diff mbox series

[010/163] scripts/decode_stacktrace.sh: skip missing symbols

Message ID 20200807061735.tb6sJM1z7%akpm@linux-foundation.org (mailing list archive)
State New, archived
Headers show
Series [001/163] mm/memory.c: avoid access flag update TLB flush for retried page fault | expand

Commit Message

Andrew Morton Aug. 7, 2020, 6:17 a.m. UTC 
From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Subject: scripts/decode_stacktrace.sh: skip missing symbols

For now script turns missing symbols into '0' and make bogus decode.  Skip
them instead.  Also simplify parsing output of 'nm'.

Before:

$ echo 'xxx+0x0/0x0' | ./scripts/decode_stacktrace.sh vmlinux ""
xxx (home/khlebnikov/src/linux/./arch/x86/include/asm/processor.h:398)

After:

$ echo 'xxx+0x0/0x0' | ./scripts/decode_stacktrace.sh vmlinux ""
xxx+0x0/0x0

Link: http://lkml.kernel.org/r/159282922499.248444.4883465570858385250.stgit@buzz
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 scripts/decode_stacktrace.sh |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

--- a/scripts/decode_stacktrace.sh~scripts-decode_stacktrace-skip-missing-symbols
+++ a/scripts/decode_stacktrace.sh
@@ -56,7 +56,11 @@  parse_symbol() {
 	if [[ "${cache[$module,$name]+isset}" == "isset" ]]; then
 		local base_addr=${cache[$module,$name]}
 	else
-		local base_addr=$(nm "$objfile" | grep -i ' t ' | awk "/ $name\$/ {print \$1}" | head -n1)
+		local base_addr=$(nm "$objfile" | awk '$3 == "'$name'" && ($2 == "t" || $2 == "T") {print $1; exit}')
+		if [[ $base_addr == "" ]] ; then
+			# address not found
+			return
+		fi
 		cache[$module,$name]="$base_addr"
 	fi
 	# Let's start doing the math to get the exact address into the