From 22b361d1df7bc25b558e52f22e779286a3d323e4 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Mon, 17 Dec 2012 16:01:39 -0800 Subject: [PATCH] percpu_rw_semaphore: introduce CONFIG_PERCPU_RWSEM Currently only block_dev and uprobes use percpu_rw_semaphore, add the config option selected by BLOCK || UPROBES. Signed-off-by: Oleg Nesterov Cc: Anton Arapov Cc: Ingo Molnar Cc: Linus Torvalds Cc: Michal Marek Cc: Mikulas Patocka Cc: "Paul E. McKenney" Cc: Peter Zijlstra Cc: Srikar Dronamraju Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/Kconfig | 1 + block/Kconfig | 1 + lib/Kconfig | 3 +++ lib/Makefile | 3 ++- 4 files changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/Kconfig b/arch/Kconfig index 34884faf98c..54ffd0f9df2 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -80,6 +80,7 @@ config UPROBES bool "Transparent user-space probes (EXPERIMENTAL)" depends on UPROBE_EVENT && PERF_EVENTS default n + select PERCPU_RWSEM help Uprobes is the user-space counterpart to kprobes: they enable instrumentation applications (such as 'perf probe') diff --git a/block/Kconfig b/block/Kconfig index a7e40a7c821..4a85ccf8d4c 100644 --- a/block/Kconfig +++ b/block/Kconfig @@ -4,6 +4,7 @@ menuconfig BLOCK bool "Enable the block layer" if EXPERT default y + select PERCPU_RWSEM help Provide block layer support for the kernel. diff --git a/lib/Kconfig b/lib/Kconfig index 4b31a46fb30..75cdb77fa49 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -42,6 +42,9 @@ config GENERIC_IO config STMP_DEVICE bool +config PERCPU_RWSEM + boolean + config CRC_CCITT tristate "CRC-CCITT functions" help diff --git a/lib/Makefile b/lib/Makefile index e959c20efb2..5558e35170c 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -9,7 +9,7 @@ endif lib-y := ctype.o string.o vsprintf.o cmdline.o \ rbtree.o radix-tree.o dump_stack.o timerqueue.o\ - idr.o int_sqrt.o extable.o percpu-rwsem.o \ + idr.o int_sqrt.o extable.o \ sha1.o md5.o irq_regs.o reciprocal_div.o argv_split.o \ proportions.o flex_proportions.o prio_heap.o ratelimit.o show_mem.o \ is_single_threaded.o plist.o decompress.o kobject_uevent.o \ @@ -40,6 +40,7 @@ obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o +lib-$(CONFIG_PERCPU_RWSEM) += percpu-rwsem.o CFLAGS_hweight.o = $(subst $(quote),,$(CONFIG_ARCH_HWEIGHT_CFLAGS)) obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o