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authorMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-04-21 19:04:04 +0200
committerPaul E. McKenney <paulmck@kernel.org>2020-06-29 11:58:11 -0700
commit058cc23bcad08aca62987cc795fe406ac39146d0 (patch)
tree8b7bff8a4df54bf83f33db916c11179e8541c438 /Documentation/RCU
parenta3b0a79f8903f955250505f99d1e37b6c7d7b060 (diff)
downloadlinux-058cc23bcad08aca62987cc795fe406ac39146d0.tar.bz2
docs: RCU: Convert lockdep.txt to ReST
- Add a SPDX header; - Adjust document title; - Mark literal blocks as such; - Add it to RCU/index.rst. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'Documentation/RCU')
-rw-r--r--Documentation/RCU/index.rst1
-rw-r--r--Documentation/RCU/lockdep.rst (renamed from Documentation/RCU/lockdep.txt)12
2 files changed, 9 insertions, 4 deletions
diff --git a/Documentation/RCU/index.rst b/Documentation/RCU/index.rst
index 430a37132b2c..fa7a2a8949b7 100644
--- a/Documentation/RCU/index.rst
+++ b/Documentation/RCU/index.rst
@@ -11,6 +11,7 @@ RCU concepts
arrayRCU
checklist
+ lockdep
lockdep-splat
rcubarrier
rcu_dereference
diff --git a/Documentation/RCU/lockdep.txt b/Documentation/RCU/lockdep.rst
index 89db949eeca0..f1fc8ae3846a 100644
--- a/Documentation/RCU/lockdep.txt
+++ b/Documentation/RCU/lockdep.rst
@@ -1,4 +1,8 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+========================
RCU and lockdep checking
+========================
All flavors of RCU have lockdep checking available, so that lockdep is
aware of when each task enters and leaves any flavor of RCU read-side
@@ -8,7 +12,7 @@ tracking to include RCU state, which can sometimes help when debugging
deadlocks and the like.
In addition, RCU provides the following primitives that check lockdep's
-state:
+state::
rcu_read_lock_held() for normal RCU.
rcu_read_lock_bh_held() for RCU-bh.
@@ -63,7 +67,7 @@ checking of rcu_dereference() primitives:
The rcu_dereference_check() check expression can be any boolean
expression, but would normally include a lockdep expression. However,
any boolean expression can be used. For a moderately ornate example,
-consider the following:
+consider the following::
file = rcu_dereference_check(fdt->fd[fd],
lockdep_is_held(&files->file_lock) ||
@@ -82,7 +86,7 @@ RCU read-side critical sections, in case (2) the ->file_lock prevents
any change from taking place, and finally, in case (3) the current task
is the only task accessing the file_struct, again preventing any change
from taking place. If the above statement was invoked only from updater
-code, it could instead be written as follows:
+code, it could instead be written as follows::
file = rcu_dereference_protected(fdt->fd[fd],
lockdep_is_held(&files->file_lock) ||
@@ -105,7 +109,7 @@ false and they are called from outside any RCU read-side critical section.
For example, the workqueue for_each_pwq() macro is intended to be used
either within an RCU read-side critical section or with wq->mutex held.
-It is thus implemented as follows:
+It is thus implemented as follows::
#define for_each_pwq(pwq, wq)
list_for_each_entry_rcu((pwq), &(wq)->pwqs, pwqs_node,