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jump_label: Free jump_entry::key bit1 for build use

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Have jump_label_init() set jump_entry::key bit1 to either 0 ot 1
unconditionally. This makes it available for build-time games.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210506194157.906893264@infradead.org
This commit is contained in:
Peter Zijlstra 2021-05-06 21:34:00 +02:00 committed by Ingo Molnar
parent 001951bea7
commit 5af0ea293d
2 changed files with 11 additions and 6 deletions
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7
include/linux/jump_label.h
View File

@ -171,9 +171,12 @@ static inline bool jump_entry_is_init(const struct jump_entry *entry)
return (unsigned long)entry->key & 2UL; return (unsigned long)entry->key & 2UL;
} }
static inline void jump_entry_set_init(struct jump_entry *entry) static inline void jump_entry_set_init(struct jump_entry *entry, bool set)
{ {
entry->key |= 2; if (set)
entry->key |= 2;
else
entry->key &= ~2;
} }
static inline int jump_entry_size(struct jump_entry *entry) static inline int jump_entry_size(struct jump_entry *entry)

10
kernel/jump_label.c
View File

@ -483,13 +483,14 @@ void __init jump_label_init(void)
for (iter = iter_start; iter < iter_stop; iter++) { for (iter = iter_start; iter < iter_stop; iter++) {
struct static_key *iterk; struct static_key *iterk;
bool in_init;
/* rewrite NOPs */ /* rewrite NOPs */
if (jump_label_type(iter) == JUMP_LABEL_NOP) if (jump_label_type(iter) == JUMP_LABEL_NOP)
arch_jump_label_transform_static(iter, JUMP_LABEL_NOP); arch_jump_label_transform_static(iter, JUMP_LABEL_NOP);
if (init_section_contains((void *)jump_entry_code(iter), 1)) in_init = init_section_contains((void *)jump_entry_code(iter), 1);
jump_entry_set_init(iter); jump_entry_set_init(iter, in_init);
iterk = jump_entry_key(iter); iterk = jump_entry_key(iter);
if (iterk == key) if (iterk == key)
@ -634,9 +635,10 @@ static int jump_label_add_module(struct module *mod)
for (iter = iter_start; iter < iter_stop; iter++) { for (iter = iter_start; iter < iter_stop; iter++) {
struct static_key *iterk; struct static_key *iterk;
bool in_init;
if (within_module_init(jump_entry_code(iter), mod)) in_init = within_module_init(jump_entry_code(iter), mod);
jump_entry_set_init(iter); jump_entry_set_init(iter, in_init);
iterk = jump_entry_key(iter); iterk = jump_entry_key(iter);
if (iterk == key) if (iterk == key)