kernel/linux.git/tools/perf/arch, branch v7.2-rc1

perf riscv: fix register name strings

2026-06-10T19:54:41+00:00

On risc-v, pref probe generates an invalid syntax for a named register in a kprobe. $ perf probe --debug verbose --add "n_tty_write tty" ... Writing event: p:probe/n_tty_write _text+8922528 tty=%"%a0":x64 Failed to write event: Invalid argument The problem is the combination of #define REG_DWARFNUM_NAME(reg, idx) [idx] = "%" #reg and entries such as REG_DWARFNUM_NAME("%a0", 10) where #reg will escape the quotes of the first macro parameter. Update the macro definition to produce the correct syntax for a named register in a kprobe, i.e. the unquoted register name with only one leading %. Fixes: a90c4519186dfc08 ("perf riscv: Remove dwarf-regs.c and add dwarf-regs-table.h") Reviewed-by: Ian Rogers Signed-off-by: Martin Kaiser Cc: Ian Rogers Cc: Namhyung Kim Signed-off-by: Arnaldo Carvalho de Melo

perf dwarf: Avoid redefinition warnings for REG_DWARFNUM_NAME

2026-06-10T19:53:35+00:00

dwarf-regs.c includes an arch-specific dwarf-regs-table.h for several architectures. This pulls in different definitions of REG_DWARFNUM_NAME and causes compiler warnings for W=1 builds. In file included from util/dwarf-regs.c:23: .../dwarf-regs-table.h:5: error: "REG_DWARFNUM_NAME" redefined [-Werror] #define REG_DWARFNUM_NAME(reg, idx) [idx] = reg Undefine REG_DWARFNUM_NAME before each new definition. Suggested-by: Arnaldo Carvalho de Melo Signed-off-by: Martin Kaiser Cc: Ian Rogers Cc: Namhyung Kim Signed-off-by: Arnaldo Carvalho de Melo

perf arch common: Use perf_env e_machine rather than arch

2026-06-03T19:48:23+00:00

Use the e_machine rather than arch string matching. Signed-off-by: Ian Rogers Acked-by: Namhyung Kim Cc: Alexander Gordeev Cc: Heiko Carstens Cc: Honglei Wang Cc: Jan Polensky Cc: Sumanth Korikkar Cc: Thomas Richter Cc: Vasily Gorbik Signed-off-by: Arnaldo Carvalho de Melo

perf arm-spe: Don't warn about the discard bit if it doesn't exist

2026-05-30T00:20:50+00:00

Opening an SPE event shows a warning that doesn't concern the user: $ perf record -e arm_spe Unknown/empty format name: discard Perf only wants to know if the discard bit is set for configuring the event, not in response to anything the user has done. Fix it by adding another helper that returns if a config bit exists without warning. We should probably keep the warning in evsel__get_config_val() to avoid having every caller having to do it, and most format bits should never be missing. Add a test for the new helper. Rename the parent test function to be more generic rather than adding a new one as it requires a lot of boilerplate. Reviewed-by: Ian Rogers Reviewed-by: Leo Yan Signed-off-by: James Clark Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Mark Rutland Cc: Mike Leach Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo

perf arch x86: Sort includes and add missed explicit dependencies

2026-05-27T11:20:14+00:00

Fix missing #includes found while cleaning the evsel/evlist header files. Sort the remaining header files for consistency with the rest of the code. Signed-off-by: Ian Rogers Acked-by: Namhyung Kim Cc: Adrian Hunter Cc: Alice Rogers Cc: Dapeng Mi Cc: Ingo Molnar Cc: James Clark Cc: Leo Yan Cc: Peter Zijlstra Cc: Thomas Richter Signed-off-by: Arnaldo Carvalho de Melo

perf arch arm: Sort includes and add missed explicit dependencies

2026-05-27T11:18:12+00:00

powerpc tools perf: Initialize error code in auxtrace_record_init function

2026-05-27T11:08:53+00:00

perf trace record fails some cases in powerpc # perf test "perf trace record and replay" 128: perf trace record and replay : FAILED! # perf trace record sleep 1 # echo $? 32 This is happening because of non-zero err value from auxtrace_record__init() function. static int record__auxtrace_init(struct record *rec) { int err; if ((rec->opts.auxtrace_snapshot_opts || rec->opts.auxtrace_sample_opts) && record__threads_enabled(rec)) { pr_err("AUX area tracing options are not available in parallel streaming mode.\n"); return -EINVAL; } if (!rec->itr) { rec->itr = auxtrace_record__init(rec->evlist, &err); if (err) return err; } Here "int err" is not initialised. The code expects "err" to be set from auxtrace_record__init() function. Update auxtrace_record__init() in arch/powerpc/util/auxtrace.c to clear err value in the beginning. - Clear err value in beginning of function. Any fail later will set appropriate return code to err. - Even if we haven't found any event for auxtrace, perf record should continue for other events. NULL return will indicate that there is no auxtrace record initialized. - Not having "err" set here will affect monitoring of other events also because perf record will fail seeing random value in err. Set err to -EINVAL before invoking auxtrace_record__init() in builtin-record.c With the fix, # perf trace record sleep 1 [ perf record: Woken up 2 times to write data ] [ perf record: Captured and wrote 0.033 MB perf.data (228 samples) ] Fixes: 1dbfaf94cf66ec4b ("perf powerpc: Add basic CONFIG_AUXTRACE support for VPA pmu on powerpc") Reviewed-by: Adrian Hunter Signed-off-by: Athira Rajeev Acked-by: Namhyung Kim Cc: Athira Rajeev Cc: Hari Bathini Cc: Ian Rogers Cc: Jiri Olsa Cc: linuxppc-dev@lists.ozlabs.org Cc: Madhavan Srinivasan Cc: Michael Petlan Cc: Shivani Nittor Cc: Tanushree Shah Cc: Tejas Manhas Cc: Thomas Richter Signed-off-by: Arnaldo Carvalho de Melo

perf riscv: Fix discarded const qualifier in _get_field()

2026-05-23T22:45:39+00:00

The assignment of strrchr() return values to non-const char * variables triggers a -Werror=discarded-qualifiers warning when building with GCC 14. This happens because in newer glibc versions, strrchr() returns a 'const char *' if the input string is const. Properly declare 'line2' and 'nl' as const char * to match the glibc function signature and ensure type safety. This avoids the need for explicit type casting and aligns with the design pattern of not modifying read-only memory in the perf tool. Reviewed-by: Ian Rogers Signed-off-by: Li Guan Cc: Adrian Hunter Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Signed-off-by: Arnaldo Carvalho de Melo

perf test amd ibs: Fix incorrect kernel version check

2026-05-23T00:30:38+00:00

"AMD IBS sample period" unit test is getting skipped on kernel v7.x. Fix the kernel version >= v6.15 check. Fixes: 21fb366b2f457611 ("perf test amd: Skip amd-ibs-period test on kernel < v6.15") Signed-off-by: Ravi Bangoria Acked-by: Namhyung Kim Cc: Ananth Narayan Cc: Dapeng Mi Cc: Ian Rogers Cc: Ingo Molnar Cc: James Clark Cc: Manali Shukla Cc: Peter Zijlstra Cc: Ravi Bangoria Cc: Sandipan Das Cc: Santosh Shukla Signed-off-by: Arnaldo Carvalho de Melo

perf arch x86 tests: Add test for topdown event sorting

2026-05-20T21:24:01+00:00

Add a test to capture the comment in tools/perf/arch/x86/util/evlist.c. Test that slots and topdown-retiring get appropriately sorted with respect to instructions when they're all specified together. When the PMU requires topdown event grouping (indicated by the pressence of the slots event) metric events should be after slots, which should be the group leader. Add a related test that when the slots event isn't given it is injected into the appropriate group. Signed-off-by: Ian Rogers Tested-by: Zide Chen Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Collin Funk Cc: Dmitrii Dolgov <9erthalion6@gmail.com> Cc: German Gomez Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Signed-off-by: Arnaldo Carvalho de Melo