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jump_label: if a key has already been initialized, don't nop it out 

If a key has been enabled before jump_label_init() is called, don't
nop it out.

This removes arch_jump_label_text_poke_early() (which can only nop
out a site) and uses arch_jump_label_transform() instead.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
This commit is contained in:
Jeremy Fitzhardinge 2011-09-29 11:10:05 -07:00
parent 189c3fd68c
commit 37348804e0
2 changed files with 9 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/jump_label.h
View File

@ -44,8 +44,7 @@ extern struct jump_entry __stop___jump_table[];
extern void jump_label_lock(void);
extern void jump_label_unlock(void);
extern void arch_jump_label_transform(struct jump_entry *entry,
enum jump_label_type type);
extern void arch_jump_label_text_poke_early(jump_label_t addr);
enum jump_label_type type);
extern int jump_label_text_reserved(void *start, void *end);
extern void jump_label_inc(struct jump_label_key *key);
extern void jump_label_dec(struct jump_label_key *key);

20
kernel/jump_label.c
View File

@ -121,13 +121,6 @@ static void __jump_label_update(struct jump_label_key *key,
}
}
/*
* Not all archs need this.
*/
void __weak arch_jump_label_text_poke_early(jump_label_t addr)
{
}
static __init int jump_label_init(void)
{
struct jump_entry *iter_start = __start___jump_table;
@ -139,12 +132,15 @@ static __init int jump_label_init(void)
jump_label_sort_entries(iter_start, iter_stop);
for (iter = iter_start; iter < iter_stop; iter++) {
arch_jump_label_text_poke_early(iter->code);
if (iter->key == (jump_label_t)(unsigned long)key)
struct jump_label_key *iterk;
iterk = (struct jump_label_key *)(unsigned long)iter->key;
arch_jump_label_transform(iter, jump_label_enabled(iterk) ?
JUMP_LABEL_ENABLE : JUMP_LABEL_DISABLE);
if (iterk == key)
continue;
key = (struct jump_label_key *)(unsigned long)iter->key;
atomic_set(&key->enabled, 0);
key = iterk;
key->entries = iter;
#ifdef CONFIG_MODULES
key->next = NULL;
@ -212,7 +208,7 @@ void jump_label_apply_nops(struct module *mod)
return;
for (iter = iter_start; iter < iter_stop; iter++)
arch_jump_label_text_poke_early(iter->code);
arch_jump_label_transform(iter, JUMP_LABEL_DISABLE);
}
static int jump_label_add_module(struct module *mod)