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authorMatthew Wilcox <matthew@wil.cx>2008-03-07 21:55:58 -0500
committerMatthew Wilcox <willy@linux.intel.com>2008-04-17 10:42:34 -0400
commit64ac24e738823161693bf791f87adc802cf529ff (patch)
tree19c0b0cf314d4394ca580c05b86cdf874ce0a167 /arch/um
parentAdd semaphore.h to kernel_lock.c (diff)
downloadlinux-dev-64ac24e738823161693bf791f87adc802cf529ff.tar.xz
linux-dev-64ac24e738823161693bf791f87adc802cf529ff.zip
Generic semaphore implementation
Semaphores are no longer performance-critical, so a generic C implementation is better for maintainability, debuggability and extensibility. Thanks to Peter Zijlstra for fixing the lockdep warning. Thanks to Harvey Harrison for pointing out that the unlikely() was unnecessary. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Acked-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to '')
-rw-r--r--arch/um/Kconfig.i3864
-rw-r--r--arch/um/Kconfig.x86_644
-rw-r--r--arch/um/sys-i386/ksyms.c12
-rw-r--r--arch/um/sys-ppc/Makefile8
-rw-r--r--arch/um/sys-x86_64/ksyms.c13
5 files changed, 3 insertions, 38 deletions
diff --git a/arch/um/Kconfig.i386 b/arch/um/Kconfig.i386
index 3cd8a04d66d8..e09edfa560da 100644
--- a/arch/um/Kconfig.i386
+++ b/arch/um/Kconfig.i386
@@ -19,10 +19,6 @@ config 64BIT
bool
default n
-config SEMAPHORE_SLEEPERS
- bool
- default y
-
config 3_LEVEL_PGTABLES
bool "Three-level pagetables (EXPERIMENTAL)"
default n
diff --git a/arch/um/Kconfig.x86_64 b/arch/um/Kconfig.x86_64
index 6533b349f061..3fbe69e359ed 100644
--- a/arch/um/Kconfig.x86_64
+++ b/arch/um/Kconfig.x86_64
@@ -11,10 +11,6 @@ config RWSEM_GENERIC_SPINLOCK
bool
default y
-config SEMAPHORE_SLEEPERS
- bool
- default y
-
config 3_LEVEL_PGTABLES
bool
default y
diff --git a/arch/um/sys-i386/ksyms.c b/arch/um/sys-i386/ksyms.c
index 2a1eac1859ce..bfbefd30db8f 100644
--- a/arch/um/sys-i386/ksyms.c
+++ b/arch/um/sys-i386/ksyms.c
@@ -1,17 +1,5 @@
#include "linux/module.h"
-#include "linux/in6.h"
-#include "linux/rwsem.h"
-#include "asm/byteorder.h"
-#include "asm/delay.h"
-#include "asm/semaphore.h"
-#include "asm/uaccess.h"
#include "asm/checksum.h"
-#include "asm/errno.h"
-
-EXPORT_SYMBOL(__down_failed);
-EXPORT_SYMBOL(__down_failed_interruptible);
-EXPORT_SYMBOL(__down_failed_trylock);
-EXPORT_SYMBOL(__up_wakeup);
/* Networking helper routines. */
EXPORT_SYMBOL(csum_partial);
diff --git a/arch/um/sys-ppc/Makefile b/arch/um/sys-ppc/Makefile
index 08901526e893..b8bc844fd2c4 100644
--- a/arch/um/sys-ppc/Makefile
+++ b/arch/um/sys-ppc/Makefile
@@ -3,7 +3,7 @@ OBJ = built-in.o
.S.o:
$(CC) $(KBUILD_AFLAGS) -D__ASSEMBLY__ -D__UM_PPC__ -c $< -o $*.o
-OBJS = ptrace.o sigcontext.o semaphore.o checksum.o miscthings.o misc.o \
+OBJS = ptrace.o sigcontext.o checksum.o miscthings.o misc.o \
ptrace_user.o sysrq.o
EXTRA_AFLAGS := -DCONFIG_PPC32 -I. -I$(srctree)/arch/ppc/kernel
@@ -20,10 +20,6 @@ ptrace_user.o: ptrace_user.c
sigcontext.o: sigcontext.c
$(CC) $(USER_CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
-semaphore.c:
- rm -f $@
- ln -s $(srctree)/arch/ppc/kernel/$@ $@
-
checksum.S:
rm -f $@
ln -s $(srctree)/arch/ppc/lib/$@ $@
@@ -66,4 +62,4 @@ misc.o: misc.S ppc_defs.h
$(CC) $(EXTRA_AFLAGS) $(KBUILD_AFLAGS) -D__ASSEMBLY__ -D__UM_PPC__ -c $< -o $*.o
rm -f asm
-clean-files := $(OBJS) ppc_defs.h checksum.S semaphore.c mk_defs.c
+clean-files := $(OBJS) ppc_defs.h checksum.S mk_defs.c
diff --git a/arch/um/sys-x86_64/ksyms.c b/arch/um/sys-x86_64/ksyms.c
index 12c593607c59..4d7d1a812d8f 100644
--- a/arch/um/sys-x86_64/ksyms.c
+++ b/arch/um/sys-x86_64/ksyms.c
@@ -1,16 +1,5 @@
#include "linux/module.h"
-#include "linux/in6.h"
-#include "linux/rwsem.h"
-#include "asm/byteorder.h"
-#include "asm/semaphore.h"
-#include "asm/uaccess.h"
-#include "asm/checksum.h"
-#include "asm/errno.h"
-
-EXPORT_SYMBOL(__down_failed);
-EXPORT_SYMBOL(__down_failed_interruptible);
-EXPORT_SYMBOL(__down_failed_trylock);
-EXPORT_SYMBOL(__up_wakeup);
+#include "asm/string.h"
/*XXX: we need them because they would be exported by x86_64 */
EXPORT_SYMBOL(__memcpy);