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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2022-10-09 22:30:23 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2022-10-09 22:30:23 -0700 |
| commit | 5f8f8574c7f5585b09a9623f0f13462e4eb67b4d (patch) | |
| tree | 8f1d5e88bf9604a9e39fbcce0e37b3d8cee451bb /Documentation/RCU | |
| parent | e62563db857f81d75c5726a35bc0180bed6d1540 (diff) | |
| parent | fe5b6aaef72a0f7daa06e7960e0bee45c2984e41 (diff) | |
| download | linux-5f8f8574c7f5585b09a9623f0f13462e4eb67b4d.tar.gz linux-5f8f8574c7f5585b09a9623f0f13462e4eb67b4d.tar.bz2 linux-5f8f8574c7f5585b09a9623f0f13462e4eb67b4d.zip | |
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.rst | 10 | ||||
| -rw-r--r-- | Documentation/RCU/stallwarn.rst | 6 |
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. |
