diff options
| author | Steven Rostedt <rostedt@goodmis.org> | 2025-03-05 11:45:44 -0500 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2025-03-28 08:39:27 -0400 |
| commit | 966b7d0e524da03a18ba1b111d0fa0d81e840f77 (patch) | |
| tree | 497f61b2e7a5a7a76813da36a5d60db7006e3453 | |
| parent | b65334825fb14cae15e93d627c3cfc2986c7eea6 (diff) | |
| download | linux-966b7d0e524da03a18ba1b111d0fa0d81e840f77.tar.gz linux-966b7d0e524da03a18ba1b111d0fa0d81e840f77.tar.bz2 linux-966b7d0e524da03a18ba1b111d0fa0d81e840f77.zip | |
module: Add module_for_each_mod() function
The tracing system needs a way to save all the currently loaded modules
and their addresses into persistent memory so that it can evaluate the
addresses on a reboot from a crash. When the persistent memory trace
starts, it will load the module addresses and names into the persistent
memory. To do so, it will call the module_for_each_mod() function and pass
it a function and data structure to get called on each loaded module. Then
it can record the memory.
This only implements that function.
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Sami Tolvanen <samitolvanen@google.com>
Cc: Daniel Gomez <da.gomez@samsung.com>
Cc: linux-modules@vger.kernel.org
Link: https://lore.kernel.org/20250305164608.962615966@goodmis.org
Acked-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
| -rw-r--r-- | include/linux/module.h | 6 | ||||
| -rw-r--r-- | kernel/module/main.c | 13 |
2 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/module.h b/include/linux/module.h index 30e5b19bafa9..9a71dd2cb11f 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -782,6 +782,8 @@ static inline void *module_writable_address(struct module *mod, void *loc) return __module_writable_address(mod, loc); } +void module_for_each_mod(int(*func)(struct module *mod, void *data), void *data); + #else /* !CONFIG_MODULES... */ static inline struct module *__module_address(unsigned long addr) @@ -894,6 +896,10 @@ static inline void *module_writable_address(struct module *mod, void *loc) { return loc; } + +static inline void module_for_each_mod(int(*func)(struct module *mod, void *data), void *data) +{ +} #endif /* CONFIG_MODULES */ #ifdef CONFIG_SYSFS diff --git a/kernel/module/main.c b/kernel/module/main.c index 1fb9ad289a6f..927a2e0ffd5f 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -3809,6 +3809,19 @@ bool is_module_text_address(unsigned long addr) return ret; } +void module_for_each_mod(int(*func)(struct module *mod, void *data), void *data) +{ + struct module *mod; + + guard(rcu)(); + list_for_each_entry_rcu(mod, &modules, list) { + if (mod->state == MODULE_STATE_UNFORMED) + continue; + if (func(mod, data)) + break; + } +} + /** * __module_text_address() - get the module whose code contains an address. * @addr: the address. |