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tools/memory-model: Use "-unroll 0" to keep --hw runs finite 

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>
This commit is contained in:
Paul E. McKenney 2019-06-24 22:30:32 -07:00
parent 72b5f102f8
commit 719bef0cbe
1 changed files with 1 additions and 1 deletions
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2
tools/memory-model/scripts/runlitmus.sh
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@ -75,6 +75,6 @@ then
cp $T/$hwlitmusfile.jingle7.out $LKMM_DESTDIR/$hwlitmus.err
exit 253
fi
/usr/bin/time $LKMM_TIMEOUT_CMD herd7 $LKMM_DESTDIR/$hwlitmus > $LKMM_DESTDIR/$hwlitmus.out 2>&1
/usr/bin/time $LKMM_TIMEOUT_CMD herd7 -unroll 0 $LKMM_DESTDIR/$hwlitmus > $LKMM_DESTDIR/$hwlitmus.out 2>&1
exit $?