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perf tests: Don't tail call optimize in unwind test 

The tail call optimization can unexpectedly make the stack smaller and
cause the test to fail.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: clang-built-linux@googlegroups.com
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Monnet <quentin@isovalent.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20200530082015.39162-3-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2020-05-30 01:20:14 -07:00 committed by Arnaldo Carvalho de Melo
parent 21f2b7c133
commit 8617e2e34f
1 changed files with 5 additions and 5 deletions
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10
tools/perf/tests/dwarf-unwind.c
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@ -94,7 +94,7 @@ static int unwind_entry(struct unwind_entry *entry, void *arg)
return strcmp((const char *) symbol, funcs[idx]);
}
noinline int test_dwarf_unwind__thread(struct thread *thread)
__no_tail_call noinline int test_dwarf_unwind__thread(struct thread *thread)
{
struct perf_sample sample;
unsigned long cnt = 0;
@ -125,7 +125,7 @@ noinline int test_dwarf_unwind__thread(struct thread *thread)
static int global_unwind_retval = -INT_MAX;
noinline int test_dwarf_unwind__compare(void *p1, void *p2)
__no_tail_call noinline int test_dwarf_unwind__compare(void *p1, void *p2)
{
/* Any possible value should be 'thread' */
struct thread *thread = *(struct thread **)p1;
@ -144,7 +144,7 @@ noinline int test_dwarf_unwind__compare(void *p1, void *p2)
return p1 - p2;
}
noinline int test_dwarf_unwind__krava_3(struct thread *thread)
__no_tail_call noinline int test_dwarf_unwind__krava_3(struct thread *thread)
{
struct thread *array[2] = {thread, thread};
void *fp = &bsearch;
@ -163,12 +163,12 @@ noinline int test_dwarf_unwind__krava_3(struct thread *thread)
return global_unwind_retval;
}
noinline int test_dwarf_unwind__krava_2(struct thread *thread)
__no_tail_call noinline int test_dwarf_unwind__krava_2(struct thread *thread)
{
return test_dwarf_unwind__krava_3(thread);
}
noinline int test_dwarf_unwind__krava_1(struct thread *thread)
__no_tail_call noinline int test_dwarf_unwind__krava_1(struct thread *thread)
{
return test_dwarf_unwind__krava_2(thread);
}