[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/x86_64/Kconfig b/arch/x86_64/Kconfig
index e63323e03ea9..0969d570f3b5 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -277,11 +277,6 @@ source "mm/Kconfig"
 config HAVE_ARCH_EARLY_PFN_TO_NID
         def_bool y
 
-config HAVE_DEC_LOCK
-        bool
-        depends on SMP
-        default y
-
 config NR_CPUS
         int "Maximum number of CPUs (2-256)"
         range 2 256