_mod { struct static_call_mod *next; struct module *mod; /* for vmlinux, mod == NULL */ @@ -144,7 +146,12 @@ struct static_call_mod { struct static_call_key { void *func; - struct static_call_mod *mods; + union { + /* bit 0: 0 = mods, 1 = sites */ + unsigned long type; + struct static_call_mod *mods; + struct static_call_site *sites; + }; }; extern void __static_call_update(struct static_call_key *key, void *tramp, void *func); @@ -155,7 +162,7 @@ extern int static_call_text_reserved(void *start, void *end); DECLARE_STATIC_CALL(name, _func); \ struct static_call_key STATIC_CALL_KEY(name) = { \ .func = _func, \ - .mods = NULL, \ + .type = 1, \ }; \ ARCH_DEFINE_STATIC_CALL_TRAMP(name, _func) @@ -180,6 +187,8 @@ extern int static_call_text_reserved(void *start, void *end); #elif defined(CONFIG_HAVE_STATIC_CALL) +static inline void static_call_init(void) { } + struct static_call_key { void *func; }; @@ -225,6 +234,8 @@ static inline int static_call_text_reserved(void *start, void *end) #else /* Generic implementation */ +static inline void static_call_init(void) { } + struct static_call_key { void *func; }; |