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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2022-10-09 22:30:23 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2022-10-09 22:30:23 -0700
commit5f8f8574c7f5585b09a9623f0f13462e4eb67b4d (patch)
tree8f1d5e88bf9604a9e39fbcce0e37b3d8cee451bb /Documentation/RCU
parente62563db857f81d75c5726a35bc0180bed6d1540 (diff)
parentfe5b6aaef72a0f7daa06e7960e0bee45c2984e41 (diff)
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Merge branch 'next' into for-linus
Prepare input updates for 6.1 merge window.
Diffstat (limited to 'Documentation/RCU')
-rw-r--r--Documentation/RCU/Design/Requirements/Requirements.rst10
-rw-r--r--Documentation/RCU/stallwarn.rst6
2 files changed, 8 insertions, 8 deletions
diff --git a/Documentation/RCU/Design/Requirements/Requirements.rst b/Documentation/RCU/Design/Requirements/Requirements.rst
index 04ed8bf27a0e..a0f8164c8513 100644
--- a/Documentation/RCU/Design/Requirements/Requirements.rst
+++ b/Documentation/RCU/Design/Requirements/Requirements.rst
@@ -1844,10 +1844,10 @@ that meets this requirement.
Furthermore, NMI handlers can be interrupted by what appear to RCU to be
normal interrupts. One way that this can happen is for code that
-directly invokes rcu_irq_enter() and rcu_irq_exit() to be called
+directly invokes ct_irq_enter() and ct_irq_exit() to be called
from an NMI handler. This astonishing fact of life prompted the current
-code structure, which has rcu_irq_enter() invoking
-rcu_nmi_enter() and rcu_irq_exit() invoking rcu_nmi_exit().
+code structure, which has ct_irq_enter() invoking
+ct_nmi_enter() and ct_irq_exit() invoking ct_nmi_exit().
And yes, I also learned of this requirement the hard way.
Loadable Modules
@@ -2195,7 +2195,7 @@ scheduling-clock interrupt be enabled when RCU needs it to be:
sections, and RCU believes this CPU to be idle, no problem. This
sort of thing is used by some architectures for light-weight
exception handlers, which can then avoid the overhead of
- rcu_irq_enter() and rcu_irq_exit() at exception entry and
+ ct_irq_enter() and ct_irq_exit() at exception entry and
exit, respectively. Some go further and avoid the entireties of
irq_enter() and irq_exit().
Just make very sure you are running some of your tests with
@@ -2226,7 +2226,7 @@ scheduling-clock interrupt be enabled when RCU needs it to be:
+-----------------------------------------------------------------------+
| **Answer**: |
+-----------------------------------------------------------------------+
-| One approach is to do ``rcu_irq_exit();rcu_irq_enter();`` every so |
+| One approach is to do ``ct_irq_exit();ct_irq_enter();`` every so |
| often. But given that long-running interrupt handlers can cause other |
| problems, not least for response time, shouldn't you work to keep |
| your interrupt handler's runtime within reasonable bounds? |
diff --git a/Documentation/RCU/stallwarn.rst b/Documentation/RCU/stallwarn.rst
index 794837eb519b..e38c587067fc 100644
--- a/Documentation/RCU/stallwarn.rst
+++ b/Documentation/RCU/stallwarn.rst
@@ -97,12 +97,12 @@ warnings:
which will include additional debugging information.
- A low-level kernel issue that either fails to invoke one of the
- variants of rcu_user_enter(), rcu_user_exit(), rcu_idle_enter(),
- rcu_idle_exit(), rcu_irq_enter(), or rcu_irq_exit() on the one
+ variants of rcu_eqs_enter(true), rcu_eqs_exit(true), ct_idle_enter(),
+ ct_idle_exit(), ct_irq_enter(), or ct_irq_exit() on the one
hand, or that invokes one of them too many times on the other.
Historically, the most frequent issue has been an omission
of either irq_enter() or irq_exit(), which in turn invoke
- rcu_irq_enter() or rcu_irq_exit(), respectively. Building your
+ ct_irq_enter() or ct_irq_exit(), respectively. Building your
kernel with CONFIG_RCU_EQS_DEBUG=y can help track down these types
of issues, which sometimes arise in architecture-specific code.