Gcc (and recent versions of Clang) have a function attribute that hints to the optimizer that it doesn't need to worry about aliasing on a pointer returned from malloc.
Signed-off-by: Stephen Hemminger <step...@networkplumber.org> --- lib/librte_eal/include/rte_common.h | 11 +++++++++++ lib/librte_eal/include/rte_malloc.h | 4 ++++ 2 files changed, 15 insertions(+) diff --git a/lib/librte_eal/include/rte_common.h b/lib/librte_eal/include/rte_common.h index 8f487a563dfc..6b85374c0fe5 100644 --- a/lib/librte_eal/include/rte_common.h +++ b/lib/librte_eal/include/rte_common.h @@ -112,6 +112,17 @@ typedef uint16_t unaligned_uint16_t; #define __rte_restrict restrict #endif +/** + * Mark function as returing a pointer which if non-NULL + * cannot alias any other valid pointer and that the memory + * contents are undefined. I.e behaves like malloc. + */ +#if RTE_CC_IS_GNU +#define __rte_malloc __attribute__((malloc)) +#else +#define __rte_malloc +#endif + /** * definition to mark a variable or function parameter as used so * as to avoid a compiler warning diff --git a/lib/librte_eal/include/rte_malloc.h b/lib/librte_eal/include/rte_malloc.h index 42ca05182f8e..721560122c70 100644 --- a/lib/librte_eal/include/rte_malloc.h +++ b/lib/librte_eal/include/rte_malloc.h @@ -79,6 +79,7 @@ rte_malloc(const char *type, size_t size, unsigned align); * align is not a power of two). * - Otherwise, the pointer to the allocated object. */ +__rte_malloc void * rte_zmalloc(const char *type, size_t size, unsigned align); @@ -105,6 +106,7 @@ rte_zmalloc(const char *type, size_t size, unsigned align); * align is not a power of two). * - Otherwise, the pointer to the allocated object. */ +__rte_malloc void * rte_calloc(const char *type, size_t num, size_t size, unsigned align); @@ -180,6 +182,7 @@ rte_realloc_socket(void *ptr, size_t size, unsigned int align, int socket); * align is not a power of two). * - Otherwise, the pointer to the allocated object. */ +__rte_malloc void * rte_malloc_socket(const char *type, size_t size, unsigned align, int socket); @@ -236,6 +239,7 @@ rte_zmalloc_socket(const char *type, size_t size, unsigned align, int socket); * align is not a power of two). * - Otherwise, the pointer to the allocated object. */ +__rte_malloc void * rte_calloc_socket(const char *type, size_t num, size_t size, unsigned align, int socket); -- 2.27.0
