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srcu,notifier: Remove #ifdefs in favor of SRCU Tiny srcu_usage

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This commit removes two #ifdef directives from include/linux/notifier.h
by causing SRCU Tiny to provide a dummy srcu_usage structure and a dummy
__SRCU_USAGE_INIT() macro.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
Cc: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Cc: Sachin Sant <sachinp@linux.ibm.com>
Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2023-06-16 16:07:24 -07:00
parent c924bf5a43
commit ed2b9e1b6d
2 changed files with 4 additions and 11 deletions
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11
include/linux/notifier.h
View File

@ -73,9 +73,7 @@ struct raw_notifier_head {
struct srcu_notifier_head {
struct mutex mutex;
#ifdef CONFIG_TREE_SRCU
struct srcu_usage srcuu;
#endif
struct srcu_struct srcu;
struct notifier_block __rcu *head;
};
@ -106,7 +104,6 @@ extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
#define RAW_NOTIFIER_INIT(name) { \
.head = NULL }
#ifdef CONFIG_TREE_SRCU
#define SRCU_NOTIFIER_INIT(name, pcpu) \
{ \
.mutex = __MUTEX_INITIALIZER(name.mutex), \
@ -114,14 +111,6 @@ extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
.srcuu = __SRCU_USAGE_INIT(name.srcuu), \
.srcu = __SRCU_STRUCT_INIT(name.srcu, name.srcuu, pcpu), \
}
#else
#define SRCU_NOTIFIER_INIT(name, pcpu) \
{ \
.mutex = __MUTEX_INITIALIZER(name.mutex), \
.head = NULL, \
.srcu = __SRCU_STRUCT_INIT(name.srcu, name.srcuu, pcpu), \
}
#endif
#define ATOMIC_NOTIFIER_HEAD(name) \
struct atomic_notifier_head name = \

4
include/linux/srcutiny.h
View File

@ -48,6 +48,10 @@ void srcu_drive_gp(struct work_struct *wp);
#define DEFINE_STATIC_SRCU(name) \
static struct srcu_struct name = __SRCU_STRUCT_INIT(name, name, name)
// Dummy structure for srcu_notifier_head.
struct srcu_usage { };
#define __SRCU_USAGE_INIT(name) { }
void synchronize_srcu(struct srcu_struct *ssp);
/*