Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull RCU updates from Ingo Molnad:
 "The main RCU related changes in this cycle were:

   - Removal of spin_unlock_wait()
   - SRCU updates
   - RCU torture-test updates
   - RCU Documentation updates
   - Extend the sys_membarrier() ABI with the MEMBARRIER_CMD_PRIVATE_EXPEDITED variant
   - Miscellaneous RCU fixes
   - CPU-hotplug fixes"

* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (63 commits)
  arch: Remove spin_unlock_wait() arch-specific definitions
  locking: Remove spin_unlock_wait() generic definitions
  drivers/ata: Replace spin_unlock_wait() with lock/unlock pair
  ipc: Replace spin_unlock_wait() with lock/unlock pair
  exit: Replace spin_unlock_wait() with lock/unlock pair
  completion: Replace spin_unlock_wait() with lock/unlock pair
  doc: Set down RCU's scheduling-clock-interrupt needs
  doc: No longer allowed to use rcu_dereference on non-pointers
  doc: Add RCU files to docbook-generation files
  doc: Update memory-barriers.txt for read-to-write dependencies
  doc: Update RCU documentation
  membarrier: Provide expedited private command
  rcu: Remove exports from rcu_idle_exit() and rcu_idle_enter()
  rcu: Add warning to rcu_idle_enter() for irqs enabled
  rcu: Make rcu_idle_enter() rely on callers disabling irqs
  rcu: Add assertions verifying blocked-tasks list
  rcu/tracing: Set disable_rcu_irq_enter on rcu_eqs_exit()
  rcu: Add TPS() protection for _rcu_barrier_trace strings
  rcu: Use idle versions of swait to make idle-hack clear
  swait: Add idle variants which don't contribute to load average
  ...

10 files changed, 150 insertions, 51 deletions

diff --git a/tools/testing/selftests/rcutorture/bin/config_override.sh b/tools/testing/selftests/rcutorture/bin/config_override.sh
new file mode 100755
index 000000000000..49fa51726ce3
--- /dev/null
+++ b/tools/testing/selftests/rcutorture/bin/config_override.sh
@@ -0,0 +1,61 @@
+#!/bin/bash
+#
+# config_override.sh base override
+#
+# Combines base and override, removing any Kconfig options from base
+# that conflict with any in override, concatenating what remains and
+# sending the result to standard output.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, you can access it online at
+# http://www.gnu.org/licenses/gpl-2.0.html.
+#
+# Copyright (C) IBM Corporation, 2017
+#
+# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
+
+base=$1
+if test -r $base
+then
+	:
+else
+	echo Base file $base unreadable!!!
+	exit 1
+fi
+
+override=$2
+if test -r $override
+then
+	:
+else
+	echo Override file $override unreadable!!!
+	exit 1
+fi
+
+T=/tmp/config_override.sh.$$
+trap 'rm -rf $T' 0
+mkdir $T
+
+sed < $override -e 's/^/grep -v "/' -e 's/=.*$/="/' |
+	awk '
+	{
+		if (last)
+			print last " |";
+		last = $0;
+	}
+	END {
+		if (last)
+			print last;
+	}' > $T/script
+sh $T/script < $base
+cat $override
diff --git a/tools/testing/selftests/rcutorture/bin/functions.sh b/tools/testing/selftests/rcutorture/bin/functions.sh
index 1426a9b97494..07a13779eece 100644
--- a/tools/testing/selftests/rcutorture/bin/functions.sh
+++ b/tools/testing/selftests/rcutorture/bin/functions.sh
@@ -66,9 +66,34 @@ configfrag_boot_params () {
 
 # configfrag_boot_cpus bootparam-string config-fragment-file config-cpus
 #
-# Decreases number of CPUs based on any maxcpus= boot parameters specified.
+# Decreases number of CPUs based on any nr_cpus= boot parameters specified.
 configfrag_boot_cpus () {
 	local bootargs="`configfrag_boot_params "$1" "$2"`"
+	local nr_cpus
+	if echo "${bootargs}" | grep -q 'nr_cpus=[0-9]'
+	then
+		nr_cpus="`echo "${bootargs}" | sed -e 's/^.*nr_cpus=\([0-9]*\).*$/\1/'`"
+		if test "$3" -gt "$nr_cpus"
+		then
+			echo $nr_cpus
+		else
+			echo $3
+		fi
+	else
+		echo $3
+	fi
+}
+
+# configfrag_boot_maxcpus bootparam-string config-fragment-file config-cpus
+#
+# Decreases number of CPUs based on any maxcpus= boot parameters specified.
+# This allows tests where additional CPUs come online later during the
+# test run.  However, the torture parameters will be set based on the
+# number of CPUs initially present, so the scripting should schedule
+# test runs based on the maxcpus= boot parameter controlling the initial
+# number of CPUs instead of on the ultimate number of CPUs.
+configfrag_boot_maxcpus () {
+	local bootargs="`configfrag_boot_params "$1" "$2"`"
 	local maxcpus
 	if echo "${bootargs}" | grep -q 'maxcpus=[0-9]'
 	then
diff --git a/tools/testing/selftests/rcutorture/bin/kvm-build.sh b/tools/testing/selftests/rcutorture/bin/kvm-build.sh
index c29f2ec0bf9f..46752c164676 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm-build.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm-build.sh
@@ -2,7 +2,7 @@
 #
 # Build a kvm-ready Linux kernel from the tree in the current directory.
 #
-# Usage: kvm-build.sh config-template build-dir more-configs
+# Usage: kvm-build.sh config-template build-dir
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -34,24 +34,17 @@ then
 	echo "kvm-build.sh :$builddir: Not a writable directory, cannot build into it"
 	exit 1
 fi
-moreconfigs=${3}
-if test -z "$moreconfigs" -o ! -r "$moreconfigs"
-then
-	echo "kvm-build.sh :$moreconfigs: Not a readable file"
-	exit 1
-fi
 
 T=/tmp/test-linux.sh.$$
 trap 'rm -rf $T' 0
 mkdir $T
 
-grep -v 'CONFIG_[A-Z]*_TORTURE_TEST=' < ${config_template} > $T/config
+cp ${config_template} $T/config
 cat << ___EOF___ >> $T/config
 CONFIG_INITRAMFS_SOURCE="$TORTURE_INITRD"
 CONFIG_VIRTIO_PCI=y
 CONFIG_VIRTIO_CONSOLE=y
 ___EOF___
-cat $moreconfigs >> $T/config
 
 configinit.sh $T/config O=$builddir
 retval=$?
diff --git a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
index 93eede4e8fbe..0af36a721b9c 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
@@ -40,7 +40,7 @@
 
 T=/tmp/kvm-test-1-run.sh.$$
 trap 'rm -rf $T' 0
-touch $T
+mkdir $T
 
 . $KVM/bin/functions.sh
 . $CONFIGFRAG/ver_functions.sh
@@ -60,37 +60,33 @@ then
 	echo "kvm-test-1-run.sh :$resdir: Not a writable directory, cannot store results into it"
 	exit 1
 fi
-cp $config_template $resdir/ConfigFragment
 echo ' ---' `date`: Starting build
 echo ' ---' Kconfig fragment at: $config_template >> $resdir/log
+touch $resdir/ConfigFragment.input $resdir/ConfigFragment
 if test -r "$config_dir/CFcommon"
 then
-	cat < $config_dir/CFcommon >> $T
+	echo " --- $config_dir/CFcommon" >> $resdir/ConfigFragment.input
+	cat < $config_dir/CFcommon >> $resdir/ConfigFragment.input
+	config_override.sh $config_dir/CFcommon $config_template > $T/Kc1
+	grep '#CHECK#' $config_dir/CFcommon >> $resdir/ConfigFragment
+else
+	cp $config_template $T/Kc1
 fi
-# Optimizations below this point
-# CONFIG_USB=n
-# CONFIG_SECURITY=n
-# CONFIG_NFS_FS=n
-# CONFIG_SOUND=n
-# CONFIG_INPUT_JOYSTICK=n
-# CONFIG_INPUT_TABLET=n
-# CONFIG_INPUT_TOUCHSCREEN=n
-# CONFIG_INPUT_MISC=n
-# CONFIG_INPUT_MOUSE=n
-# # CONFIG_NET=n # disables console access, so accept the slower build.
-# CONFIG_SCSI=n
-# CONFIG_ATA=n
-# CONFIG_FAT_FS=n
-# CONFIG_MSDOS_FS=n
-# CONFIG_VFAT_FS=n
-# CONFIG_ISO9660_FS=n
-# CONFIG_QUOTA=n
-# CONFIG_HID=n
-# CONFIG_CRYPTO=n
-# CONFIG_PCCARD=n
-# CONFIG_PCMCIA=n
-# CONFIG_CARDBUS=n
-# CONFIG_YENTA=n
+echo " --- $config_template" >> $resdir/ConfigFragment.input
+cat $config_template >> $resdir/ConfigFragment.input
+grep '#CHECK#' $config_template >> $resdir/ConfigFragment
+if test -n "$TORTURE_KCONFIG_ARG"
+then
+	echo $TORTURE_KCONFIG_ARG | tr -s " " "\012" > $T/cmdline
+	echo " --- --kconfig argument" >> $resdir/ConfigFragment.input
+	cat $T/cmdline >> $resdir/ConfigFragment.input
+	config_override.sh $T/Kc1 $T/cmdline > $T/Kc2
+	# Note that "#CHECK#" is not permitted on commandline.
+else
+	cp $T/Kc1 $T/Kc2
+fi
+cat $T/Kc2 >> $resdir/ConfigFragment
+
 base_resdir=`echo $resdir | sed -e 's/\.[0-9]\+$//'`
 if test "$base_resdir" != "$resdir" -a -f $base_resdir/bzImage -a -f $base_resdir/vmlinux
 then
@@ -100,7 +96,9 @@ then
 	KERNEL=$base_resdir/${BOOT_IMAGE##*/} # use the last component of ${BOOT_IMAGE}
 	ln -s $base_resdir/Make*.out $resdir  # for kvm-recheck.sh
 	ln -s $base_resdir/.config $resdir  # for kvm-recheck.sh
-elif kvm-build.sh $config_template $builddir $T
+	# Arch-independent indicator
+	touch $resdir/builtkernel
+elif kvm-build.sh $T/Kc2 $builddir
 then
 	# Had to build a kernel for this test.
 	QEMU="`identify_qemu $builddir/vmlinux`"
@@ -112,6 +110,8 @@ then
 	then
 		cp $builddir/$BOOT_IMAGE $resdir
 		KERNEL=$resdir/${BOOT_IMAGE##*/}
+		# Arch-independent indicator
+		touch $resdir/builtkernel
 	else
 		echo No identifiable boot image, not running KVM, see $resdir.
 		echo Do the torture scripts know about your architecture?
@@ -149,7 +149,7 @@ fi
 
 # Generate -smp qemu argument.
 qemu_args="-enable-kvm -nographic $qemu_args"
-cpu_count=`configNR_CPUS.sh $config_template`
+cpu_count=`configNR_CPUS.sh $resdir/ConfigFragment`
 cpu_count=`configfrag_boot_cpus "$boot_args" "$config_template" "$cpu_count"`
 vcpus=`identify_qemu_vcpus`
 if test $cpu_count -gt $vcpus
diff --git a/tools/testing/selftests/rcutorture/bin/kvm.sh b/tools/testing/selftests/rcutorture/bin/kvm.sh
index 50091de3a911..b55895fb10ed 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm.sh
@@ -41,6 +41,7 @@ PATH=${KVM}/bin:$PATH; export PATH
 TORTURE_DEFCONFIG=defconfig
 TORTURE_BOOT_IMAGE=""
 TORTURE_INITRD="$KVM/initrd"; export TORTURE_INITRD
+TORTURE_KCONFIG_ARG=""
 TORTURE_KMAKE_ARG=""
 TORTURE_SHUTDOWN_GRACE=180
 TORTURE_SUITE=rcu
@@ -65,6 +66,7 @@ usage () {
 	echo "       --duration minutes"
 	echo "       --interactive"
 	echo "       --jitter N [ maxsleep (us) [ maxspin (us) ] ]"
+	echo "       --kconfig Kconfig-options"
 	echo "       --kmake-arg kernel-make-arguments"
 	echo "       --mac nn:nn:nn:nn:nn:nn"
 	echo "       --no-initrd"
@@ -129,6 +131,11 @@ do
 		jitter="$2"
 		shift
 		;;
+	--kconfig)
+		checkarg --kconfig "(Kconfig options)" $# "$2" '^CONFIG_[A-Z0-9_]\+=\([ynm]\|[0-9]\+\)\( CONFIG_[A-Z0-9_]\+=\([ynm]\|[0-9]\+\)\)*$' '^error$'
+		TORTURE_KCONFIG_ARG="$2"
+		shift
+		;;
 	--kmake-arg)
 		checkarg --kmake-arg "(kernel make arguments)" $# "$2" '.*' '^error$'
 		TORTURE_KMAKE_ARG="$2"
@@ -205,6 +212,7 @@ do
 	then
 		cpu_count=`configNR_CPUS.sh $CONFIGFRAG/$CF1`
 		cpu_count=`configfrag_boot_cpus "$TORTURE_BOOTARGS" "$CONFIGFRAG/$CF1" "$cpu_count"`
+		cpu_count=`configfrag_boot_maxcpus "$TORTURE_BOOTARGS" "$CONFIGFRAG/$CF1" "$cpu_count"`
 		for ((cur_rep=0;cur_rep<$config_reps;cur_rep++))
 		do
 			echo $CF1 $cpu_count >> $T/cfgcpu
@@ -275,6 +283,7 @@ TORTURE_BOOT_IMAGE="$TORTURE_BOOT_IMAGE"; export TORTURE_BOOT_IMAGE
 TORTURE_BUILDONLY="$TORTURE_BUILDONLY"; export TORTURE_BUILDONLY
 TORTURE_DEFCONFIG="$TORTURE_DEFCONFIG"; export TORTURE_DEFCONFIG
 TORTURE_INITRD="$TORTURE_INITRD"; export TORTURE_INITRD
+TORTURE_KCONFIG_ARG="$TORTURE_KCONFIG_ARG"; export TORTURE_KCONFIG_ARG
 TORTURE_KMAKE_ARG="$TORTURE_KMAKE_ARG"; export TORTURE_KMAKE_ARG
 TORTURE_QEMU_CMD="$TORTURE_QEMU_CMD"; export TORTURE_QEMU_CMD
 TORTURE_QEMU_INTERACTIVE="$TORTURE_QEMU_INTERACTIVE"; export TORTURE_QEMU_INTERACTIVE
@@ -324,6 +333,7 @@ function dump(first, pastlast, batchnum)
 {
 	print "echo ----Start batch " batchnum ": `date`";
 	print "echo ----Start batch " batchnum ": `date` >> " rd "/log";
+	print "needqemurun="
 	jn=1
 	for (j = first; j < pastlast; j++) {
 		builddir=KVM "/b" jn
@@ -359,10 +369,11 @@ function dump(first, pastlast, batchnum)
 	for (j = 1; j < jn; j++) {
 		builddir=KVM "/b" j
 		print "rm -f " builddir ".ready"
-		print "if test -z \"$TORTURE_BUILDONLY\""
+		print "if test -f \"" rd cfr[j] "/builtkernel\""
 		print "then"
-		print "\techo ----", cfr[j], cpusr[j] ovf ": Starting kernel. `date`";
-		print "\techo ----", cfr[j], cpusr[j] ovf ": Starting kernel. `date` >> " rd "/log";
+		print "\techo ----", cfr[j], cpusr[j] ovf ": Kernel present. `date`";
+		print "\techo ----", cfr[j], cpusr[j] ovf ": Kernel present. `date` >> " rd "/log";
+		print "\tneedqemurun=1"
 		print "fi"
 	}
 	njitter = 0;
@@ -377,13 +388,22 @@ function dump(first, pastlast, batchnum)
 		njitter = 0;
 		print "echo Build-only run, so suppressing jitter >> " rd "/log"
 	}
-	for (j = 0; j < njitter; j++)
-		print "jitter.sh " j " " dur " " ja[2] " " ja[3] "&"
-	print "wait"
-	print "if test -z \"$TORTURE_BUILDONLY\""
+	if (TORTURE_BUILDONLY) {
+		print "needqemurun="
+	}
+	print "if test -n \"$needqemurun\""
 	print "then"
+	print "\techo ---- Starting kernels. `date`";
+	print "\techo ---- Starting kernels. `date` >> " rd "/log";
+	for (j = 0; j < njitter; j++)
+		print "\tjitter.sh " j " " dur " " ja[2] " " ja[3] "&"
+	print "\twait"
 	print "\techo ---- All kernel runs complete. `date`";
 	print "\techo ---- All kernel runs complete. `date` >> " rd "/log";
+	print "else"
+	print "\twait"
+	print "\techo ---- No kernel runs. `date`";
+	print "\techo ---- No kernel runs. `date` >> " rd "/log";
 	print "fi"
 	for (j = 1; j < jn; j++) {
 		builddir=KVM "/b" j
diff --git a/tools/testing/selftests/rcutorture/configs/rcu/BUSTED.boot b/tools/testing/selftests/rcutorture/configs/rcu/BUSTED.boot
index 6804f9dcfc1b..be7728db42fd 100644
--- a/tools/testing/selftests/rcutorture/configs/rcu/BUSTED.boot
+++ b/tools/testing/selftests/rcutorture/configs/rcu/BUSTED.boot
@@ -1 +1 @@
-rcutorture.torture_type=rcu_busted
+rcutorture.torture_type=busted
diff --git a/tools/testing/selftests/rcutorture/configs/rcu/SRCU-C.boot b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-C.boot
deleted file mode 100644
index 84a7d51b7481..000000000000
--- a/tools/testing/selftests/rcutorture/configs/rcu/SRCU-C.boot
+++ /dev/null
@@ -1 +0,0 @@
-rcutorture.torture_type=srcud
diff --git a/tools/testing/selftests/rcutorture/configs/rcu/SRCU-u b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-u
index 6bc24e99862f..c15ada821e45 100644
--- a/tools/testing/selftests/rcutorture/configs/rcu/SRCU-u
+++ b/tools/testing/selftests/rcutorture/configs/rcu/SRCU-u
@@ -4,6 +4,7 @@ CONFIG_PREEMPT_VOLUNTARY=n
 CONFIG_PREEMPT=n
 #CHECK#CONFIG_TINY_SRCU=y
 CONFIG_RCU_TRACE=n
-CONFIG_DEBUG_LOCK_ALLOC=n
+CONFIG_DEBUG_LOCK_ALLOC=y
+CONFIG_PROVE_LOCKING=y
 CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
 CONFIG_PREEMPT_COUNT=n
diff --git a/tools/testing/selftests/rcutorture/configs/rcu/TREE01.boot b/tools/testing/selftests/rcutorture/configs/rcu/TREE01.boot
index 1d14e1383016..9f3a4d28e508 100644
--- a/tools/testing/selftests/rcutorture/configs/rcu/TREE01.boot
+++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE01.boot
@@ -1,4 +1,4 @@
-rcutorture.torture_type=rcu_bh maxcpus=8
+rcutorture.torture_type=rcu_bh maxcpus=8 nr_cpus=43
 rcutree.gp_preinit_delay=3
 rcutree.gp_init_delay=3
 rcutree.gp_cleanup_delay=3
diff --git a/tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt b/tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt
index 9ad3f89c8dc7..af6fca03602f 100644
--- a/tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt
+++ b/tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt
@@ -69,11 +69,11 @@ CONFIG_RCU_TORTURE_TEST_RUNNABLE
 CONFIG_PREEMPT_RCU
 CONFIG_TREE_RCU
 CONFIG_TINY_RCU
+CONFIG_TASKS_RCU
 
 	These are controlled by CONFIG_PREEMPT and/or CONFIG_SMP.
 
 CONFIG_SRCU
-CONFIG_TASKS_RCU
 
 	Selected by CONFIG_RCU_TORTURE_TEST, so cannot disable.