diff options
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 7da33619d5d0..78eb92ae4d94 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -34,6 +34,7 @@ #include <linux/percpu.h> #include <linux/topology.h> #include <linux/seccomp.h> +#include <linux/rcupdate.h> #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */ @@ -350,8 +351,16 @@ struct sighand_struct { atomic_t count; struct k_sigaction action[_NSIG]; spinlock_t siglock; + struct rcu_head rcu; }; +extern void sighand_free_cb(struct rcu_head *rhp); + +static inline void sighand_free(struct sighand_struct *sp) +{ + call_rcu(&sp->rcu, sighand_free_cb); +} + /* * NOTE! "signal_struct" does not have it's own * locking, because a shared signal_struct always @@ -762,6 +771,7 @@ struct task_struct { unsigned keep_capabilities:1; struct user_struct *user; #ifdef CONFIG_KEYS + struct key *request_key_auth; /* assumed request_key authority */ struct key *thread_keyring; /* keyring private to this thread */ unsigned char jit_keyring; /* default keyring to attach requested keys to */ #endif @@ -844,6 +854,7 @@ struct task_struct { int cpuset_mems_generation; #endif atomic_t fs_excl; /* holding fs exclusive resources */ + struct rcu_head rcu; }; static inline pid_t process_group(struct task_struct *tsk) @@ -867,8 +878,14 @@ static inline int pid_alive(struct task_struct *p) extern void free_task(struct task_struct *tsk); extern void __put_task_struct(struct task_struct *tsk); #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) -#define put_task_struct(tsk) \ -do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0) + +extern void __put_task_struct_cb(struct rcu_head *rhp); + +static inline void put_task_struct(struct task_struct *t) +{ + if (atomic_dec_and_test(&t->usage)) + call_rcu(&t->rcu, __put_task_struct_cb); +} /* * Per process flags @@ -895,6 +912,7 @@ do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0) #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */ #define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */ #define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */ +#define PF_SWAPWRITE 0x01000000 /* Allowed to write to swap */ /* * Only the _current_ task can read/write to tsk->flags, but other |