OpenCloudOS-Kernel/include
Paul E. McKenney 0b1182bde3 rcu: Add srcu_down_read() and srcu_up_read()
A pair of matching srcu_read_lock() and srcu_read_unlock() invocations
must take place within the same context, for example, within the same
task.  Otherwise, lockdep complains, as is the right thing to do for
most use cases.

However, there are use cases involving asynchronous I/O where the
SRCU reader needs to begin on one task and end on another.  This commit
therefore supplies the semaphore-like srcu_down_read() and srcu_up_read(),
which act like srcu_read_lock() and srcu_read_unlock(), but permitting
srcu_up_read() to be invoked in a different context than was the matching
srcu_down_read().

Neither srcu_down_read() nor srcu_up_read() may be invoked from an
NMI handler.

Reported-by: Jan Kara <jack@suse.cz>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Tested-by: Amir Goldstein <amir73il@gmail.com>
2023-01-03 17:49:22 -08:00
..
acpi More ACPI updates for 6.2-rc1 2022-12-15 10:21:10 -08:00
asm-generic asm-generic bits for 6.2 2022-12-20 08:32:11 -06:00
clocksource Updates for timers, timekeeping and drivers: 2022-12-12 12:52:02 -08:00
crypto crypto: acomp - define max size for destination 2022-12-09 18:45:00 +08:00
drm Some deferred-io and damage worker reworks revert and make a fb function 2022-12-09 11:53:52 +10:00
dt-bindings remoteproc updates for v6.2 2022-12-21 09:37:14 -08:00
keys
kunit kunit: add macro to allow conditionally exposing static symbols to tests 2022-12-12 14:13:48 -07:00
kvm Merge branch kvm-arm64/pmu-unchained into kvmarm-master/next 2022-12-05 14:38:44 +00:00
linux rcu: Add srcu_down_read() and srcu_up_read() 2023-01-03 17:49:22 -08:00
math-emu
media Merge tag 'br-v6.2i' of git://linuxtv.org/hverkuil/media_tree into media_stage 2022-12-07 17:58:47 +01:00
memory
misc cxl: fix typo in comment 2022-11-24 23:12:19 +11:00
net 9p-for-6.2-rc1 2022-12-23 11:39:18 -08:00
pcmcia
ras
rdma RDMA: Extend RDMA kernel verbs ABI to support flush 2022-12-09 19:36:01 -04:00
rv
scsi SCSI misc on 20221222 2022-12-22 11:22:31 -08:00
soc Networking changes for 6.2. 2022-12-13 15:47:48 -08:00
sound ALSA: hda/hdmi: fix stream-id config keep-alive for rt suspend 2022-12-09 12:06:15 +01:00
target scsi: target: core: Send max transfer length in blocks 2022-11-24 02:16:19 +00:00
trace pwm: Changes for v6.2-rc1 2022-12-21 09:41:28 -08:00
uapi SCSI misc on 20221222 2022-12-22 11:22:31 -08:00
ufs
vdso
video fbdev: omapfb: connector-analog-tv: remove support for platform data 2022-12-14 20:01:49 +01:00
xen xen: fix xen.h build for CONFIG_XEN_PVH=y 2022-12-05 12:59:49 +01:00