Commit 966b7d0e authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt (Google)
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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: default avatarPetr Pavlu <petr.pavlu@suse.com>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent b6533482

include/linux/module.h

+6 −0
Original line number Diff line number Diff line
@@ -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

kernel/module/main.c

+13 −0
Original line number Diff line number Diff line
@@ -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.