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>

2 files changed, 0 insertions, 9 deletions

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 589c6aca4803..2dd1f300a5cf 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -31,10 +31,6 @@ config ZONE_DMA
         bool
         default y
 
-config SEMAPHORE_SLEEPERS
-        bool
-        default y
-
 config GENERIC_FIND_NEXT_BIT
         bool
         default y
diff --git a/arch/blackfin/kernel/bfin_ksyms.c b/arch/blackfin/kernel/bfin_ksyms.c
index 0bfbb269e350..053edff6c0d8 100644
--- a/arch/blackfin/kernel/bfin_ksyms.c
+++ b/arch/blackfin/kernel/bfin_ksyms.c
@@ -42,11 +42,6 @@ EXPORT_SYMBOL(ip_fast_csum);
 
 EXPORT_SYMBOL(kernel_thread);
 
-EXPORT_SYMBOL(__up);
-EXPORT_SYMBOL(__down);
-EXPORT_SYMBOL(__down_trylock);
-EXPORT_SYMBOL(__down_interruptible);
-
 EXPORT_SYMBOL(is_in_rom);
 EXPORT_SYMBOL(bfin_return_from_exception);