[PATCH v3] eal: Pointer alignment check improvements

["Morten Brørup" <mb@smartsharesystems.com>]

Checking a const pointer for alignment would emit a warning about the
const qualifier being discarded.

No need to calculate the aligned pointer; just check the last bits of the
pointer.

v3:
- Make the uintptr_t const to avoid potential future warnings. (Bruce)
v2:
- Remove compiler attribute ((const)) from function;
  it was a coding style issue.

Signed-off-by: Morten Brørup <mb@smartsharesystems.com>
---
 lib/eal/include/rte_common.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/eal/include/rte_common.h b/lib/eal/include/rte_common.h
index 2e22c1b955..ed81e0db0a 100644
--- a/lib/eal/include/rte_common.h
+++ b/lib/eal/include/rte_common.h
@@ -404,9 +404,9 @@ static void __attribute__((destructor(RTE_PRIO(prio)), used)) func(void)
  *   True(1) where the pointer is correctly aligned, false(0) otherwise
  */
 static inline int
-rte_is_aligned(void *ptr, unsigned align)
+rte_is_aligned(const void * const __rte_restrict ptr, const unsigned int align)
 {
-	return RTE_PTR_ALIGN(ptr, align) == ptr;
+	return ((const uintptr_t)ptr & (align - 1)) == 0;
 }
 
 /*********** Macros for compile type checks ********/
-- 
2.17.1