Commit e71a5be1 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge

x86/jump_label: add arch_jump_label_transform_static()

This allows jump-label entries to be cheaply updated on code which is
not yet live.
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: default avatarJason Baron <jbaron@redhat.com>
Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
parent 61f42183
...@@ -24,8 +24,9 @@ union jump_code_union { ...@@ -24,8 +24,9 @@ union jump_code_union {
} __attribute__((packed)); } __attribute__((packed));
}; };
void arch_jump_label_transform(struct jump_entry *entry, static void __jump_label_transform(struct jump_entry *entry,
enum jump_label_type type) enum jump_label_type type,
void *(*poker)(void *, const void *, size_t))
{ {
union jump_code_union code; union jump_code_union code;
...@@ -35,11 +36,24 @@ void arch_jump_label_transform(struct jump_entry *entry, ...@@ -35,11 +36,24 @@ void arch_jump_label_transform(struct jump_entry *entry,
(entry->code + JUMP_LABEL_NOP_SIZE); (entry->code + JUMP_LABEL_NOP_SIZE);
} else } else
memcpy(&code, ideal_nops[NOP_ATOMIC5], JUMP_LABEL_NOP_SIZE); memcpy(&code, ideal_nops[NOP_ATOMIC5], JUMP_LABEL_NOP_SIZE);
(*poker)((void *)entry->code, &code, JUMP_LABEL_NOP_SIZE);
}
void arch_jump_label_transform(struct jump_entry *entry,
enum jump_label_type type)
{
get_online_cpus(); get_online_cpus();
mutex_lock(&text_mutex); mutex_lock(&text_mutex);
text_poke_smp((void *)entry->code, &code, JUMP_LABEL_NOP_SIZE); __jump_label_transform(entry, type, text_poke_smp);
mutex_unlock(&text_mutex); mutex_unlock(&text_mutex);
put_online_cpus(); put_online_cpus();
} }
void arch_jump_label_transform_static(struct jump_entry *entry,
enum jump_label_type type)
{
__jump_label_transform(entry, type, text_poke_early);
}
#endif #endif
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