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[PATCH] lockdep: add is_module_address()

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Add is_module_address() method - to be used by lockdep.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-07-03 00:24:24 -07:00 committed by Linus Torvalds
parent 93e028148f
commit 4d435f9d8f
2 changed files with 29 additions and 0 deletions
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6
include/linux/module.h
View file

@ -358,6 +358,7 @@ static inline int module_is_live(struct module *mod)
/* Is this address in a module? (second is with no locks, for oops) */
struct module *module_text_address(unsigned long addr);
struct module *__module_text_address(unsigned long addr);
int is_module_address(unsigned long addr);
/* Returns module and fills in value, defined and namebuf, or NULL if
symnum out of range. */
@ -496,6 +497,11 @@ static inline struct module *__module_text_address(unsigned long addr)
return NULL;
}
static inline int is_module_address(unsigned long addr)
{
return 0;
}
/* Get/put a kernel symbol (calls should be symmetric) */
#define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
#define symbol_put(x) do { } while(0)

23
kernel/module.c
View file

@ -2159,6 +2159,29 @@ const struct exception_table_entry *search_module_extables(unsigned long addr)
return e;
}
/*
* Is this a valid module address?
*/
int is_module_address(unsigned long addr)
{
unsigned long flags;
struct module *mod;
spin_lock_irqsave(&modlist_lock, flags);
list_for_each_entry(mod, &modules, list) {
if (within(addr, mod->module_core, mod->core_size)) {
spin_unlock_irqrestore(&modlist_lock, flags);
return 1;
}
}
spin_unlock_irqrestore(&modlist_lock, flags);
return 0;
}
/* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
struct module *__module_text_address(unsigned long addr)
{