powerpc/mm/stress_code_patching.sh

0001 #!/bin/bash
0002 # SPDX-License-Identifier: GPL-2.0-or-later
0003
0004 TIMEOUT=30
0005
0006 DEBUFS_DIR=`cat /proc/mounts | grep debugfs | awk '{print $2}'`
0007 if [ ! -e "$DEBUFS_DIR" ]
0008 then
0009         echo "debugfs not found, skipping" 1>&2
0010         exit 4
0011 fi
0012
0013 if [ ! -e "$DEBUFS_DIR/tracing/current_tracer" ]
0014 then
0015         echo "Tracing files not found, skipping" 1>&2
0016         exit 4
0017 fi
0018
0019
0020 echo "Testing for spurious faults when mapping kernel memory..."
0021
0022 if grep -q "FUNCTION TRACING IS CORRUPTED" "$DEBUFS_DIR/tracing/trace"
0023 then
0024         echo "FAILED: Ftrace already dead. Probably due to a spurious fault" 1>&2
0025         exit 1
0026 fi
0027
0028 dmesg -C
0029 START_TIME=`date +%s`
0030 END_TIME=`expr $START_TIME + $TIMEOUT`
0031 while [ `date +%s` -lt $END_TIME ]
0032 do
0033         echo function > $DEBUFS_DIR/tracing/current_tracer
0034         echo nop > $DEBUFS_DIR/tracing/current_tracer
0035         if dmesg | grep -q 'ftrace bug'
0036         then
0037                 break
0038         fi
0039 done
0040
0041 echo nop > $DEBUFS_DIR/tracing/current_tracer
0042 if dmesg | grep -q 'ftrace bug'
0043 then
0044         echo "FAILED: Mapping kernel memory causes spurious faults" 1>&2
0045         exit 1
0046 else
0047         echo "OK: Mapping kernel memory does not cause spurious faults"
0048         exit 0
0049 fi