[LIB]: Consolidate _atomic_dec_and_lock()

Several implementations were essentialy a common piece of C code using
the cmpxchg() macro.  Put the implementation in one spot that everyone
can share, and convert sparc64 over to using this.

Alpha is the lone arch-specific implementation, which codes up a
special fast path for the common case in order to avoid GP reloading
which a pure C version would require.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 0 insertions, 5 deletions

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index b22f003eaa6d..d2703cda61ea 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -908,11 +908,6 @@ config IRQBALANCE
           The default yes will allow the kernel to do irq load balancing.
           Saying no will keep the kernel from doing irq load balancing.
 
-config HAVE_DEC_LOCK
-        bool
-        depends on (SMP || PREEMPT) && X86_CMPXCHG
-        default y
-
 # turning this on wastes a bunch of space.
 # Summit needs it only when NUMA is on
 config BOOT_IOREMAP