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authorPranith Kumar <bobby.prani@gmail.com>2014-12-05 11:24:45 -0500
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2015-01-06 11:04:29 -0800
commit83fe27ea531161a655f02dc7732d14cfaa27fd5d (patch)
tree1f81714c3b10b76f483eea380b0eafe7cf84e75b
parent9735af5c78599703be633c057af3faee26482028 (diff)
downloadlinux-stericsson-83fe27ea531161a655f02dc7732d14cfaa27fd5d.tar.gz
rcu: Make SRCU optional by using CONFIG_SRCU
SRCU is not necessary to be compiled by default in all cases. For tinification efforts not compiling SRCU unless necessary is desirable. The current patch tries to make compiling SRCU optional by introducing a new Kconfig option CONFIG_SRCU which is selected when any of the components making use of SRCU are selected. If we do not select CONFIG_SRCU, srcu.o will not be compiled at all. text data bss dec hex filename 2007 0 0 2007 7d7 kernel/rcu/srcu.o Size of arch/powerpc/boot/zImage changes from text data bss dec hex filename 831552 64180 23944 919676 e087c arch/powerpc/boot/zImage : before 829504 64180 23952 917636 e0084 arch/powerpc/boot/zImage : after so the savings are about ~2000 bytes. Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com> CC: Josh Triplett <josh@joshtriplett.org> CC: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> [ paulmck: resolve conflict due to removal of arch/ia64/kvm/Kconfig. ]
-rw-r--r--arch/arm/kvm/Kconfig1
-rw-r--r--arch/arm64/kvm/Kconfig1
-rw-r--r--arch/mips/kvm/Kconfig1
-rw-r--r--arch/powerpc/kvm/Kconfig1
-rw-r--r--arch/s390/kvm/Kconfig1
-rw-r--r--arch/tile/kvm/Kconfig1
-rw-r--r--arch/x86/Kconfig1
-rw-r--r--arch/x86/kvm/Kconfig1
-rw-r--r--drivers/clk/Kconfig1
-rw-r--r--drivers/cpufreq/Kconfig1
-rw-r--r--drivers/devfreq/Kconfig1
-rw-r--r--drivers/md/Kconfig1
-rw-r--r--drivers/net/Kconfig1
-rw-r--r--fs/btrfs/Kconfig1
-rw-r--r--fs/notify/Kconfig1
-rw-r--r--fs/quota/Kconfig1
-rw-r--r--init/Kconfig9
-rw-r--r--kernel/notifier.c3
-rw-r--r--kernel/power/Kconfig1
-rw-r--r--kernel/rcu/Makefile3
-rw-r--r--lib/Kconfig.debug1
-rw-r--r--mm/Kconfig1
-rw-r--r--security/tomoyo/Kconfig1
23 files changed, 34 insertions, 1 deletions
diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
index 466bd299b1a8..3afee5f40f4f 100644
--- a/arch/arm/kvm/Kconfig
+++ b/arch/arm/kvm/Kconfig
@@ -23,6 +23,7 @@ config KVM
select HAVE_KVM_CPU_RELAX_INTERCEPT
select KVM_MMIO
select KVM_ARM_HOST
+ select SRCU
depends on ARM_VIRT_EXT && ARM_LPAE
---help---
Support hosting virtualized guest machines. You will also
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index 8ba85e9ea388..b334084d3675 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -26,6 +26,7 @@ config KVM
select KVM_ARM_HOST
select KVM_ARM_VGIC
select KVM_ARM_TIMER
+ select SRCU
---help---
Support hosting virtualized guest machines.
diff --git a/arch/mips/kvm/Kconfig b/arch/mips/kvm/Kconfig
index 30e334e823bd..2ae12825529f 100644
--- a/arch/mips/kvm/Kconfig
+++ b/arch/mips/kvm/Kconfig
@@ -20,6 +20,7 @@ config KVM
select PREEMPT_NOTIFIERS
select ANON_INODES
select KVM_MMIO
+ select SRCU
---help---
Support for hosting Guest kernels.
Currently supported on MIPS32 processors.
diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
index f5769f19ae25..11850f310fb4 100644
--- a/arch/powerpc/kvm/Kconfig
+++ b/arch/powerpc/kvm/Kconfig
@@ -21,6 +21,7 @@ config KVM
select PREEMPT_NOTIFIERS
select ANON_INODES
select HAVE_KVM_EVENTFD
+ select SRCU
config KVM_BOOK3S_HANDLER
bool
diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
index 646db9c467d1..5fce52cf0e57 100644
--- a/arch/s390/kvm/Kconfig
+++ b/arch/s390/kvm/Kconfig
@@ -28,6 +28,7 @@ config KVM
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQFD
select HAVE_KVM_IRQ_ROUTING
+ select SRCU
---help---
Support hosting paravirtualized guest machines using the SIE
virtualization capability on the mainframe. This should work
diff --git a/arch/tile/kvm/Kconfig b/arch/tile/kvm/Kconfig
index 2298cb1daff7..1e968f7550dc 100644
--- a/arch/tile/kvm/Kconfig
+++ b/arch/tile/kvm/Kconfig
@@ -21,6 +21,7 @@ config KVM
depends on HAVE_KVM && MODULES
select PREEMPT_NOTIFIERS
select ANON_INODES
+ select SRCU
---help---
Support hosting paravirtualized guest machines.
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ba397bde7948..661269953c1a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -138,6 +138,7 @@ config X86
select HAVE_ACPI_APEI_NMI if ACPI
select ACPI_LEGACY_TABLES_LOOKUP if ACPI
select X86_FEATURE_NAMES if PROC_FS
+ select SRCU
config INSTRUCTION_DECODER
def_bool y
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index f9d16ff56c6b..7dc7ba577ecd 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -40,6 +40,7 @@ config KVM
select HAVE_KVM_MSI
select HAVE_KVM_CPU_RELAX_INTERCEPT
select KVM_VFIO
+ select SRCU
---help---
Support hosting fully virtualized guest machines using hardware
virtualization extensions. You will need a fairly recent
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 3f44f292d066..91f86131bb7a 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -13,6 +13,7 @@ config COMMON_CLK
bool
select HAVE_CLK_PREPARE
select CLKDEV_LOOKUP
+ select SRCU
---help---
The common clock framework is a single definition of struct
clk, useful across many platforms, as well as an
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index 29b2ef5a68b9..a171fef2c2b6 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -2,6 +2,7 @@ menu "CPU Frequency scaling"
config CPU_FREQ
bool "CPU Frequency scaling"
+ select SRCU
help
CPU Frequency scaling allows you to change the clock speed of
CPUs on the fly. This is a nice method to save power, because
diff --git a/drivers/devfreq/Kconfig b/drivers/devfreq/Kconfig
index faf4e70c42e0..3891f6781298 100644
--- a/drivers/devfreq/Kconfig
+++ b/drivers/devfreq/Kconfig
@@ -1,5 +1,6 @@
menuconfig PM_DEVFREQ
bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"
+ select SRCU
help
A device may have a list of frequencies and voltages available.
devfreq, a generic DVFS framework can be registered for a device
diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 5bdedf6df153..c355a226a024 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -5,6 +5,7 @@
menuconfig MD
bool "Multiple devices driver support (RAID and LVM)"
depends on BLOCK
+ select SRCU
help
Support multiple physical spindles through a single logical device.
Required for RAID and logical volume management.
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index d6607ee9c855..84673ebcf428 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -197,6 +197,7 @@ config NETCONSOLE_DYNAMIC
config NETPOLL
def_bool NETCONSOLE
+ select SRCU
config NET_POLL_CONTROLLER
def_bool NETPOLL
diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
index a66768ebc8d1..80e9c18ea64f 100644
--- a/fs/btrfs/Kconfig
+++ b/fs/btrfs/Kconfig
@@ -8,6 +8,7 @@ config BTRFS_FS
select LZO_DECOMPRESS
select RAID6_PQ
select XOR_BLOCKS
+ select SRCU
help
Btrfs is a general purpose copy-on-write filesystem with extents,
diff --git a/fs/notify/Kconfig b/fs/notify/Kconfig
index 22c629eedd82..2a24249b30af 100644
--- a/fs/notify/Kconfig
+++ b/fs/notify/Kconfig
@@ -1,5 +1,6 @@
config FSNOTIFY
def_bool n
+ select SRCU
source "fs/notify/dnotify/Kconfig"
source "fs/notify/inotify/Kconfig"
diff --git a/fs/quota/Kconfig b/fs/quota/Kconfig
index c51df1dd237e..4a09975aac90 100644
--- a/fs/quota/Kconfig
+++ b/fs/quota/Kconfig
@@ -5,6 +5,7 @@
config QUOTA
bool "Quota support"
select QUOTACTL
+ select SRCU
help
If you say Y here, you will be able to set per user limits for disk
usage (also called disk quotas). Currently, it works for the
diff --git a/init/Kconfig b/init/Kconfig
index 9afb971497f4..f085969ba340 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -501,9 +501,17 @@ config TINY_RCU
endchoice
+config SRCU
+ bool
+ help
+ This option selects the sleepable version of RCU. This version
+ permits arbitrary sleeping or blocking within RCU read-side critical
+ sections.
+
config TASKS_RCU
bool "Task_based RCU implementation using voluntary context switch"
default n
+ select SRCU
help
This option enables a task-based RCU implementation that uses
only voluntary context switch (not preemption!), idle, and
@@ -1595,6 +1603,7 @@ config PERF_EVENTS
depends on HAVE_PERF_EVENTS
select ANON_INODES
select IRQ_WORK
+ select SRCU
help
Enable kernel support for various performance events provided
by software and hardware.
diff --git a/kernel/notifier.c b/kernel/notifier.c
index 4803da6eab62..ae9fc7cc360e 100644
--- a/kernel/notifier.c
+++ b/kernel/notifier.c
@@ -402,6 +402,7 @@ int raw_notifier_call_chain(struct raw_notifier_head *nh,
}
EXPORT_SYMBOL_GPL(raw_notifier_call_chain);
+#ifdef CONFIG_SRCU
/*
* SRCU notifier chain routines. Registration and unregistration
* use a mutex, and call_chain is synchronized by SRCU (no locks).
@@ -528,6 +529,8 @@ void srcu_init_notifier_head(struct srcu_notifier_head *nh)
}
EXPORT_SYMBOL_GPL(srcu_init_notifier_head);
+#endif /* CONFIG_SRCU */
+
static ATOMIC_NOTIFIER_HEAD(die_chain);
int notrace notify_die(enum die_val val, const char *str,
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 48b28d387c7f..7e01f78f0417 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -251,6 +251,7 @@ config APM_EMULATION
config PM_OPP
bool
+ select SRCU
---help---
SOCs have a standard set of tuples consisting of frequency and
voltage pairs that the device will support per voltage domain. This
diff --git a/kernel/rcu/Makefile b/kernel/rcu/Makefile
index e6fae503d1bc..50a808424b06 100644
--- a/kernel/rcu/Makefile
+++ b/kernel/rcu/Makefile
@@ -1,4 +1,5 @@
-obj-y += update.o srcu.o
+obj-y += update.o
+obj-$(CONFIG_SRCU) += srcu.o
obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
obj-$(CONFIG_TREE_RCU) += tree.o
obj-$(CONFIG_PREEMPT_RCU) += tree.o
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 5f2ce616c046..7a9c93e327f2 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1215,6 +1215,7 @@ config RCU_TORTURE_TEST
tristate "torture tests for RCU"
depends on DEBUG_KERNEL
select TORTURE_TEST
+ select SRCU
default n
help
This option provides a kernel module that runs torture tests
diff --git a/mm/Kconfig b/mm/Kconfig
index 1d1ae6b078fd..4395b12869c8 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -325,6 +325,7 @@ config VIRT_TO_BUS
config MMU_NOTIFIER
bool
+ select SRCU
config KSM
bool "Enable KSM for page merging"
diff --git a/security/tomoyo/Kconfig b/security/tomoyo/Kconfig
index 8eb779b9d77f..604e718d68d3 100644
--- a/security/tomoyo/Kconfig
+++ b/security/tomoyo/Kconfig
@@ -5,6 +5,7 @@ config SECURITY_TOMOYO
select SECURITYFS
select SECURITY_PATH
select SECURITY_NETWORK
+ select SRCU
default n
help
This selects TOMOYO Linux, pathname-based access control.