linux-kernel - [PATCH rcu 12/18] torture: Loosen .config checks for KCSAN kernels

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Message-Id: <20230717182337.1098991-12-paulmck@kernel.org>
Date:   Mon, 17 Jul 2023 11:23:31 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...a.com,
        rostedt@...dmis.org, "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH rcu 12/18] torture: Loosen .config checks for KCSAN kernels

KCSAN enables some Kconfig options unilaterally and unconditionally,
including CONFIG_PROVE_LOCKING.  This in turn enables CONFIG_PROVE_RCU
and CONFIG_PREEMPT_COUNT, which conflicts with constraints in SRCU-T,
TRACE01, and TREE10, which in turn causes rcutorture to emit spurious
configuration complaints.  This commit therefore forgives configuration
complaints involving CONFIG_PROVE_RCU and CONFIG_PREEMPT_COUNT.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 tools/testing/selftests/rcutorture/bin/kvm-recheck.sh | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh b/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh
index 97bdacc3fc55..5be670dd4009 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh
@@ -52,6 +52,13 @@ do
 				echo QEMU killed
 			fi
 			configcheck.sh $i/.config $i/ConfigFragment > $i/ConfigFragment.diags 2>&1
+			if grep -q '^CONFIG_KCSAN=y$' $i/ConfigFragment.input
+			then
+				# KCSAN forces a number of Kconfig options, so remove
+				# complaints about those Kconfig options in KCSAN runs.
+				mv $i/ConfigFragment.diags $i/ConfigFragment.diags.kcsan
+				grep -v -E 'CONFIG_PROVE_RCU|CONFIG_PREEMPT_COUNT' $i/ConfigFragment.diags.kcsan > $i/ConfigFragment.diags
+			fi
 			if test -s $i/ConfigFragment.diags
 			then
 				cat $i/ConfigFragment.diags
-- 
2.40.1