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Date:   Thu, 06 Aug 2020 23:17:43 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     akpm@linux-foundation.org, khlebnikov@yandex-team.ru,
        linux-mm@kvack.org, mm-commits@vger.kernel.org, sashal@kernel.org,
        torvalds@linux-foundation.org
Subject:  [patch 013/163] scripts/decode_stacktrace.sh: guess path
 to vmlinux by release name
Message-ID: <20200807061743.TkcOXWDd2%akpm@linux-foundation.org>
In-Reply-To: <20200806231643.a2711a608dd0f18bff2caf2b@linux-foundation.org>
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From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Subject: scripts/decode_stacktrace.sh: guess path to vmlinux by release name

Add option decode_stacktrace -r <release> to specify only release name. 
This is enough to guess standard paths to vmlinux and modules:

$ echo -e 'schedule+0x0/0x0
tap_open+0x0/0x0 [tap]' |
	./scripts/decode_stacktrace.sh -r 5.4.0-37-generic
schedule (kernel/sched/core.c:4138)
tap_open (drivers/net/tap.c:502) tap

Link: http://lkml.kernel.org/r/159282923334.248444.2399153100007347838.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 |   29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

--- a/scripts/decode_stacktrace.sh~scripts-decode_stacktrace-guess-path-to-vmlinux-by-release-name
+++ a/scripts/decode_stacktrace.sh
@@ -5,14 +5,33 @@
 
 if [[ $# < 1 ]]; then
 	echo "Usage:"
-	echo "	$0 <vmlinux> [base path] [modules path]"
+	echo "	$0 -r <release> | <vmlinux> [base path] [modules path]"
 	exit 1
 fi
 
-vmlinux=$1
-basepath=${2-auto}
-modpath=$3
-release=""
+if [[ $1 == "-r" ]] ; then
+	vmlinux=""
+	basepath="auto"
+	modpath=""
+	release=$2
+
+	for fn in {,/usr/lib/debug}/boot/vmlinux-$release{,.debug} /lib/modules/$release{,/build}/vmlinux ; do
+		if [ -e "$fn" ] ; then
+			vmlinux=$fn
+			break
+		fi
+	done
+
+	if [[ $vmlinux == "" ]] ; then
+		echo "ERROR! vmlinux image for release $release is not found" >&2
+		exit 2
+	fi
+else
+	vmlinux=$1
+	basepath=${2-auto}
+	modpath=$3
+	release=""
+fi
 
 declare -A cache
 declare -A modcache
_