[PATCH v8 6/6] MCS Lock: Allow architecture specific asm files tobe used for contended case

From: Tim Chen
Date: Mon Jan 20 2014 - 20:25:11 EST

From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>

This patch allows each architecture to add its specific assembly optimized
arch_mcs_spin_lock_contended and arch_mcs_spinlock_uncontended for
MCS lock and unlock functions.

Signed-off-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
---
arch/alpha/include/asm/Kbuild | 1 +
arch/arc/include/asm/Kbuild | 1 +
arch/arm/include/asm/Kbuild | 1 +
arch/arm64/include/asm/Kbuild | 1 +
arch/avr32/include/asm/Kbuild | 1 +
arch/blackfin/include/asm/Kbuild | 1 +
arch/c6x/include/asm/Kbuild | 1 +
arch/cris/include/asm/Kbuild | 1 +
arch/frv/include/asm/Kbuild | 1 +
arch/hexagon/include/asm/Kbuild | 1 +
arch/ia64/include/asm/Kbuild | 2 +-
arch/m32r/include/asm/Kbuild | 1 +
arch/m68k/include/asm/Kbuild | 1 +
arch/metag/include/asm/Kbuild | 1 +
arch/microblaze/include/asm/Kbuild | 1 +
arch/mips/include/asm/Kbuild | 1 +
arch/mn10300/include/asm/Kbuild | 1 +
arch/openrisc/include/asm/Kbuild | 1 +
arch/parisc/include/asm/Kbuild | 1 +
arch/powerpc/include/asm/Kbuild | 2 +-
arch/s390/include/asm/Kbuild | 1 +
arch/score/include/asm/Kbuild | 1 +
arch/sh/include/asm/Kbuild | 1 +
arch/sparc/include/asm/Kbuild | 1 +
arch/tile/include/asm/Kbuild | 1 +
arch/um/include/asm/Kbuild | 1 +
arch/unicore32/include/asm/Kbuild | 1 +
arch/x86/include/asm/Kbuild | 1 +
arch/xtensa/include/asm/Kbuild | 1 +
include/asm-generic/mcs_spinlock.h | 13 +++++++++++++
include/linux/mcs_spinlock.h | 2 ++
31 files changed, 44 insertions(+), 2 deletions(-)
create mode 100644 include/asm-generic/mcs_spinlock.h

diff --git a/arch/alpha/include/asm/Kbuild b/arch/alpha/include/asm/Kbuild
index f01fb50..14cbbbc 100644
--- a/arch/alpha/include/asm/Kbuild
+++ b/arch/alpha/include/asm/Kbuild
@@ -4,3 +4,4 @@ generic-y += clkdev.h
generic-y += exec.h
generic-y += trace_clock.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/arc/include/asm/Kbuild b/arch/arc/include/asm/Kbuild
index 9ae21c1..c0773a5 100644
--- a/arch/arc/include/asm/Kbuild
+++ b/arch/arc/include/asm/Kbuild
@@ -48,3 +48,4 @@ generic-y += user.h
generic-y += vga.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/arm/include/asm/Kbuild b/arch/arm/include/asm/Kbuild
index c38b58c..c68cfdd 100644
--- a/arch/arm/include/asm/Kbuild
+++ b/arch/arm/include/asm/Kbuild
@@ -34,3 +34,4 @@ generic-y += timex.h
generic-y += trace_clock.h
generic-y += unaligned.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
index 519f89f..24a3c10 100644
--- a/arch/arm64/include/asm/Kbuild
+++ b/arch/arm64/include/asm/Kbuild
@@ -51,3 +51,4 @@ generic-y += user.h
generic-y += vga.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/avr32/include/asm/Kbuild b/arch/avr32/include/asm/Kbuild
index 658001b..466e13d 100644
--- a/arch/avr32/include/asm/Kbuild
+++ b/arch/avr32/include/asm/Kbuild
@@ -18,3 +18,4 @@ generic-y += sections.h
generic-y += topology.h
generic-y += trace_clock.h
generic-y += xor.h
+generic-y += mcs_spinlock.h
diff --git a/arch/blackfin/include/asm/Kbuild b/arch/blackfin/include/asm/Kbuild
index f2b4347..0bd1c5c 100644
--- a/arch/blackfin/include/asm/Kbuild
+++ b/arch/blackfin/include/asm/Kbuild
@@ -45,3 +45,4 @@ generic-y += unaligned.h
generic-y += user.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/c6x/include/asm/Kbuild b/arch/c6x/include/asm/Kbuild
index fc0b3c3..21d7100 100644
--- a/arch/c6x/include/asm/Kbuild
+++ b/arch/c6x/include/asm/Kbuild
@@ -57,3 +57,4 @@ generic-y += user.h
generic-y += vga.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/cris/include/asm/Kbuild b/arch/cris/include/asm/Kbuild
index 199b1a9..c571cc1 100644
--- a/arch/cris/include/asm/Kbuild
+++ b/arch/cris/include/asm/Kbuild
@@ -13,3 +13,4 @@ generic-y += trace_clock.h
generic-y += vga.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/frv/include/asm/Kbuild b/arch/frv/include/asm/Kbuild
index 74742dc..ccca92e 100644
--- a/arch/frv/include/asm/Kbuild
+++ b/arch/frv/include/asm/Kbuild
@@ -3,3 +3,4 @@ generic-y += clkdev.h
generic-y += exec.h
generic-y += trace_clock.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/hexagon/include/asm/Kbuild b/arch/hexagon/include/asm/Kbuild
index ada843c..553077d 100644
--- a/arch/hexagon/include/asm/Kbuild
+++ b/arch/hexagon/include/asm/Kbuild
@@ -55,3 +55,4 @@ generic-y += ucontext.h
generic-y += unaligned.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/ia64/include/asm/Kbuild b/arch/ia64/include/asm/Kbuild
index f93ee08..25aed55 100644
--- a/arch/ia64/include/asm/Kbuild
+++ b/arch/ia64/include/asm/Kbuild
@@ -4,4 +4,4 @@ generic-y += exec.h
generic-y += kvm_para.h
generic-y += trace_clock.h
generic-y += preempt.h
-generic-y += vtime.h
\ No newline at end of file
+generic-y += vtime.hgeneric-y += mcs_spinlock.h
diff --git a/arch/m32r/include/asm/Kbuild b/arch/m32r/include/asm/Kbuild
index 2b58c5f..d64fdd1 100644
--- a/arch/m32r/include/asm/Kbuild
+++ b/arch/m32r/include/asm/Kbuild
@@ -4,3 +4,4 @@ generic-y += exec.h
generic-y += module.h
generic-y += trace_clock.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/m68k/include/asm/Kbuild b/arch/m68k/include/asm/Kbuild
index a5d27f2..1f4d44c 100644
--- a/arch/m68k/include/asm/Kbuild
+++ b/arch/m68k/include/asm/Kbuild
@@ -32,3 +32,4 @@ generic-y += types.h
generic-y += word-at-a-time.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/metag/include/asm/Kbuild b/arch/metag/include/asm/Kbuild
index 84d0c1d..ae0ae6e 100644
--- a/arch/metag/include/asm/Kbuild
+++ b/arch/metag/include/asm/Kbuild
@@ -53,3 +53,4 @@ generic-y += user.h
generic-y += vga.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/microblaze/include/asm/Kbuild b/arch/microblaze/include/asm/Kbuild
index a824265..6eb70bd 100644
--- a/arch/microblaze/include/asm/Kbuild
+++ b/arch/microblaze/include/asm/Kbuild
@@ -5,3 +5,4 @@ generic-y += exec.h
generic-y += trace_clock.h
generic-y += syscalls.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/mips/include/asm/Kbuild b/arch/mips/include/asm/Kbuild
index 1acbb8b..c718d63 100644
--- a/arch/mips/include/asm/Kbuild
+++ b/arch/mips/include/asm/Kbuild
@@ -14,3 +14,4 @@ generic-y += trace_clock.h
generic-y += preempt.h
generic-y += ucontext.h
generic-y += xor.h
+generic-y += mcs_spinlock.h
diff --git a/arch/mn10300/include/asm/Kbuild b/arch/mn10300/include/asm/Kbuild
index 032143e..1393ae5 100644
--- a/arch/mn10300/include/asm/Kbuild
+++ b/arch/mn10300/include/asm/Kbuild
@@ -4,3 +4,4 @@ generic-y += clkdev.h
generic-y += exec.h
generic-y += trace_clock.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/openrisc/include/asm/Kbuild b/arch/openrisc/include/asm/Kbuild
index da1951a..7e049d3 100644
--- a/arch/openrisc/include/asm/Kbuild
+++ b/arch/openrisc/include/asm/Kbuild
@@ -69,3 +69,4 @@ generic-y += vga.h
generic-y += word-at-a-time.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/parisc/include/asm/Kbuild b/arch/parisc/include/asm/Kbuild
index 34b0be4..ebe1649 100644
--- a/arch/parisc/include/asm/Kbuild
+++ b/arch/parisc/include/asm/Kbuild
@@ -6,3 +6,4 @@ generic-y += word-at-a-time.h auxvec.h user.h cputime.h emergency-restart.h \
poll.h xor.h clkdev.h exec.h
generic-y += trace_clock.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/powerpc/include/asm/Kbuild b/arch/powerpc/include/asm/Kbuild
index d8f9d2f..426001b 100644
--- a/arch/powerpc/include/asm/Kbuild
+++ b/arch/powerpc/include/asm/Kbuild
@@ -3,4 +3,4 @@ generic-y += clkdev.h
generic-y += rwsem.h
generic-y += trace_clock.h
generic-y += preempt.h
-generic-y += vtime.h
\ No newline at end of file
+generic-y += vtime.hgeneric-y += mcs_spinlock.h
diff --git a/arch/s390/include/asm/Kbuild b/arch/s390/include/asm/Kbuild
index 7a5288f..8508913 100644
--- a/arch/s390/include/asm/Kbuild
+++ b/arch/s390/include/asm/Kbuild
@@ -3,3 +3,4 @@
generic-y += clkdev.h
generic-y += trace_clock.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/score/include/asm/Kbuild b/arch/score/include/asm/Kbuild
index fe7471e..8e39afc 100644
--- a/arch/score/include/asm/Kbuild
+++ b/arch/score/include/asm/Kbuild
@@ -6,3 +6,4 @@ generic-y += clkdev.h
generic-y += trace_clock.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/sh/include/asm/Kbuild b/arch/sh/include/asm/Kbuild
index 231efbb..1aed131 100644
--- a/arch/sh/include/asm/Kbuild
+++ b/arch/sh/include/asm/Kbuild
@@ -35,3 +35,4 @@ generic-y += trace_clock.h
generic-y += ucontext.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/sparc/include/asm/Kbuild b/arch/sparc/include/asm/Kbuild
index bf39066..8843299 100644
--- a/arch/sparc/include/asm/Kbuild
+++ b/arch/sparc/include/asm/Kbuild
@@ -17,3 +17,4 @@ generic-y += trace_clock.h
generic-y += types.h
generic-y += word-at-a-time.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/tile/include/asm/Kbuild b/arch/tile/include/asm/Kbuild
index 22f3bd1..152fc48 100644
--- a/arch/tile/include/asm/Kbuild
+++ b/arch/tile/include/asm/Kbuild
@@ -39,3 +39,4 @@ generic-y += trace_clock.h
generic-y += types.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild
index fdde187..620d729 100644
--- a/arch/um/include/asm/Kbuild
+++ b/arch/um/include/asm/Kbuild
@@ -4,3 +4,4 @@ generic-y += ftrace.h pci.h io.h param.h delay.h mutex.h current.h exec.h
generic-y += switch_to.h clkdev.h
generic-y += trace_clock.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/unicore32/include/asm/Kbuild b/arch/unicore32/include/asm/Kbuild
index 00045cb..cd7822c 100644
--- a/arch/unicore32/include/asm/Kbuild
+++ b/arch/unicore32/include/asm/Kbuild
@@ -61,3 +61,4 @@ generic-y += user.h
generic-y += vga.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/arch/x86/include/asm/Kbuild b/arch/x86/include/asm/Kbuild
index 7f66985..a8fee07 100644
--- a/arch/x86/include/asm/Kbuild
+++ b/arch/x86/include/asm/Kbuild
@@ -5,3 +5,4 @@ genhdr-y += unistd_64.h
genhdr-y += unistd_x32.h

generic-y += clkdev.h
+generic-y += mcs_spinlock.h
diff --git a/arch/xtensa/include/asm/Kbuild b/arch/xtensa/include/asm/Kbuild
index 228d6ae..9653e5c 100644
--- a/arch/xtensa/include/asm/Kbuild
+++ b/arch/xtensa/include/asm/Kbuild
@@ -29,3 +29,4 @@ generic-y += topology.h
generic-y += trace_clock.h
generic-y += xor.h
generic-y += preempt.h
+generic-y += mcs_spinlock.h
diff --git a/include/asm-generic/mcs_spinlock.h b/include/asm-generic/mcs_spinlock.h
new file mode 100644
index 0000000..10cd4ff
--- /dev/null
+++ b/include/asm-generic/mcs_spinlock.h
@@ -0,0 +1,13 @@
+#ifndef __ASM_MCS_SPINLOCK_H
+#define __ASM_MCS_SPINLOCK_H
+
+/*
+ * Architectures can define their own:
+ *
+ * arch_mcs_spin_lock_contended(l)
+ * arch_mcs_spin_unlock_contended(l)
+ *
+ * See kernel/locking/mcs_spinlock.c.
+ */
+
+#endif /* __ASM_MCS_SPINLOCK_H */
diff --git a/include/linux/mcs_spinlock.h b/include/linux/mcs_spinlock.h
index d54bb23..164298a 100644
--- a/include/linux/mcs_spinlock.h
+++ b/include/linux/mcs_spinlock.h
@@ -12,6 +12,8 @@
#ifndef __LINUX_MCS_SPINLOCK_H
#define __LINUX_MCS_SPINLOCK_H

+#include <asm/mcs_spinlock.h>
+
struct mcs_spinlock {
struct mcs_spinlock *next;
int locked; /* 1 if lock acquired */
--
1.7.11.7


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