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Litmus tests involving atomic operations produce LL/SC loops on a number of architectures, and unrolling these loops can result in excessive verification times or even stack overflows. This commit therefore uses the "-unroll 0" herd7 argument to avoid unrolling, on the grounds that additional passes through an LL/SC loop should not change the verification. Note however, that certain bugs in the mapping of the LL/SC loop to machine instructions may go undetected. On the other hand, herd7 might not be the best vehicle for finding such bugs in any case. (You do stress-test your architecture-specific code, don't you?) Suggested-by: Luc Maranget <luc.maranget@inria.fr> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
80 lines
2.4 KiB
Bash
Executable file
80 lines
2.4 KiB
Bash
Executable file
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0+
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#
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# Without the -hw argument, runs a herd7 test and outputs verification
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# results to a file whose name is that of the specified litmus test,
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# but with ".out" appended.
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#
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# If the --hw argument is specified, this script translates the .litmus
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# C-language file to the specified type of assembly and verifies that.
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# But in this case, litmus tests using complex synchronization (such as
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# locking, RCU, and SRCU) are cheerfully ignored.
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#
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# Either way, return the status of the herd7 command.
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#
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# Usage:
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# runlitmus.sh file.litmus
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#
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# Run this in the directory containing the memory model, specifying the
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# pathname of the litmus test to check. The caller is expected to have
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# properly set up the LKMM environment variables.
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#
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# Copyright IBM Corporation, 2019
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#
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# Author: Paul E. McKenney <paulmck@linux.ibm.com>
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litmus=$1
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if test -f "$litmus" -a -r "$litmus"
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then
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:
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else
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echo ' !!! ' error: \"$litmus\" is not a readable file
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exit 255
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fi
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if test -z "$LKMM_HW_MAP_FILE" -o ! -e $LKMM_DESTDIR/$litmus.out
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then
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# LKMM run
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herdoptions=${LKMM_HERD_OPTIONS--conf linux-kernel.cfg}
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echo Herd options: $herdoptions > $LKMM_DESTDIR/$litmus.out
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/usr/bin/time $LKMM_TIMEOUT_CMD herd7 $herdoptions $litmus >> $LKMM_DESTDIR/$litmus.out 2>&1
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ret=$?
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if test -z "$LKMM_HW_MAP_FILE"
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then
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exit $ret
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fi
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echo " --- " Automatically generated LKMM output for '"'--hw $LKMM_HW_MAP_FILE'"' run
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fi
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# Hardware run
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T=/tmp/checklitmushw.sh.$$
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trap 'rm -rf $T' 0 2
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mkdir $T
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# Generate filenames
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mapfile="Linux2${LKMM_HW_MAP_FILE}.map"
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themefile="$T/${LKMM_HW_MAP_FILE}.theme"
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herdoptions="-model $LKMM_HW_CAT_FILE"
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hwlitmus=`echo $litmus | sed -e 's/\.litmus$/.litmus.'${LKMM_HW_MAP_FILE}'/'`
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hwlitmusfile=`echo $hwlitmus | sed -e 's,^.*/,,'`
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# Don't run on litmus tests with complex synchronization
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if ! scripts/simpletest.sh $litmus
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then
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echo ' --- ' error: \"$litmus\" contains locking, RCU, or SRCU
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exit 254
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fi
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# Generate the assembly code and run herd7 on it.
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gen_theme7 -n 10 -map $mapfile -call Linux.call > $themefile
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jingle7 -v -theme $themefile $litmus > $LKMM_DESTDIR/$hwlitmus 2> $T/$hwlitmusfile.jingle7.out
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if grep -q "Generated 0 tests" $T/$hwlitmusfile.jingle7.out
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then
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echo ' !!! ' jingle7 failed, errors in $hwlitmus.err
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cp $T/$hwlitmusfile.jingle7.out $LKMM_DESTDIR/$hwlitmus.err
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exit 253
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fi
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/usr/bin/time $LKMM_TIMEOUT_CMD herd7 -unroll 0 $LKMM_DESTDIR/$hwlitmus > $LKMM_DESTDIR/$hwlitmus.out 2>&1
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exit $?
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