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| author | Jason Baron <jbaron@redhat.com> | 2010-09-17 11:09:08 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2010-09-22 16:30:46 -0400 |
| commit | 4c3ef6d79328c0e23ade60cbfc8d496123a6855c (patch) | |
| tree | 4a28260548ff4ad507d12716d6cdaa6bc0451a87 /include/linux/jump_label.h | |
| parent | e0cf0cd49632552f063fb3ae58691946da45fb2e (diff) | |
| download | lwn-4c3ef6d79328c0e23ade60cbfc8d496123a6855c.tar.gz lwn-4c3ef6d79328c0e23ade60cbfc8d496123a6855c.zip | |
jump label: Add jump_label_text_reserved() to reserve jump points
Add a jump_label_text_reserved(void *start, void *end), so that other
pieces of code that want to modify kernel text, can first verify that
jump label has not reserved the instruction.
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Jason Baron <jbaron@redhat.com>
LKML-Reference: <06236663a3a7b1c1f13576bb9eccb6d9c17b7bfe.1284733808.git.jbaron@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/jump_label.h')
| -rw-r--r-- | include/linux/jump_label.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h index de58656d28e0..b72cd9f92c2e 100644 --- a/include/linux/jump_label.h +++ b/include/linux/jump_label.h @@ -20,9 +20,10 @@ extern struct jump_entry __stop___jump_table[]; 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); extern void jump_label_update(unsigned long key, enum jump_label_type type); extern void jump_label_apply_nops(struct module *mod); -extern void arch_jump_label_text_poke_early(jump_label_t addr); +extern int jump_label_text_reserved(void *start, void *end); #define enable_jump_label(key) \ jump_label_update((unsigned long)key, JUMP_LABEL_ENABLE); @@ -53,6 +54,11 @@ static inline int jump_label_apply_nops(struct module *mod) return 0; } +static inline int jump_label_text_reserved(void *start, void *end) +{ + return 0; +} + #endif #endif |