diff options
author | Rusty Russell <rusty@rustcorp.com.au> | 2007-07-15 23:41:46 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-16 09:05:51 -0700 |
commit | 24da1cbff9cfce50868c2dfdcda82a68ac5cb707 (patch) | |
tree | 93f0e1f0f464d62b73b14fba4a2ab9216acdc924 /kernel | |
parent | 6c675bd43ccc36927c855d53d2e0042cdd1074ab (diff) | |
download | linux-24da1cbff9cfce50868c2dfdcda82a68ac5cb707.tar.bz2 |
modules: remove modlist_lock
Now we always use stop_machine for module insertion or deletion, we no
longer need the modlist_lock: merely disabling preemption is sufficient to
block against list manipulation. This avoids deadlock on OOPSen where we
can potentially grab the lock twice.
Bug: 8695
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Tobias Oed <tobiasoed@hotmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/module.c | 36 |
1 files changed, 15 insertions, 21 deletions
diff --git a/kernel/module.c b/kernel/module.c index 7a1a4d3558d5..539fed9ac83c 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -61,10 +61,8 @@ extern int module_sysfs_initialized; /* If this is set, the section belongs in the init part of the module */ #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) -/* Protects module list */ -static DEFINE_SPINLOCK(modlist_lock); - -/* List of modules, protected by module_mutex AND modlist_lock */ +/* List of modules, protected by module_mutex or preempt_disable + * (add/delete uses stop_machine). */ static DEFINE_MUTEX(module_mutex); static LIST_HEAD(modules); @@ -760,14 +758,13 @@ static void print_unload_info(struct seq_file *m, struct module *mod) void __symbol_put(const char *symbol) { struct module *owner; - unsigned long flags; const unsigned long *crc; - spin_lock_irqsave(&modlist_lock, flags); + preempt_disable(); if (!__find_symbol(symbol, &owner, &crc, 1)) BUG(); module_put(owner); - spin_unlock_irqrestore(&modlist_lock, flags); + preempt_enable(); } EXPORT_SYMBOL(__symbol_put); @@ -1228,14 +1225,14 @@ static void free_module(struct module *mod) void *__symbol_get(const char *symbol) { struct module *owner; - unsigned long value, flags; + unsigned long value; const unsigned long *crc; - spin_lock_irqsave(&modlist_lock, flags); + preempt_disable(); value = __find_symbol(symbol, &owner, &crc, 1); if (value && !strong_try_module_get(owner)) value = 0; - spin_unlock_irqrestore(&modlist_lock, flags); + preempt_enable(); return (void *)value; } @@ -2308,11 +2305,10 @@ const struct seq_operations modules_op = { /* Given an address, look for it in the module exception tables. */ const struct exception_table_entry *search_module_extables(unsigned long addr) { - unsigned long flags; const struct exception_table_entry *e = NULL; struct module *mod; - spin_lock_irqsave(&modlist_lock, flags); + preempt_disable(); list_for_each_entry(mod, &modules, list) { if (mod->num_exentries == 0) continue; @@ -2323,7 +2319,7 @@ const struct exception_table_entry *search_module_extables(unsigned long addr) if (e) break; } - spin_unlock_irqrestore(&modlist_lock, flags); + preempt_enable(); /* Now, if we found one, we are running inside it now, hence we cannot unload the module, hence no refcnt needed. */ @@ -2335,25 +2331,24 @@ const struct exception_table_entry *search_module_extables(unsigned long addr) */ int is_module_address(unsigned long addr) { - unsigned long flags; struct module *mod; - spin_lock_irqsave(&modlist_lock, flags); + preempt_disable(); list_for_each_entry(mod, &modules, list) { if (within(addr, mod->module_core, mod->core_size)) { - spin_unlock_irqrestore(&modlist_lock, flags); + preempt_enable(); return 1; } } - spin_unlock_irqrestore(&modlist_lock, flags); + preempt_enable(); return 0; } -/* Is this a valid kernel address? We don't grab the lock: we are oopsing. */ +/* Is this a valid kernel address? */ struct module *__module_text_address(unsigned long addr) { struct module *mod; @@ -2368,11 +2363,10 @@ struct module *__module_text_address(unsigned long addr) struct module *module_text_address(unsigned long addr) { struct module *mod; - unsigned long flags; - spin_lock_irqsave(&modlist_lock, flags); + preempt_disable(); mod = __module_text_address(addr); - spin_unlock_irqrestore(&modlist_lock, flags); + preempt_enable(); return mod; } |