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tools: rcu: Add usage function and check for argument

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This commit converts extract-stall.sh script's header comment to a
usage() function, and adds an argument check.  While in the area, make
this script be executable.

[ paulmck: Strength argument check, remove extraneous comment. ]

Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
This commit is contained in:
Bhaskar Chowdhury 2023-01-10 16:46:34 +05:30 committed by Boqun Feng
parent 7c3a8b48dc
commit 236bdb881d
1 changed files with 20 additions and 6 deletions
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26
tools/rcu/extract-stall.sh Normal file → Executable file
View File

@ -1,11 +1,25 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0+
#
# Extract any RCU CPU stall warnings present in specified file.
# Filter out clocksource lines. Note that preceding-lines excludes the
# initial line of the stall warning but trailing-lines includes it.
#
# Usage: extract-stall.sh dmesg-file [ preceding-lines [ trailing-lines ] ]
usage() {
echo Extract any RCU CPU stall warnings present in specified file.
echo Filter out clocksource lines. Note that preceding-lines excludes the
echo initial line of the stall warning but trailing-lines includes it.
echo
echo Usage: $(basename $0) dmesg-file [ preceding-lines [ trailing-lines ] ]
echo
echo Error: $1
}
# Terminate the script, if the argument is missing
if test -f "$1" && test -r "$1"
then
:
else
usage "Console log file \"$1\" missing or unreadable."
exit 1
fi
echo $1
preceding_lines="${2-3}"