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timer: Remove redundant __setup_timer*() macros

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With __init_timer*() now matching __setup_timer*(), remove the redundant
internal interface, clean up the resulting definitions and add more
documentation.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tejun Heo <tj@kernel.org>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Shaohua Li <shli@fb.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook
2017-10-22 18:48:43 -07:00
parent 188665b2d6
commit 919b250f85
3 changed files with 31 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

60
include/linux/timer.h
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@@ -78,6 +78,9 @@ struct timer_list {
struct timer_list _name = \
__TIMER_INITIALIZER((TIMER_FUNC_TYPE)_function, 0)
/*
* LOCKDEP and DEBUG timer interfaces.
*/
void init_timer_key(struct timer_list *timer,
void (*func)(struct timer_list *), unsigned int flags,
const char *name, struct lock_class_key *key);
@@ -87,9 +90,7 @@ extern void init_timer_on_stack_key(struct timer_list *timer,
void (*func)(struct timer_list *),
unsigned int flags, const char *name,
struct lock_class_key *key);
extern void destroy_timer_on_stack(struct timer_list *timer);
#else
static inline void destroy_timer_on_stack(struct timer_list *timer) { }
static inline void init_timer_on_stack_key(struct timer_list *timer,
void (*func)(struct timer_list *),
unsigned int flags,
@@ -120,43 +121,26 @@ static inline void init_timer_on_stack_key(struct timer_list *timer,
init_timer_on_stack_key((_timer), (_fn), (_flags), NULL, NULL)
#endif
#define __setup_timer(_timer, _fn, _flags) \
do { \
__init_timer((_timer), (_fn), (_flags)); \
} while (0)
#define __setup_timer_on_stack(_timer, _fn, _flags) \
do { \
__init_timer_on_stack((_timer), (_fn), (_flags)); \
} while (0)
#ifndef CONFIG_LOCKDEP
static inline void timer_setup(struct timer_list *timer,
void (*callback)(struct timer_list *),
unsigned int flags)
{
__setup_timer(timer, (TIMER_FUNC_TYPE)callback, flags);
}
static inline void timer_setup_on_stack(struct timer_list *timer,
void (*callback)(struct timer_list *),
unsigned int flags)
{
__setup_timer_on_stack(timer, (TIMER_FUNC_TYPE)callback, flags);
}
#else
/*
* Under LOCKDEP, the timer lock_class_key (set up in __init_timer) needs
* to be tied to the caller's context, so an inline (above) won't work. We
* do want to keep the inline for argument type checking, though.
/**
* timer_setup - prepare a timer for first use
* @timer: the timer in question
* @callback: the function to call when timer expires
* @flags: any TIMER_* flags
*
* Regular timer initialization should use either DEFINE_TIMER() above,
* or timer_setup(). For timers on the stack, timer_setup_on_stack() must
* be used and must be balanced with a call to destroy_timer_on_stack().
*/
# define timer_setup(timer, callback, flags) \
__setup_timer((timer), (TIMER_FUNC_TYPE)(callback), \
(flags))
# define timer_setup_on_stack(timer, callback, flags) \
__setup_timer_on_stack((timer), \
(TIMER_FUNC_TYPE)(callback), \
(flags))
#define timer_setup(timer, callback, flags) \
__init_timer((timer), (callback), (flags))
#define timer_setup_on_stack(timer, callback, flags) \
__init_timer_on_stack((timer), (callback), (flags))
#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
extern void destroy_timer_on_stack(struct timer_list *timer);
#else
static inline void destroy_timer_on_stack(struct timer_list *timer) { }
#endif
#define from_timer(var, callback_timer, timer_fieldname) \