ata: libata-scsi: fix ata_dsm_trim_pages() kernel-docgrafted

make htmldocs fails with:

  Documentation/driver-api/libata:604: ./drivers/ata/libata-scsi.c:2301:
  ERROR: Unexpected indentation. [docutils]

The Return: section of ata_dsm_trim_pages() ends its first sentence with
a colon and continues with an indented bullet list. reStructuredText
requires a blank line before an indented block, so docutils chokes on
the list.

Simply adding the missing blank line does not work either: Return: is a
kernel-doc "special section", which is terminated by the first blank
line, so the bullet list would end up in the Description section,
detached from the sentence introducing it.

Spell the two bounds out as prose instead, so that the Return: section
stays self-contained. Documentation-only change.

Fixes: e64e6b5dc867 ("ata: libata-scsi: scale DSM TRIM payload by MAX PAGES PER DSM COMMAND")
Reported-by: Thomas Huth <thuth@redhat.com>
Closes: https://lore.kernel.org/linux-ide/b0a0b8e8-cc4f-4c7b-8bc5-fee0712d405a@redhat.com/
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Link: https://lore.kernel.org/r/20260916130031.29990-2-cassel@kernel.org
Signed-off-by: Niklas Cassel <cassel@kernel.org>

1 files changed, 136 insertions, 0 deletions

diff --git a/Documentation/tools/rtla/rtla-timerlat-top.rst b/Documentation/tools/rtla/rtla-timerlat-top.rst
new file mode 100644
index 000000000..05959f1a4
--- /dev/null
+++ b/Documentation/tools/rtla/rtla-timerlat-top.rst
@@ -0,0 +1,136 @@
+.. |tool| replace:: timerlat top
+
+====================
+rtla-timerlat-top
+====================
+-------------------------------------------
+Measures the operating system timer latency
+-------------------------------------------
+
+:Manual section: 1
+
+SYNOPSIS
+========
+**rtla timerlat top** [*OPTIONS*] ...
+
+DESCRIPTION
+===========
+
+.. include:: common_timerlat_description.txt
+
+The **rtla timerlat top** displays a summary of the periodic output
+from the *timerlat* tracer. It also provides information for each
+operating system noise via the **osnoise:** tracepoints that can be
+seen with the option **-T**.
+
+OPTIONS
+=======
+
+.. include:: common_timerlat_options.txt
+
+.. include:: common_top_options.txt
+
+.. include:: common_options.txt
+
+.. include:: common_timerlat_aa.txt
+
+**--aa-only** *us*
+
+        Set stop tracing conditions and run without collecting and displaying statistics.
+        Print the auto-analysis if the system hits the stop tracing condition. This option
+        is useful to reduce rtla timerlat CPU, enabling the debug without the overhead of
+        collecting the statistics.
+
+EXAMPLE
+=======
+
+In the example below, the timerlat tracer is dispatched in cpus *1-23* in the
+automatic trace mode, instructing the tracer to stop if a *40 us* latency or
+higher is found::
+
+  # timerlat -a 40 -c 1-23 -q
+                                     Timer Latency
+    0 00:00:12   |          IRQ Timer Latency (us)        |         Thread Timer Latency (us)
+  CPU COUNT      |      cur       min       avg       max |      cur       min       avg       max
+    1 #12322     |        0         0         1        15 |       10         3         9        31
+    2 #12322     |        3         0         1        12 |       10         3         9        23
+    3 #12322     |        1         0         1        21 |        8         2         8        34
+    4 #12322     |        1         0         1        17 |       10         2        11        33
+    5 #12322     |        0         0         1        12 |        8         3         8        25
+    6 #12322     |        1         0         1        14 |       16         3        11        35
+    7 #12322     |        0         0         1        14 |        9         2         8        29
+    8 #12322     |        1         0         1        22 |        9         3         9        34
+    9 #12322     |        0         0         1        14 |        8         2         8        24
+   10 #12322     |        1         0         0        12 |        9         3         8        24
+   11 #12322     |        0         0         0        15 |        6         2         7        29
+   12 #12321     |        1         0         0        13 |        5         3         8        23
+   13 #12319     |        0         0         1        14 |        9         3         9        26
+   14 #12321     |        1         0         0        13 |        6         2         8        24
+   15 #12321     |        1         0         1        15 |       12         3        11        27
+   16 #12318     |        0         0         1        13 |        7         3        10        24
+   17 #12319     |        0         0         1        13 |       11         3         9        25
+   18 #12318     |        0         0         0        12 |        8         2         8        20
+   19 #12319     |        0         0         1        18 |       10         2         9        28
+   20 #12317     |        0         0         0        20 |        9         3         8        34
+   21 #12318     |        0         0         0        13 |        8         3         8        28
+   22 #12319     |        0         0         1        11 |        8         3        10        22
+   23 #12320     |       28         0         1        28 |       41         3        11        41
+  rtla timerlat hit stop tracing
+  ## CPU 23 hit stop tracing, analyzing it ##
+  IRQ handler delay:                                        27.49 us (65.52 %)
+  IRQ latency:                                              28.13 us
+  Timerlat IRQ duration:                                     9.59 us (22.85 %)
+  Blocking thread:                                           3.79 us (9.03 %)
+                         objtool:49256                       3.79 us
+    Blocking thread stacktrace
+                -> timerlat_irq
+                -> __hrtimer_run_queues
+                -> hrtimer_interrupt
+                -> __sysvec_apic_timer_interrupt
+                -> sysvec_apic_timer_interrupt
+                -> asm_sysvec_apic_timer_interrupt
+                -> _raw_spin_unlock_irqrestore
+                -> cgroup_rstat_flush_locked
+                -> cgroup_rstat_flush_irqsafe
+                -> mem_cgroup_flush_stats
+                -> mem_cgroup_wb_stats
+                -> balance_dirty_pages
+                -> balance_dirty_pages_ratelimited_flags
+                -> btrfs_buffered_write
+                -> btrfs_do_write_iter
+                -> vfs_write
+                -> __x64_sys_pwrite64
+                -> do_syscall_64
+                -> entry_SYSCALL_64_after_hwframe
+  ------------------------------------------------------------------------
+    Thread latency:                                          41.96 us (100%)
+
+  The system has exit from idle latency!
+    Max timerlat IRQ latency from idle: 17.48 us in cpu 4
+  Saving trace to timerlat_trace.txt
+
+In this case, the major factor was the delay suffered by the *IRQ handler*
+that handles **timerlat** wakeup: *65.52%*. This can be caused by the
+current thread masking interrupts, which can be seen in the blocking
+thread stacktrace: the current thread (*objtool:49256*) disabled interrupts
+via *raw spin lock* operations inside mem cgroup, while doing write
+syscall in a btrfs file system.
+
+The raw trace is saved in the **timerlat_trace.txt** file for further analysis.
+
+Note that **rtla timerlat** was dispatched without changing *timerlat* tracer
+threads' priority. That is generally not needed because these threads have
+priority *FIFO:95* by default, which is a common priority used by real-time
+kernel developers to analyze scheduling delays.
+
+SEE ALSO
+--------
+**rtla-timerlat**\(1), **rtla-timerlat-hist**\(1)
+
+`Timerlat tracer <https://docs.kernel.org/trace/timerlat-tracer.html>`__
+
+AUTHOR
+------
+Written by Daniel Bristot de Oliveira <bristot@kernel.org>
+
+.. include:: common_appendix.txt