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| author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2011-09-29 20:10:05 +0200 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2011-10-25 20:54:15 +0200 |
| commit | 37348804e0289087d21ae8bff4c0732030a3c6ac (patch) | |
| tree | dacd987e7e2778b30fccc4e580f852d9dcbd83b2 /kernel | |
| parent | stop_machine: make stop_machine safe and efficient to call early (diff) | |
| download | linux-37348804e0289087d21ae8bff4c0732030a3c6ac.tar.xz linux-37348804e0289087d21ae8bff4c0732030a3c6ac.zip | |
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/jump_label.c | 20 |
1 files changed, 8 insertions, 12 deletions
diff --git a/kernel/jump_label.c b/kernel/jump_label.c index a8ce45097f3d..059202d5b77a 100644 --- a/kernel/jump_label.c +++ b/kernel/jump_label.c @@ -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) |