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jump label: Add jump_label_text_reserved() to reserve jump points

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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>
This commit is contained in:
Jason Baron 2010-09-17 11:09:08 -04:00 • committed by Steven Rostedt
commit 4c3ef6d793
4 changed files with 94 additions and 3 deletions
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8
include/linux/jump_label.h
View file

@ -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