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module: Add module_for_each_mod() function

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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>
This commit is contained in:
Steven Rostedt 2025-03-05 11:45:44 -05:00 committed by Steven Rostedt (Google)
parent b65334825f
commit 966b7d0e52
2 changed files with 19 additions and 0 deletions
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6
include/linux/module.h
View File

@ -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

13
kernel/module/main.c
View File

@ -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.