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

Pull RCU updates from Ingo Molnar:
 - add RCU torture scripts/tooling
 - static analysis improvements
 - update RCU documentation
 - miscellaneous fixes

* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (52 commits)
  rcu: Remove "extern" from function declarations in kernel/rcu/rcu.h
  rcu: Remove "extern" from function declarations in include/linux/*rcu*.h
  rcu/torture: Dynamically allocate SRCU output buffer to avoid overflow
  rcu: Don't activate RCU core on NO_HZ_FULL CPUs
  rcu: Warn on allegedly impossible rcu_read_unlock_special() from irq
  rcu: Add an RCU_INITIALIZER for global RCU-protected pointers
  rcu: Make rcu_assign_pointer's assignment volatile and type-safe
  bonding: Use RCU_INIT_POINTER() for better overhead and for sparse
  rcu: Add comment on evaluate-once properties of rcu_assign_pointer().
  rcu: Provide better diagnostics for blocking in RCU callback functions
  rcu: Improve SRCU's grace-period comments
  rcu: Fix CONFIG_RCU_FANOUT_EXACT for odd fanout/leaf values
  rcu: Fix coccinelle warnings
  rcutorture: Stop tracking FSF's postal address
  rcutorture: Move checkarg to functions.sh
  rcutorture: Flag errors and warnings with color coding
  rcutorture: Record results from repeated runs of the same test scenario
  rcutorture: Test summary at end of run with less chattiness
  rcutorture: Update comment in kvm.sh listing typical RCU trace events
  rcutorture: Add tracing-enabled version of TREE08
  ...

1 files changed, 198 insertions, 0 deletions

diff --git a/tools/testing/selftests/rcutorture/bin/functions.sh b/tools/testing/selftests/rcutorture/bin/functions.sh
new file mode 100644
index 00000000000..587561d7c03
--- /dev/null
+++ b/tools/testing/selftests/rcutorture/bin/functions.sh
@@ -0,0 +1,198 @@
+#!/bin/bash
+#
+# Shell functions for the rest of the scripts.
+#
+# 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, 2013
+#
+# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
+
+# bootparam_hotplug_cpu bootparam-string
+#
+# Returns 1 if the specified boot-parameter string tells rcutorture to
+# test CPU-hotplug operations.
+bootparam_hotplug_cpu () {
+	echo "$1" | grep -q "rcutorture\.onoff_"
+}
+
+# checkarg --argname argtype $# arg mustmatch cannotmatch
+#
+# Checks the specified argument "arg" against the mustmatch and cannotmatch
+# patterns.
+checkarg () {
+	if test $3 -le 1
+	then
+		echo $1 needs argument $2 matching \"$5\"
+		usage
+	fi
+	if echo "$4" | grep -q -e "$5"
+	then
+		:
+	else
+		echo $1 $2 \"$4\" must match \"$5\"
+		usage
+	fi
+	if echo "$4" | grep -q -e "$6"
+	then
+		echo $1 $2 \"$4\" must not match \"$6\"
+		usage
+	fi
+}
+
+# configfrag_boot_params bootparam-string config-fragment-file
+#
+# Adds boot parameters from the .boot file, if any.
+configfrag_boot_params () {
+	if test -r "$2.boot"
+	then
+		echo $1 `grep -v '^#' "$2.boot" | tr '\012' ' '`
+	else
+		echo $1
+	fi
+}
+
+# configfrag_hotplug_cpu config-fragment-file
+#
+# Returns 1 if the config fragment specifies hotplug CPU.
+configfrag_hotplug_cpu () {
+	if test ! -r "$1"
+	then
+		echo Unreadable config fragment "$1" 1>&2
+		exit -1
+	fi
+	grep -q '^CONFIG_HOTPLUG_CPU=y$' "$1"
+}
+
+# identify_qemu builddir
+#
+# Returns our best guess as to which qemu command is appropriate for
+# the kernel at hand.  Override with the RCU_QEMU_CMD environment variable.
+identify_qemu () {
+	local u="`file "$1"`"
+	if test -n "$RCU_QEMU_CMD"
+	then
+		echo $RCU_QEMU_CMD
+	elif echo $u | grep -q x86-64
+	then
+		echo qemu-system-x86_64
+	elif echo $u | grep -q "Intel 80386"
+	then
+		echo qemu-system-i386
+	elif uname -a | grep -q ppc64
+	then
+		echo qemu-system-ppc64
+	else
+		echo Cannot figure out what qemu command to use! 1>&2
+		# Usually this will be one of /usr/bin/qemu-system-*
+		# Use RCU_QEMU_CMD environment variable or appropriate
+		# argument to top-level script.
+		exit 1
+	fi
+}
+
+# identify_qemu_append qemu-cmd
+#
+# Output arguments for the qemu "-append" string based on CPU type
+# and the RCU_QEMU_INTERACTIVE environment variable.
+identify_qemu_append () {
+	case "$1" in
+	qemu-system-x86_64|qemu-system-i386)
+		echo noapic selinux=0 initcall_debug debug
+		;;
+	esac
+	if test -n "$RCU_QEMU_INTERACTIVE"
+	then
+		echo root=/dev/sda
+	else
+		echo console=ttyS0
+	fi
+}
+
+# identify_qemu_args qemu-cmd serial-file
+#
+# Output arguments for qemu arguments based on the RCU_QEMU_MAC
+# and RCU_QEMU_INTERACTIVE environment variables.
+identify_qemu_args () {
+	case "$1" in
+	qemu-system-x86_64|qemu-system-i386)
+		;;
+	qemu-system-ppc64)
+		echo -enable-kvm -M pseries -cpu POWER7 -nodefaults
+		echo -device spapr-vscsi
+		if test -n "$RCU_QEMU_INTERACTIVE" -a -n "$RCU_QEMU_MAC"
+		then
+			echo -device spapr-vlan,netdev=net0,mac=$RCU_QEMU_MAC
+			echo -netdev bridge,br=br0,id=net0
+		elif test -n "$RCU_QEMU_INTERACTIVE"
+		then
+			echo -net nic -net user
+		fi
+		;;
+	esac
+	if test -n "$RCU_QEMU_INTERACTIVE"
+	then
+		echo -monitor stdio -serial pty -S
+	else
+		echo -serial file:$2
+	fi
+}
+
+# identify_qemu_vcpus
+#
+# Returns the number of virtual CPUs available to the aggregate of the
+# guest OSes.
+identify_qemu_vcpus () {
+	lscpu | grep '^CPU(s):' | sed -e 's/CPU(s)://'
+}
+
+# print_bug
+#
+# Prints "BUG: " in red followed by remaining arguments
+print_bug () {
+	printf '\033[031mBUG: \033[m'
+	echo $*
+}
+
+# print_warning
+#
+# Prints "WARNING: " in yellow followed by remaining arguments
+print_warning () {
+	printf '\033[033mWARNING: \033[m'
+	echo $*
+}
+
+# specify_qemu_cpus qemu-cmd qemu-args #cpus
+#
+# Appends a string containing "-smp XXX" to qemu-args, unless the incoming
+# qemu-args already contains "-smp".
+specify_qemu_cpus () {
+	local nt;
+
+	if echo $2 | grep -q -e -smp
+	then
+		echo $2
+	else
+		case "$1" in
+		qemu-system-x86_64|qemu-system-i386)
+			echo $2 -smp $3
+			;;
+		qemu-system-ppc64)
+			nt="`lscpu | grep '^NUMA node0' | sed -e 's/^[^,]*,\([0-9]*\),.*$/\1/'`"
+			echo $2 -smp cores=`expr \( $3 + $nt - 1 \) / $nt`,threads=$nt
+			;;
+		esac
+	fi
+}