mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-10 02:29:01 +00:00
0276ebf166
commit e9666d10a5
upstream.
Currently, CONFIG_JUMP_LABEL just means "I _want_ to use jump label".
The jump label is controlled by HAVE_JUMP_LABEL, which is defined
like this:
#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
# define HAVE_JUMP_LABEL
#endif
We can improve this by testing 'asm goto' support in Kconfig, then
make JUMP_LABEL depend on CC_HAS_ASM_GOTO.
Ugly #ifdef HAVE_JUMP_LABEL will go away, and CONFIG_JUMP_LABEL will
match to the real kernel capability.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
[nc: Fix trivial conflicts in 4.19
arch/xtensa/kernel/jump_label.c doesn't exist yet
Ensured CC_HAVE_ASM_GOTO and HAVE_JUMP_LABEL were sufficiently
eliminated]
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_JUMP_LABEL_RATELIMIT_H
|
|
#define _LINUX_JUMP_LABEL_RATELIMIT_H
|
|
|
|
#include <linux/jump_label.h>
|
|
#include <linux/workqueue.h>
|
|
|
|
#if defined(CONFIG_JUMP_LABEL)
|
|
struct static_key_deferred {
|
|
struct static_key key;
|
|
unsigned long timeout;
|
|
struct delayed_work work;
|
|
};
|
|
|
|
extern void static_key_slow_dec_deferred(struct static_key_deferred *key);
|
|
extern void static_key_deferred_flush(struct static_key_deferred *key);
|
|
extern void
|
|
jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);
|
|
|
|
#else /* !CONFIG_JUMP_LABEL */
|
|
struct static_key_deferred {
|
|
struct static_key key;
|
|
};
|
|
static inline void static_key_slow_dec_deferred(struct static_key_deferred *key)
|
|
{
|
|
STATIC_KEY_CHECK_USE(key);
|
|
static_key_slow_dec(&key->key);
|
|
}
|
|
static inline void static_key_deferred_flush(struct static_key_deferred *key)
|
|
{
|
|
STATIC_KEY_CHECK_USE(key);
|
|
}
|
|
static inline void
|
|
jump_label_rate_limit(struct static_key_deferred *key,
|
|
unsigned long rl)
|
|
{
|
|
STATIC_KEY_CHECK_USE(key);
|
|
}
|
|
#endif /* CONFIG_JUMP_LABEL */
|
|
#endif /* _LINUX_JUMP_LABEL_RATELIMIT_H */
|