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ab6e9a9934
linux/tools/perf/tests
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Jiri Olsa ab6e9a9934 perf tests: Use arch__compare_symbol_names to compare symbols 
The symbol search called by machine__find_kernel_symbol_by_name is using
internally arch__compare_symbol_names function to compare 2 symbol
names, because different archs have different ways of comparing symbols.
Mostly for skipping '.' prefixes and similar.

In test 1 when we try to find matching symbols in kallsyms and vmlinux,
by address and by symbol name. When either is found we compare the pair
symbol names  by simple strcmp, which is not good enough for reasons
explained in previous paragraph.

On powerpc this can cause lockup, because even thought we found the
pair, the compared names are different and don't match simple strcmp.
Following code path is executed, that leads to lockup:

   - we find the pair in kallsyms by sym->start
next_pair:
   - we compare the names and it fails
   - we find the pair by sym->name
   - the pair addresses match so we call goto next_pair
     because we assume the names match in this case

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Fixes: 031b84c407 ("perf probe ppc: Enable matching against dot symbols automatically")
Link: http://lkml.kernel.org/r/20180215122635.24029-10-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2018-02-16 14:26:01 -03:00
..
attr perf tests attr: Make hw events optional 2017-10-23 11:20:54 -03:00
shell perf test: Fix test trace+probe_libc_inet_pton.sh for s390x 2018-02-15 09:57:47 -03:00
.gitignore perf test: Add libbpf relocation checker 2016-01-26 12:10:55 -03:00
attr.c perf tests: Add missing WRITE_ASS for new fields of perf_event_attr 2017-11-16 14:49:53 -03:00
attr.py Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
backward-ring-buffer.c perf test: Update mmap read functions for backward-ring-buffer test 2018-02-15 09:54:08 -03:00
bitmap.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
bp_signal_overflow.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
bp_signal.c perf test: Disable test cases 19 and 20 on s390x 2017-11-29 18:17:59 -03:00
bpf-script-example.c perf test bpf: Hook on epoll_pwait() 2018-01-08 11:11:57 -03:00
bpf-script-test-kbuild.c perf test: Enhance the LLVM tests: add kbuild test 2015-11-06 17:49:50 -03:00
bpf-script-test-prologue.c perf bpf: Fix endianness problem when loading parameters in prologue 2017-08-16 10:31:11 -03:00
bpf-script-test-relocation.c perf test: Add libbpf relocation checker 2016-01-26 12:10:55 -03:00
bpf.c perf evlist: Remove fcntl.h from evlist.h 2018-01-25 06:37:30 -03:00
Build perf test: Add test cases for new data source encoding 2017-08-22 13:23:10 -03:00
builtin-test.c perf test: Handle properly readdir DT_UNKNOWN 2017-12-27 12:15:48 -03:00
clang.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
code-reading.c perf evlist: Remove 'overwrite' parameter from perf_evlist__mmap 2017-12-05 15:43:53 -03:00
cpumap.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dso-data.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dwarf-unwind.c perf tests: Fix dwarf unwind for stripped binaries 2018-02-16 10:09:23 -03:00
event_update.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
event-times.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
evsel-roundtrip-name.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
evsel-tp-sched.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
expr.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fdarray.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hists_common.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hists_common.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hists_cumulate.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hists_filter.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hists_link.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hists_output.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
is_printable_array.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
keep-tracking.c perf evlist: Remove 'overwrite' parameter from perf_evlist__mmap 2017-12-05 15:43:53 -03:00
kmod-path.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
llvm.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
llvm.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
make Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2016-12-17 16:24:13 -08:00
mem.c perf test: Add test cases for new data source encoding 2017-08-22 13:23:10 -03:00
mmap-basic.c perf evlist: Remove 'overwrite' parameter from perf_evlist__mmap 2017-12-05 15:43:53 -03:00
mmap-thread-lookup.c Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
openat-syscall-all-cpus.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
openat-syscall-tp-fields.c perf evlist: Remove fcntl.h from evlist.h 2018-01-25 06:37:30 -03:00
openat-syscall.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
parse-events.c perf perf: Remove duplicate includes 2017-12-27 12:15:49 -03:00
parse-no-sample-id-all.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
perf-hooks.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
perf-record.c perf evlist: Remove 'overwrite' parameter from perf_evlist__mmap 2017-12-05 15:43:53 -03:00
perf-targz-src-pkg License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pmu.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
python-use.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sample-parsing.c perf tools: Get rid of unused 'swapped' parameter from perf_event__synthesize_sample() 2018-01-18 09:01:23 -03:00
sdt.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
stat.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sw-clock.c perf evlist: Remove 'overwrite' parameter from perf_evlist__mmap 2017-12-05 15:43:53 -03:00
switch-tracking.c perf evlist: Remove 'overwrite' parameter from perf_evlist__mmap 2017-12-05 15:43:53 -03:00
task-exit.c perf evlist: Remove 'overwrite' parameter from perf_evlist__mmap 2017-12-05 15:43:53 -03:00
tests.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
thread-map.c perf thread_map: Enumerate all threads from /proc 2017-12-27 12:15:46 -03:00
thread-mg-share.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
topology.c Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
unit_number__scnprintf.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vmlinux-kallsyms.c perf tests: Use arch__compare_symbol_names to compare symbols 2018-02-16 14:26:01 -03:00