Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:include\linux\percpu-rwsem.h Create Date:2022-07-28 05:42:29
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:percpu_down_read

Proto:static inline void percpu_down_read(struct percpu_rw_semaphore *sem)

Type:void

Parameter:

TypeParameterName
struct percpu_rw_semaphore *sem
38  might_sleep()
40  rwsem_acquire_read( & dep_map, 0, 0, _RET_IP_)
42  Even if we don't have any preemption, we need preempt disable/enable* to be barriers, so that we don't have things like get_user/put_user* that can cause faults and scheduling migrate into our preempt-protected* region.()
51  __this_cpu_inc( * read_count)
52  If Value for the false possibility is greater at compile time(!_sync_is_idle() - Are readers permitted to use their fastpaths?*@rsp: Pointer to rcu_sync structure to use for synchronization* Returns true if readers are permitted to use their fastpaths. Must be) Then __percpu_down_read(sem, false)
58  preempt_enable()
Caller
NameDescribe
torture_percpu_rwsem_down_read
cpuset_read_lock
uprobe_start_dup_mmap
get_online_mems
__sb_start_writeThis is an internal function, please use sb_start_{write,pagefault,intwrite}* instead.
flock_lock_inodeTry to create a FLOCK lock on filp
posix_lock_inode
__break_leaserevoke all outstanding leases on file
fcntl_getleaseEnquire what lease is currently active
generic_add_lease
generic_delete_lease
locks_remove_leaseThe i_flctx must be valid when calling into here