[tip: perf/urgent] scripts/faddr2line: Add CONFIG_DEBUG_INFO check

["tip-bot2 for Josh Poimboeuf" <tip-bot2@linutronix.de>]

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     a41a2e2e34a907bd8979a53c58f44287630616e8
Gitweb:        https://git.kernel.org/tip/a41a2e2e34a907bd8979a53c58f44287630616e8
Author:        Josh Poimboeuf <jpoimboe@kernel.org>
AuthorDate:    Thu, 21 Jul 2022 11:01:24 -07:00
Committer:     Ingo Molnar <mingo@kernel.org>
CommitterDate: Tue, 02 Aug 2022 22:08:17 +02:00

scripts/faddr2line: Add CONFIG_DEBUG_INFO check

Otherwise without DWARF it spits out gibberish and gives no indication
of what the problem is.

Suggested-by: John Garry <john.garry@huawei.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/ffa7734c929445caa374bf9e68078300174f09b4.1658426357.git.jpoimboe@kernel.org
---
 scripts/faddr2line | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scripts/faddr2line b/scripts/faddr2line
index 5709968..5514c23 100755
--- a/scripts/faddr2line
+++ b/scripts/faddr2line
@@ -61,6 +61,7 @@ die() {
 READELF="${CROSS_COMPILE:-}readelf"
 ADDR2LINE="${CROSS_COMPILE:-}addr2line"
 AWK="awk"
+GREP="grep"
 
 command -v ${AWK} >/dev/null 2>&1 || die "${AWK} isn't installed"
 command -v ${READELF} >/dev/null 2>&1 || die "${READELF} isn't installed"
@@ -271,6 +272,8 @@ LIST=0
 [[ ! -f $objfile ]] && die "can't find objfile $objfile"
 shift
 
+${READELF} --section-headers --wide $objfile | ${GREP} -q '\.debug_info' || die "CONFIG_DEBUG_INFO not enabled"
+
 DIR_PREFIX=supercalifragilisticexpialidocious
 find_dir_prefix $objfile