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Date: Thu, 4 Dec 2014 18:50:24 -0500 From: Pranith Kumar <bobby.prani@...il.com> To: linux-kernel@...r.kernel.org Cc: Paul McKenney <paulmck@...ux.vnet.ibm.com>, Josh Triplett <josh@...htriplett.org> Subject: [PATCH] tinification: 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@...il.com> CC: Paul McKenney <paulmck@...ux.vnet.ibm.com> CC: Josh Triplett <josh@...htriplett.org> --- arch/arm/kvm/Kconfig | 1 + arch/arm64/kvm/Kconfig | 1 + arch/ia64/kvm/Kconfig | 1 + arch/mips/kvm/Kconfig | 1 + arch/powerpc/kvm/Kconfig | 1 + arch/s390/kvm/Kconfig | 1 + arch/tile/kvm/Kconfig | 1 + arch/x86/Kconfig | 1 + arch/x86/kvm/Kconfig | 1 + drivers/clk/Kconfig | 1 + drivers/cpufreq/Kconfig | 1 + drivers/devfreq/Kconfig | 1 + drivers/md/Kconfig | 1 + drivers/net/Kconfig | 1 + fs/btrfs/Kconfig | 1 + fs/notify/Kconfig | 1 + init/Kconfig | 10 ++++++++++ kernel/notifier.c | 3 +++ kernel/rcu/Makefile | 3 ++- lib/Kconfig.debug | 1 + mm/Kconfig | 1 + security/tomoyo/Kconfig | 1 + 22 files changed, 34 insertions(+), 1 deletion(-) diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig index 466bd29..3afee5f 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 8ba85e9..b334084 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/ia64/kvm/Kconfig b/arch/ia64/kvm/Kconfig index 3d50ea9..f7d380b 100644 --- a/arch/ia64/kvm/Kconfig +++ b/arch/ia64/kvm/Kconfig @@ -29,6 +29,7 @@ config KVM select HAVE_KVM_IRQ_ROUTING select KVM_APIC_ARCHITECTURE select KVM_MMIO + select SRCU ---help--- Support hosting fully virtualized guest machines using hardware virtualization extensions. You will need a fairly recent diff --git a/arch/mips/kvm/Kconfig b/arch/mips/kvm/Kconfig index 30e334e..2ae1282 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 602eb51..af18e0f 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 646db9c..5fce52c 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 2298cb1..1e968f7 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 ded8a67..1c581a0 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -137,6 +137,7 @@ 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 f9d16ff..7dc7ba5 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 455fd17..53e64f1 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 3489f8f..ebaa0cc 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 faf4e70..3891f67 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 5bdedf6..c355a22 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 f9009be..1c7efb1 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -177,6 +177,7 @@ 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 a66768e..80e9c18 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 22c629e..2a24249 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/init/Kconfig b/init/Kconfig index 903505e..100f4e7 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -501,9 +501,18 @@ config TINY_RCU endchoice +config SRCU + bool "Sleepable form of RCU" + def_bool n + 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 @@ -1593,6 +1602,7 @@ 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 4803da6..ae9fc7c 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/rcu/Makefile b/kernel/rcu/Makefile index e6fae50..50a8084 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 d780351..ce76f34 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1199,6 +1199,7 @@ 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 1d1ae6b..4395b12 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 8eb779b9d..604e718 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. -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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