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Subject[PATCH 5/5] typesafe: TIMER_INITIALIZER and setup_timer
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This patch lets timer callback functions have their natural type
(ie. exactly match the data pointer type); it allows the old "unsigned
long data" type as well.

Downside: if you use the old "unsigned long" callback type, you won't
get a warning if your data is not an unsigned long, due to the cast.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
include/linux/timer.h | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
diff -r c53eb02af893 include/linux/timer.h
--- a/include/linux/timer.h Thu Jan 31 17:27:22 2008 +1100
+++ b/include/linux/timer.h Thu Jan 31 17:27:39 2008 +1100
@@ -24,11 +24,13 @@ struct timer_list {

extern struct tvec_base boot_tvec_bases;

-#define TIMER_INITIALIZER(_function, _expires, _data) { \
- .function = (_function), \
- .expires = (_expires), \
- .data = (_data), \
- .base = &boot_tvec_bases, \
+
+#define TIMER_INITIALIZER(_function, _expires, _data) { \
+ .function = cast_if_type(_function, void (*)(typeof(_data)), \
+ void (*)(unsigned long)), \
+ .expires = (_expires), \
+ .data = (unsigned long)(_data), \
+ .base = &boot_tvec_bases, \
}

#define DEFINE_TIMER(_name, _function, _expires, _data) \
@@ -38,9 +40,15 @@ void fastcall init_timer(struct timer_li
void fastcall init_timer(struct timer_list * timer);
void fastcall init_timer_deferrable(struct timer_list *timer);

-static inline void setup_timer(struct timer_list * timer,
- void (*function)(unsigned long),
- unsigned long data)
+#define setup_timer(timer, function, data) \
+ __setup_timer((timer), \
+ cast_if_type(function, void (*)(typeof(data)), \
+ void (*)(unsigned long)), \
+ (unsigned long)(data))
+
+static inline void __setup_timer(struct timer_list * timer,
+ void (*function)(unsigned long),
+ unsigned long data)
{
timer->function = function;
timer->data = data;

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