TEST_GEN_PROGS := hugetlb_vs_thp_test subpage_prot prot_sao segv_errors wild_bctr \
large_vm_fork_separation bad_accesses pkey_exec_prot \
pkey_siginfo stack_expansion_signal stack_expansion_ldst
+TEST_PROGS := stress_code_patching.sh
TEST_GEN_PROGS_EXTENDED := tlbie_test
TEST_GEN_FILES := tempfile
--- /dev/null
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+TIMEOUT=30
+
+DEBUFS_DIR=`cat /proc/mounts | grep debugfs | awk '{print $2}'`
+if [ ! -e "$DEBUFS_DIR" ]
+then
+ echo "debugfs not found, skipping" 1>&2
+ exit 4
+fi
+
+if [ ! -e "$DEBUFS_DIR/tracing/current_tracer" ]
+then
+ echo "Tracing files not found, skipping" 1>&2
+ exit 4
+fi
+
+
+echo "Testing for spurious faults when mapping kernel memory..."
+
+if grep -q "FUNCTION TRACING IS CORRUPTED" "$DEBUFS_DIR/tracing/trace"
+then
+ echo "FAILED: Ftrace already dead. Probably due to a spurious fault" 1>&2
+ exit 1
+fi
+
+dmesg -C
+START_TIME=`date +%s`
+END_TIME=`expr $START_TIME + $TIMEOUT`
+while [ `date +%s` -lt $END_TIME ]
+do
+ echo function > $DEBUFS_DIR/tracing/current_tracer
+ echo nop > $DEBUFS_DIR/tracing/current_tracer
+ if dmesg | grep -q 'ftrace bug'
+ then
+ break
+ fi
+done
+
+echo nop > $DEBUFS_DIR/tracing/current_tracer
+if dmesg | grep -q 'ftrace bug'
+then
+ echo "FAILED: Mapping kernel memory causes spurious faults" 1>&2
+ exit 1
+else
+ echo "OK: Mapping kernel memory does not cause spurious faults"
+ exit 0
+fi