atomic64_test: simplify the #ifdef for atomic64_dec_if_positive() test

Introduce CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE and use this instead
of the multitude of #if defined() checks in atomic64_test.c

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 5 insertions, 3 deletions

diff --git a/lib/Kconfig b/lib/Kconfig
index 8269d56dcdaa..72c1d4693068 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -340,6 +340,9 @@ config NLATTR
 config GENERIC_ATOMIC64
        bool
 
+config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
+        def_bool y if GENERIC_ATOMIC64
+
 config LRU_CACHE
         tristate
 
diff --git a/lib/atomic64_test.c b/lib/atomic64_test.c
index cb99b91c3a1d..00bca223d1e1 100644
--- a/lib/atomic64_test.c
+++ b/lib/atomic64_test.c
@@ -114,8 +114,7 @@ static __init int test_atomic64(void)
         r += one;
         BUG_ON(v.counter != r);
 
-#if defined(CONFIG_X86) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || \
-    defined(CONFIG_S390) || defined(_ASM_GENERIC_ATOMIC64_H) || defined(CONFIG_ARM)
+#ifdef CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
         INIT(onestwos);
         BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
         r -= one;
@@ -129,7 +128,7 @@ static __init int test_atomic64(void)
         BUG_ON(atomic64_dec_if_positive(&v) != (-one - one));
         BUG_ON(v.counter != r);
 #else
-#warning Please implement atomic64_dec_if_positive for your architecture, and add it to the IF above
+#warning Please implement atomic64_dec_if_positive for your architecture and select the above Kconfig symbol
 #endif
 
         INIT(onestwos);