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>

7 files changed, 10 insertions, 3 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index fbdd8533c05d..4172c3cea228 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -11,6 +11,7 @@ config ARM
         select RTC_LIB
         select SYS_SUPPORTS_APM_EMULATION
         select GENERIC_ATOMIC64 if (CPU_V6 || !CPU_32v6K || !AEABI)
+        select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
         select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
         select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
         select HAVE_ARCH_KGDB
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index b3e10fdd3898..5e238d03960d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -20,6 +20,7 @@ config MIPS
         select ARCH_BINFMT_ELF_RANDOMIZE_PIE
         select RTC_LIB if !MACH_LOONGSON
         select GENERIC_ATOMIC64 if !64BIT
+        select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
         select HAVE_DMA_ATTRS
         select HAVE_DMA_API_DEBUG
         select HAVE_GENERIC_HARDIRQS
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 9a5d3cdc3e12..4f681b78dd8b 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -115,6 +115,7 @@ config PPC
         select HAVE_OPROFILE
         select HAVE_SYSCALL_WRAPPERS if PPC64
         select GENERIC_ATOMIC64 if PPC32
+        select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
         select HAVE_IRQ_WORK
         select HAVE_PERF_EVENTS
         select HAVE_REGS_AND_STACK_ACCESS_API
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index a39b4690c171..d0a5e92b6b9e 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -85,6 +85,7 @@ config S390
         select HAVE_ARCH_MUTEX_CPU_RELAX
         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
+        select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
         select HAVE_MEMBLOCK
         select HAVE_MEMBLOCK_NODE_MAP
         select HAVE_CMPXCHG_LOCAL
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c70684f859e1..ca4fdefe79e6 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -70,6 +70,7 @@ config X86
         select HAVE_ARCH_JUMP_LABEL
         select HAVE_TEXT_POKE_SMP
         select HAVE_GENERIC_HARDIRQS
+        select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
         select SPARSE_IRQ
         select GENERIC_FIND_FIRST_BIT
         select GENERIC_IRQ_PROBE
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);