From: Steven Rostedt <[email protected]> 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 <[email protected]> Cc: Petr Pavlu <[email protected]> Cc: Sami Tolvanen <[email protected]> Cc: Daniel Gomez <[email protected]> Cc: [email protected] Signed-off-by: Steven Rostedt (Google) <[email protected]> --- include/linux/module.h | 6 ++++++ kernel/module/main.c | 14 ++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/include/linux/module.h b/include/linux/module.h index 23792d5d7b74..9e1f42f03511 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -779,6 +779,8 @@ 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) @@ -891,6 +893,10 @@ 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..ea1fe313fb89 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -3809,6 +3809,20 @@ 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; + + preempt_disable(); + list_for_each_entry_rcu(mod, &modules, list) { + if (mod->state == MODULE_STATE_UNFORMED) + continue; + if (func(mod, data)) + break; + } + preempt_enable(); +} + /** * __module_text_address() - get the module whose code contains an address. * @addr: the address. -- 2.45.2
