[PATCH v2] arm64: perf: Drop the example the userspace counter section points at

[TAKANO Mitsuhiro <takano32@gmail.com>]

Documentation/arch/arm64/perf.rst points at
tools/perf/arch/arm64/tests/user-events.c, in the text and in the link
target, but the file does not exist: no file of that name is in
tools/perf/arch/arm64/tests/, and no commit in the history leading to this
base has added one.

The section already describes how to use the libperf helpers and points at
tools/lib/perf/tests/test-evsel.c as the example, so the sentence that
sends the reader elsewhere is redundant. Remove it and the link target
rather than pointing at another test, and move the instruction for running
the example into the How-to section, next to the reference it belongs to.

v1 pointed the reference at tools/perf/tests/mmap-basic.c. The review said
that file is a confusing example and that the section above already covers
the how-to, which is what this version does.

Signed-off-by: TAKANO Mitsuhiro <takano32@gmail.com>
---
 Documentation/arch/arm64/perf.rst | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/Documentation/arch/arm64/perf.rst b/Documentation/arch/arm64/perf.rst
index 997fd716b82f..5b9cc2aeb642 100644
--- a/Documentation/arch/arm64/perf.rst
+++ b/Documentation/arch/arm64/perf.rst
@@ -131,7 +131,12 @@ changed.
 
 The userspace access is supported in libperf using the perf_evsel__mmap()
 and perf_evsel__read() functions. See `tools/lib/perf/tests/test-evsel.c`_ for
-an example.
+an example, which can be built and run from the source tree:
+
+.. code-block:: sh
+
+  make -C tools/lib/perf make-tests
+  tools/lib/perf/tests-static
 
 About heterogeneous systems
 ---------------------------
@@ -140,14 +145,6 @@ only be enabled when the tasks are pinned to a homogeneous subset of cores and
 the corresponding PMU instance is opened by specifying the 'type' attribute.
 The use of generic event types is not supported in this case.
 
-Have a look at `tools/perf/arch/arm64/tests/user-events.c`_ for an example. It
-can be run using the perf tool to check that the access to the registers works
-correctly from userspace:
-
-.. code-block:: sh
-
-  perf test -v user
-
 About chained events and counter sizes
 --------------------------------------
 The user can request either a 32-bit (config1:0 == 0) or 64-bit (config1:0 == 1)
@@ -160,8 +157,6 @@ userspace must treat the upper 32-bits read from the counter as UNKNOWN. The
 and should be used to mask the upper bits as needed.
 
 .. Links
-.. _tools/perf/arch/arm64/tests/user-events.c:
-   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/arch/arm64/tests/user-events.c
 .. _tools/lib/perf/tests/test-evsel.c:
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/lib/perf/tests/test-evsel.c
 

base-commit: 7475ea8b58616b33c04afb976cf0fbaad9dd63fb
-- 
2.53.0