summaryrefslogtreecommitdiffstats
path: root/arch/x86/um
diff options
context:
space:
mode:
authorWaiman Long <longman@redhat.com>2019-03-22 10:30:07 -0400
committerIngo Molnar <mingo@kernel.org>2019-04-03 14:50:52 +0200
commit390a0c62c23cb026cd4664a66f6f45fed3a215f6 (patch)
tree4c165e3312c28313f0e83bac3121c09559bd73fd /arch/x86/um
parent46ad0840b1584b92b5ff2cc3ed0b011dd6b8e0f1 (diff)
downloadlinux-390a0c62c23cb026cd4664a66f6f45fed3a215f6.tar.bz2
locking/rwsem: Remove rwsem-spinlock.c & use rwsem-xadd.c for all archs
Currently, we have two different implementation of rwsem: 1) CONFIG_RWSEM_GENERIC_SPINLOCK (rwsem-spinlock.c) 2) CONFIG_RWSEM_XCHGADD_ALGORITHM (rwsem-xadd.c) As we are going to use a single generic implementation for rwsem-xadd.c and no architecture-specific code will be needed, there is no point in keeping two different implementations of rwsem. In most cases, the performance of rwsem-spinlock.c will be worse. It also doesn't get all the performance tuning and optimizations that had been implemented in rwsem-xadd.c over the years. For simplication, we are going to remove rwsem-spinlock.c and make all architectures use a single implementation of rwsem - rwsem-xadd.c. All references to RWSEM_GENERIC_SPINLOCK and RWSEM_XCHGADD_ALGORITHM in the code are removed. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-c6x-dev@linux-c6x.org Cc: linux-m68k@lists.linux-m68k.org Cc: linux-riscv@lists.infradead.org Cc: linux-um@lists.infradead.org Cc: linux-xtensa@linux-xtensa.org Cc: linuxppc-dev@lists.ozlabs.org Cc: nios2-dev@lists.rocketboards.org Cc: openrisc@lists.librecores.org Cc: uclinux-h8-devel@lists.sourceforge.jp Link: https://lkml.kernel.org/r/20190322143008.21313-3-longman@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/um')
-rw-r--r--arch/x86/um/Kconfig6
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index a9e80e44178c..a8985e1f7432 100644
--- a/arch/x86/um/Kconfig
+++ b/arch/x86/um/Kconfig
@@ -32,12 +32,6 @@ config ARCH_DEFCONFIG
default "arch/um/configs/i386_defconfig" if X86_32
default "arch/um/configs/x86_64_defconfig" if X86_64
-config RWSEM_XCHGADD_ALGORITHM
- def_bool 64BIT
-
-config RWSEM_GENERIC_SPINLOCK
- def_bool !RWSEM_XCHGADD_ALGORITHM
-
config 3_LEVEL_PGTABLES
bool "Three-level pagetables" if !64BIT
default 64BIT