[dpdk-stable] [PATCH v4 1/4] eal: fix clang compilation error on x86

[gavin hu <gavin.hu@arm.com>]

From: Gavin Hu <gavin.hu@arm.com>

When CONFIG_RTE_FORCE_INTRINSICS is enabled for x86, the clang
compilation error was:
	include/generic/rte_atomic.h:215:9: error:
		implicit declaration of function '__atomic_exchange_2'
		is invalid in C99
	include/generic/rte_atomic.h:494:9: error:
		implicit declaration of function '__atomic_exchange_4'
		is invalid in C99
	include/generic/rte_atomic.h:772:9: error:
		implicit declaration of function '__atomic_exchange_8'
		is invalid in C99

Use __atomic_exchange_n instead of __atomic_exchange_(2/4/8).
For more information, please refer to:
http://mails.dpdk.org/archives/dev/2018-April/096776.html

Fixes: 7bdccb93078e ("eal: fix ARM build with clang")
Cc: stable@dpdk.org

Signed-off-by: Gavin Hu <gavin.hu@arm.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>
---
 lib/librte_eal/common/include/generic/rte_atomic.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/librte_eal/common/include/generic/rte_atomic.h b/lib/librte_eal/common/include/generic/rte_atomic.h
index b99ba46..ed5b125 100644
--- a/lib/librte_eal/common/include/generic/rte_atomic.h
+++ b/lib/librte_eal/common/include/generic/rte_atomic.h
@@ -212,7 +212,7 @@ rte_atomic16_exchange(volatile uint16_t *dst, uint16_t val);
 static inline uint16_t
 rte_atomic16_exchange(volatile uint16_t *dst, uint16_t val)
 {
-#if defined(RTE_ARCH_ARM64) && defined(RTE_TOOLCHAIN_CLANG)
+#if defined(RTE_TOOLCHAIN_CLANG)
 	return __atomic_exchange_n(dst, val, __ATOMIC_SEQ_CST);
 #else
 	return __atomic_exchange_2(dst, val, __ATOMIC_SEQ_CST);
@@ -495,7 +495,7 @@ rte_atomic32_exchange(volatile uint32_t *dst, uint32_t val);
 static inline uint32_t
 rte_atomic32_exchange(volatile uint32_t *dst, uint32_t val)
 {
-#if defined(RTE_ARCH_ARM64) && defined(RTE_TOOLCHAIN_CLANG)
+#if defined(RTE_TOOLCHAIN_CLANG)
 	return __atomic_exchange_n(dst, val, __ATOMIC_SEQ_CST);
 #else
 	return __atomic_exchange_4(dst, val, __ATOMIC_SEQ_CST);
@@ -777,7 +777,7 @@ rte_atomic64_exchange(volatile uint64_t *dst, uint64_t val);
 static inline uint64_t
 rte_atomic64_exchange(volatile uint64_t *dst, uint64_t val)
 {
-#if defined(RTE_ARCH_ARM64) && defined(RTE_TOOLCHAIN_CLANG)
+#if defined(RTE_TOOLCHAIN_CLANG)
 	return __atomic_exchange_n(dst, val, __ATOMIC_SEQ_CST);
 #else
 	return __atomic_exchange_8(dst, val, __ATOMIC_SEQ_CST);
-- 
2.7.4