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authorWaiman Long <longman@redhat.com>2019-03-22 17:30:07 +0300
committerIngo Molnar <mingo@kernel.org>2019-04-03 15:50:52 +0300
commit390a0c62c23cb026cd4664a66f6f45fed3a215f6 (patch)
tree4c165e3312c28313f0e83bac3121c09559bd73fd /arch
parent46ad0840b1584b92b5ff2cc3ed0b011dd6b8e0f1 (diff)
downloadlinux-390a0c62c23cb026cd4664a66f6f45fed3a215f6.tar.xz
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')
-rw-r--r--arch/alpha/Kconfig7
-rw-r--r--arch/arc/Kconfig3
-rw-r--r--arch/arm/Kconfig4
-rw-r--r--arch/arm64/Kconfig3
-rw-r--r--arch/c6x/Kconfig3
-rw-r--r--arch/csky/Kconfig3
-rw-r--r--arch/h8300/Kconfig3
-rw-r--r--arch/hexagon/Kconfig6
-rw-r--r--arch/ia64/Kconfig4
-rw-r--r--arch/m68k/Kconfig7
-rw-r--r--arch/microblaze/Kconfig6
-rw-r--r--arch/mips/Kconfig7
-rw-r--r--arch/nds32/Kconfig3
-rw-r--r--arch/nios2/Kconfig3
-rw-r--r--arch/openrisc/Kconfig6
-rw-r--r--arch/parisc/Kconfig6
-rw-r--r--arch/powerpc/Kconfig7
-rw-r--r--arch/riscv/Kconfig3
-rw-r--r--arch/s390/Kconfig6
-rw-r--r--arch/sh/Kconfig6
-rw-r--r--arch/sparc/Kconfig8
-rw-r--r--arch/unicore32/Kconfig6
-rw-r--r--arch/x86/Kconfig3
-rw-r--r--arch/x86/um/Kconfig6
-rw-r--r--arch/xtensa/Kconfig3
25 files changed, 0 insertions, 122 deletions
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 584a6e114853..27c871227eee 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -49,13 +49,6 @@ config MMU
bool
default y
-config RWSEM_GENERIC_SPINLOCK
- bool
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
- default y
-
config ARCH_HAS_ILOG2_U32
bool
default n
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index c781e45d1d99..23e063df5d2c 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -63,9 +63,6 @@ config SCHED_OMIT_FRAME_POINTER
config GENERIC_CSUM
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config ARCH_DISCONTIGMEM_ENABLE
def_bool n
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 850b4805e2d1..c8b03e1c6c2a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -178,10 +178,6 @@ config TRACE_IRQFLAGS_SUPPORT
bool
default !CPU_V7M
-config RWSEM_XCHGADD_ALGORITHM
- bool
- default y
-
config ARCH_HAS_ILOG2_U32
bool
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7e34b9eba5de..c62b9db2b5e8 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -237,9 +237,6 @@ config LOCKDEP_SUPPORT
config TRACE_IRQFLAGS_SUPPORT
def_bool y
-config RWSEM_XCHGADD_ALGORITHM
- def_bool y
-
config GENERIC_BUG
def_bool y
depends on BUG
diff --git a/arch/c6x/Kconfig b/arch/c6x/Kconfig
index e5cd3c5f8399..ed92b5840c0a 100644
--- a/arch/c6x/Kconfig
+++ b/arch/c6x/Kconfig
@@ -27,9 +27,6 @@ config MMU
config FPU
def_bool n
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config GENERIC_CALIBRATE_DELAY
def_bool y
diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 725a115759c9..6555d1781132 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -92,9 +92,6 @@ config GENERIC_HWEIGHT
config MMU
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config STACKTRACE_SUPPORT
def_bool y
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index c071da34e081..61c01db6c292 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -27,9 +27,6 @@ config H8300
config CPU_BIG_ENDIAN
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config GENERIC_HWEIGHT
def_bool y
diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index ac441680dcc0..3e54a53208d5 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -65,12 +65,6 @@ config GENERIC_CSUM
config GENERIC_IRQ_PROBE
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool n
-
-config RWSEM_XCHGADD_ALGORITHM
- def_bool y
-
config GENERIC_HWEIGHT
def_bool y
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 8d7396bd1790..73a26f04644e 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -83,10 +83,6 @@ config STACKTRACE_SUPPORT
config GENERIC_LOCKBREAK
def_bool n
-config RWSEM_XCHGADD_ALGORITHM
- bool
- default y
-
config HUGETLB_PAGE_SIZE_VARIABLE
bool
depends on HUGETLB_PAGE
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index b54206408f91..f5661f48019c 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -32,13 +32,6 @@ config M68K
config CPU_BIG_ENDIAN
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- bool
- default y
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
-
config ARCH_HAS_ILOG2_U32
bool
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index a51b965b3b82..a7a9a9d59f65 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -58,15 +58,9 @@ config CPU_LITTLE_ENDIAN
endchoice
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config ZONE_DMA
def_bool y
-config RWSEM_XCHGADD_ALGORITHM
- bool
-
config ARCH_HAS_ILOG2_U32
def_bool n
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 4a5f5b0ee9a9..b9c48b27162d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1037,13 +1037,6 @@ source "arch/mips/paravirt/Kconfig"
endmenu
-config RWSEM_GENERIC_SPINLOCK
- bool
- default y
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
-
config GENERIC_HWEIGHT
bool
default y
diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig
index addb7f5f5264..55559ca0efe4 100644
--- a/arch/nds32/Kconfig
+++ b/arch/nds32/Kconfig
@@ -60,9 +60,6 @@ config GENERIC_LOCKBREAK
def_bool y
depends on PREEMPT
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config TRACE_IRQFLAGS_SUPPORT
def_bool y
diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index 4ef15a61b7bc..56685fd45ed0 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -40,9 +40,6 @@ config NO_IOPORT_MAP
config FPU
def_bool n
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config TRACE_IRQFLAGS_SUPPORT
def_bool n
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index a5e361fbb75a..683511b8c9df 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -43,12 +43,6 @@ config CPU_BIG_ENDIAN
config MMU
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
-config RWSEM_XCHGADD_ALGORITHM
- def_bool n
-
config GENERIC_HWEIGHT
def_bool y
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index c8e621296092..f1ed8ddfe486 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -75,12 +75,6 @@ config GENERIC_LOCKBREAK
default y
depends on SMP && PREEMPT
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
-
config ARCH_HAS_ILOG2_U32
bool
default n
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 2d0be82c3061..e5dd6aafaf68 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -103,13 +103,6 @@ config LOCKDEP_SUPPORT
bool
default y
-config RWSEM_GENERIC_SPINLOCK
- bool
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
- default y
-
config GENERIC_LOCKBREAK
bool
default y
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index eb56c82d8aa1..0582260fb6c2 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -69,9 +69,6 @@ config STACKTRACE_SUPPORT
config TRACE_IRQFLAGS_SUPPORT
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
config GENERIC_BUG
def_bool y
depends on BUG
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index b6e3d0653002..c9300b437195 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -14,12 +14,6 @@ config LOCKDEP_SUPPORT
config STACKTRACE_SUPPORT
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- bool
-
-config RWSEM_XCHGADD_ALGORITHM
- def_bool y
-
config ARCH_HAS_ILOG2_U32
def_bool n
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index b1c91ea9a958..0be08d586d40 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -90,12 +90,6 @@ config ARCH_DEFCONFIG
default "arch/sh/configs/shx3_defconfig" if SUPERH32
default "arch/sh/configs/cayman_defconfig" if SUPERH64
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
-
config GENERIC_BUG
def_bool y
depends on BUG && SUPERH32
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 40f8f4f73fe8..16b620237816 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -191,14 +191,6 @@ config NR_CPUS
source "kernel/Kconfig.hz"
-config RWSEM_GENERIC_SPINLOCK
- bool
- default y if SPARC32
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
- default y if SPARC64
-
config GENERIC_HWEIGHT
bool
default y
diff --git a/arch/unicore32/Kconfig b/arch/unicore32/Kconfig
index 817d82608712..0d5869c9bf03 100644
--- a/arch/unicore32/Kconfig
+++ b/arch/unicore32/Kconfig
@@ -38,12 +38,6 @@ config STACKTRACE_SUPPORT
config LOCKDEP_SUPPORT
def_bool y
-config RWSEM_GENERIC_SPINLOCK
- def_bool y
-
-config RWSEM_XCHGADD_ALGORITHM
- bool
-
config ARCH_HAS_ILOG2_U32
bool
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5ad92419be19..84b184e016cd 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -268,9 +268,6 @@ config ARCH_MAY_HAVE_PC_FDC
def_bool y
depends on ISA_DMA_API
-config RWSEM_XCHGADD_ALGORITHM
- def_bool y
-
config GENERIC_CALIBRATE_DELAY
def_bool y
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
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 4b9aafe766c5..35c8d91e6106 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -46,9 +46,6 @@ config XTENSA
with reasonable minimum requirements. The Xtensa Linux project has
a home page at <http://www.linux-xtensa.org/>.
-config RWSEM_XCHGADD_ALGORITHM
- def_bool y
-
config GENERIC_HWEIGHT
def_bool y