[LTP] [PATCH v6 0/5] ftrace: Convert shell tests to C

[Praveen K Pandey]

This patch series converts the ftrace shell-based tests to C using
the new LTP test API. This addresses issue #1282 and provides better
error handling, maintainability, and integration with LTP's modern
test infrastructure.

Changes in v6:
- ftrace_lib.c:
  * Removed C++ style comment
  * Removed unused variable 'ret' in ftrace_set_tracer()
  * Added NULL check for strdup() in ftrace_restore_settings()
  * Added Suggested-by tag for Cyril Hrubis who provided the
    refactoring suggestions implemented in v5
- ftrace_regression01.c:
  * Fixed commit message to accurately describe the test
    (tests for kernel panic with userstacktrace, not "all tracers")
  * Removed incorrect .min_kver reference from commit message
- ftrace_regression02.c:
  * Fixed commit message to correctly state .min_kver = "3.2"
- ftrace_stress_test.c:
  * Fixed pthread_join() being called twice (undefined behavior)
    by resetting thread_count to 0 in stop_stress_tests()
  * Reset stop_testing and thread_count at start of run_test()
    to support multiple iterations (-i N)
  * Simplified cleanup() to avoid redundant stop_testing assignment
- Makefile changes:
  * Moved to patch 1 to maintain bisectability - each commit
    in the series now builds independently

Changes in v5:
- ftrace_lib.c: Major refactoring based on review feedback
  * Removed static variable initialization to 0/NULL (C standard)
  * Removed obvious comments for cleaner code
  * Replaced manual debugfs mount check with tst_is_mounted()
  * Used SAFE_ASPRINTF() for all path construction
  * Used SAFE_FILE_PRINTF() in ftrace_set_tracer()
  * Simplified ftrace_get_available_tracers() to read line by line
  * Added proper error checking for strdup() calls
- ftrace_lib.h: Cleaned up API
  * Fixed kernel-doc comment format (use - instead of ())
  * Removed low-level implementation details from header
- ftrace_regression01.c/ftrace_regression02.c:
  * Removed deprecated [Description] header line
- ftrace_stress_test.c:
  * Fixed use-after-free: join threads before ftrace_cleanup()

Changes in v4:
- Fixed trailing whitespace issues
- Corrected commit message format and content
- Replaced tst_kvercmp() with .min_kver = "2.6.29"
- Removed LTP_TIMEOUT_MUL parsing (handled by framework)
- Updated documentation to reflect root requirement

Changes in v3:
- Fixed tst_tmpdir_path() usage in ftrace_lib.c
- Removed CVE tag from test documentation
- Fixed memory leaks in ftrace_get_available_tracers()
- Changed Algorithm sections to bullet points
- Added root requirement to test documentation
- Fixed Makefile to include ftrace_lib.o in LDLIBS
- Created .gitignore for compiled binaries
- Removed deprecated tst_reinit.h include
- Deleted orphaned shell test files

Changes in v2:
- Moved TST_NO_DEFAULT_MAIN before includes
- Fixed include order (tst_test.h before tst_safe_*.h)
- Removed tst_reinit() calls (not needed with new API)
- Fixed test structure initialization
- Improved error messages

The conversion provides:
- Better error handling using LTP's SAFE_* macros
- Proper resource cleanup and state restoration
- Modern LTP test API usage
- Improved code maintainability
- Type safety and compile-time checks
- Bisectable commit history

Testing:
- Compiled successfully on x86_64 and ppc64le
- All tests pass on systems with ftrace support
- Proper cleanup verified (settings restored after test)
- Multiple iterations tested (-i N flag)

Praveen K Pandey (5):
  ftrace: Add common library for C implementation
  ftrace: Convert ftrace_regression01.sh to C
  ftrace: Convert ftrace_regression02.sh to C
  ftrace: Convert ftrace_stress_test.sh to C
  ftrace: Remove obsolete shell test files

 runtest/tracing                               |   6 +-
 .../kernel/tracing/ftrace_test/.gitignore     |   4 +
 testcases/kernel/tracing/ftrace_test/Makefile |  19 +-
 .../kernel/tracing/ftrace_test/ftrace_lib.c   | 374 ++++++++++++++++++
 .../kernel/tracing/ftrace_test/ftrace_lib.h   | 136 +++++++
 .../kernel/tracing/ftrace_test/ftrace_lib.sh  | 180 ---------
 .../tracing/ftrace_test/ftrace_regression01.c | 126 ++++++
 .../ftrace_test/ftrace_regression01.sh        |  83 ----
 .../tracing/ftrace_test/ftrace_regression02.c | 101 +++++
 .../ftrace_test/ftrace_regression02.sh        |  63 ---
 .../ftrace_stress/ftrace_buffer_size_kb.sh    |  45 ---
 .../ftrace_stress/ftrace_current_tracer.sh    |  32 --
 .../ftrace_stress/ftrace_ftrace_enabled.sh    |  38 --
 .../ftrace_function_profile_enabled.sh        |  38 --
 .../ftrace_stress/ftrace_set_event.sh         |  46 ---
 .../ftrace_stress/ftrace_set_ftrace_filter.sh | 119 ------
 .../ftrace_stress/ftrace_set_ftrace_pid.sh    |  37 --
 .../ftrace_stress/ftrace_stack_max_size.sh    |  27 --
 .../ftrace_stress/ftrace_stack_trace.sh       |  35 --
 .../ftrace_test/ftrace_stress/ftrace_trace.sh |  25 --
 .../ftrace_stress/ftrace_trace_clock.sh       |  27 --
 .../ftrace_stress/ftrace_trace_options.sh     |  58 ---
 .../ftrace_stress/ftrace_trace_pipe.sh        |  45 ---
 .../ftrace_stress/ftrace_trace_stat.sh        |  38 --
 .../ftrace_stress/ftrace_tracing_cpumask.sh   |  91 -----
 .../ftrace_stress/ftrace_tracing_enabled.sh   |  38 --
 .../ftrace_tracing_max_latency.sh             |  27 --
 .../ftrace_stress/ftrace_tracing_on.sh        |  38 --
 .../tracing/ftrace_test/ftrace_stress_test.c  | 328 +++++++++++++++
 ./tracing/ftrace_test/ftrace_stress_test.sh | 121 ------
 30 files changed, 1086 insertions(+), 1256 deletions(-)
 create mode 100644 testcases/kernel/tracing/ftrace_test/.gitignore
 create mode 100644 testcases/kernel/tracing/ftrace_test/ftrace_lib.c
 create mode 100644 testcases/kernel/tracing/ftrace_test/ftrace_lib.h
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_lib.sh
 create mode 100644 testcases/kernel/tracing/ftrace_test/ftrace_regression01.c
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_regression01.sh
 create mode 100644 testcases/kernel/tracing/ftrace_test/ftrace_regression02.c
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_regression02.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_buffer_size_kb.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_current_tracer.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_ftrace_enabled.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_function_profile_enabled.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_set_event.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_set_ftrace_filter.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_set_ftrace_pid.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_stack_max_size.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_stack_trace.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_trace.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_trace_clock.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_trace_options.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_trace_pipe.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_trace_stat.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_tracing_cpumask.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_tracing_enabled.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_tracing_max_latency.sh
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress/ftrace_tracing_on.sh
 create mode 100644 testcases/kernel/tracing/ftrace_test/ftrace_stress_test.c
 delete mode 100755 testcases/kernel/tracing/ftrace_test/ftrace_stress_test.sh

-- 
2.50.1