[PATCH 6.6 175/393] perf machine: Dont ignore _etext when not a text symbol

[Greg Kroah-Hartman]

6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christophe Leroy <christophe.leroy at csgroup.eu>

[ Upstream commit 7a93786c306296f15e728b1dbd949a319e4e3d19 ]

Depending on how vmlinux.lds is written, _etext might be the very first
data symbol instead of the very last text symbol.

Don't require it to be a text symbol, accept any symbol type.

Comitter notes:

See the first Link for further discussion, but it all boils down to
this:

 ---
  # grep -e _stext -e _etext -e _edata /proc/kallsyms
  c0000000 T _stext
  c08b8000 D _etext

  So there is no _edata and _etext is not text

  $ ppc-linux-objdump -x vmlinux | grep -e _stext -e _etext -e _edata
  c0000000 g       .head.text	00000000 _stext
  c08b8000 g       .rodata	00000000 _etext
  c1378000 g       .sbss	00000000 _edata
 ---

Fixes: ed9adb2035b5be58 ("perf machine: Read also the end of the kernel")
Signed-off-by: Christophe Leroy <christophe.leroy at csgroup.eu>
Cc: Adrian Hunter <adrian.hunter at intel.com>
Cc: Alexander Shishkin <alexander.shishkin at linux.intel.com>
Cc: Ian Rogers <irogers at google.com>
Cc: Ingo Molnar <mingo at redhat.com>
Cc: Jiri Olsa <jolsa at kernel.org>
Cc: Kan Liang <kan.liang at linux.intel.com>
Cc: linuxppc-dev at lists.ozlabs.org
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: Namhyung Kim <namhyung at kernel.org>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Song Liu <songliubraving at fb.com>
Link: https://lore.kernel.org/r/b3ee1994d95257cb7f2de037c5030ba7d1bed404.1736327613.git.christophe.leroy@csgroup.eu
Signed-off-by: Arnaldo Carvalho de Melo <acme at redhat.com>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 tools/perf/util/machine.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 7c6874804660e..e2a6facd1c4e2 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1217,7 +1217,7 @@ static int machine__get_running_kernel_start(struct machine *machine,
 
 	err = kallsyms__get_symbol_start(filename, "_edata", &addr);
 	if (err)
-		err = kallsyms__get_function_start(filename, "_etext", &addr);
+		err = kallsyms__get_symbol_start(filename, "_etext", &addr);
 	if (!err)
 		*end = addr;
 
-- 
2.39.5