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#!/bin/bash # SPDX-License-Identifier: GPL-2.0-only # udelay() test script # # Test is executed by writing and reading to /sys/kernel/debug/udelay_test # and exercises a variety of delays to ensure that udelay() is delaying # at least as long as requested (as compared to ktime). # # Copyright (C) 2014 Google, Inc. # MODULE_NAME=udelay_test UDELAY_PATH=/sys/kernel/debug/udelay_test setup() { /sbin/modprobe -q $MODULE_NAME tmp_file=`mktemp` } test_one() { delay=$1 echo $delay > $UDELAY_PATH tee -a $tmp_file < $UDELAY_PATH } cleanup() { if [ -f $tmp_file ]; then rm $tmp_file fi /sbin/modprobe -q -r $MODULE_NAME } trap cleanup EXIT setup # Delay for a variety of times. # 1..200, 200..500 (by 10), 500..2000 (by 100) for (( delay = 1; delay < 200; delay += 1 ))