[dpdk-dev] [PATCH 1/6] eal: add const in prefetch functions

[Pablo de Lara]

rte_prefetchX functions included volatile void *p as parameter,
but the function does not modify it, so it should include the const keyword.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch at intel.com>
---
 lib/librte_eal/common/include/arch/ppc_64/rte_prefetch.h |  6 +++---
 lib/librte_eal/common/include/arch/x86/rte_prefetch.h    | 12 ++++++------
 lib/librte_eal/common/include/generic/rte_prefetch.h     |  6 +++---
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/lib/librte_eal/common/include/arch/ppc_64/rte_prefetch.h b/lib/librte_eal/common/include/arch/ppc_64/rte_prefetch.h
index 9df0d13..fea3be1 100644
--- a/lib/librte_eal/common/include/arch/ppc_64/rte_prefetch.h
+++ b/lib/librte_eal/common/include/arch/ppc_64/rte_prefetch.h
@@ -39,17 +39,17 @@ extern "C" {
 
 #include "generic/rte_prefetch.h"
 
-static inline void rte_prefetch0(volatile void *p)
+static inline void rte_prefetch0(const volatile void *p)
 {
 	asm volatile ("dcbt 0,%[p],1" : : [p] "r" (p));
 }
 
-static inline void rte_prefetch1(volatile void *p)
+static inline void rte_prefetch1(const volatile void *p)
 {
 	asm volatile ("dcbt 0,%[p],1" : : [p] "r" (p));
 }
 
-static inline void rte_prefetch2(volatile void *p)
+static inline void rte_prefetch2(const volatile void *p)
 {
 	asm volatile ("dcbt 0,%[p],1" : : [p] "r" (p));
 }
diff --git a/lib/librte_eal/common/include/arch/x86/rte_prefetch.h b/lib/librte_eal/common/include/arch/x86/rte_prefetch.h
index ec2454d..688fa5e 100644
--- a/lib/librte_eal/common/include/arch/x86/rte_prefetch.h
+++ b/lib/librte_eal/common/include/arch/x86/rte_prefetch.h
@@ -40,19 +40,19 @@ extern "C" {
 
 #include "generic/rte_prefetch.h"
 
-static inline void rte_prefetch0(volatile void *p)
+static inline void rte_prefetch0(const volatile void *p)
 {
-	asm volatile ("prefetcht0 %[p]" : [p] "+m" (*(volatile char *)p));
+	asm volatile ("prefetcht0 %[p]" : : [p] "m" (*(const volatile char *)p));
 }
 
-static inline void rte_prefetch1(volatile void *p)
+static inline void rte_prefetch1(const volatile void *p)
 {
-	asm volatile ("prefetcht1 %[p]" : [p] "+m" (*(volatile char *)p));
+	asm volatile ("prefetcht1 %[p]" : : [p] "m" (*(const volatile char *)p));
 }
 
-static inline void rte_prefetch2(volatile void *p)
+static inline void rte_prefetch2(const volatile void *p)
 {
-	asm volatile ("prefetcht2 %[p]" : [p] "+m" (*(volatile char *)p));
+	asm volatile ("prefetcht2 %[p]" : : [p] "m" (*(const volatile char *)p));
 }
 
 #ifdef __cplusplus
diff --git a/lib/librte_eal/common/include/generic/rte_prefetch.h b/lib/librte_eal/common/include/generic/rte_prefetch.h
index 217f319..ee4a9ee 100644
--- a/lib/librte_eal/common/include/generic/rte_prefetch.h
+++ b/lib/librte_eal/common/include/generic/rte_prefetch.h
@@ -51,14 +51,14 @@
  * @param p
  *   Address to prefetch
  */
-static inline void rte_prefetch0(volatile void *p);
+static inline void rte_prefetch0(const volatile void *p);
 
 /**
  * Prefetch a cache line into all cache levels except the 0th cache level.
  * @param p
  *   Address to prefetch
  */
-static inline void rte_prefetch1(volatile void *p);
+static inline void rte_prefetch1(const volatile void *p);
 
 /**
  * Prefetch a cache line into all cache levels except the 0th and 1th cache
@@ -66,6 +66,6 @@ static inline void rte_prefetch1(volatile void *p);
  * @param p
  *   Address to prefetch
  */
-static inline void rte_prefetch2(volatile void *p);
+static inline void rte_prefetch2(const volatile void *p);
 
 #endif /* _RTE_PREFETCH_H_ */
-- 
2.4.2