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ANDROID: rwsem: Export rwsem_waiter struct for loadable modules

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The rwsem_waiter struct is needed in vendor hook alter_rwsem_list_add.
It has parameter sem which is a struct rw_semaphore (already export in
rwsem.h), inside the structure there is a wait_list to link
"struct rwsem_waiter" items. The task information in each item of the
wait_list is needed to be referenced in vendor loadable modules.

Bug: 174902706
Change-Id: Ic7d21ffdd795eaa203989751d26f8b1f32134d8b
Signed-off-by: Huang Yiwei <hyiwei@codeaurora.org>
Signed-off-by: Vamsi Krishna Lanka <quic_vamslank@quicinc.com>
This commit is contained in:
Huang Yiwei
2020-12-25 18:07:37 +08:00
committed by Todd Kjos
parent 00da226f8b
commit 82b3ce0bcc
2 changed files with 16 additions and 14 deletions
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16
include/linux/rwsem.h
View File

@@ -66,6 +66,22 @@ struct rw_semaphore {
#endif #endif
}; };
enum rwsem_waiter_type {
RWSEM_WAITING_FOR_WRITE,
RWSEM_WAITING_FOR_READ
};
struct rwsem_waiter {
struct list_head list;
struct task_struct *task;
enum rwsem_waiter_type type;
unsigned long timeout;
unsigned long last_rowner;
/* Writer only, not initialized in reader */
bool handoff_set;
};
/* In all implementations count != 0 means locked */ /* In all implementations count != 0 means locked */
static inline int rwsem_is_locked(struct rw_semaphore *sem) static inline int rwsem_is_locked(struct rw_semaphore *sem)
{ {

14
kernel/locking/rwsem.c
View File

@@ -325,20 +325,6 @@ void __init_rwsem(struct rw_semaphore *sem, const char *name,
} }
EXPORT_SYMBOL(__init_rwsem); EXPORT_SYMBOL(__init_rwsem);
enum rwsem_waiter_type {
RWSEM_WAITING_FOR_WRITE,
RWSEM_WAITING_FOR_READ
};
struct rwsem_waiter {
struct list_head list;
struct task_struct *task;
enum rwsem_waiter_type type;
unsigned long timeout;
/* Writer only, not initialized in reader */
bool handoff_set;
};
#define rwsem_first_waiter(sem) \ #define rwsem_first_waiter(sem) \
list_first_entry(&sem->wait_list, struct rwsem_waiter, list) list_first_entry(&sem->wait_list, struct rwsem_waiter, list)