Fix wrong allocation size of ringbuffer

Author: RinHizakura

ringbuffer/ringbuffer.c

@@ -56,6 +56,7 @@ typedef struct {
 #define RING_SIZE_MASK (unsigned) (0x0fffffff) /**< Ring size mask */
 #define ALIGN_FLOOR(val, align) \
     (typeof(val))((val) & (~((typeof(val))((align) -1))))
+#define ALIGN_CEIL(val, align) (ALIGN_FLOOR((val) -1, align) + (align))
 
 /**
  * Calculate the memory size needed for a ring buffer.
@@ -80,7 +81,7 @@ ssize_t ringbuf_get_memsize(const unsigned count)
         return -EINVAL;
 
     ssize_t sz = sizeof(ringbuf_t) + count * sizeof(void *);
-    sz = ALIGN_FLOOR(sz, CACHE_LINE_SIZE);
+    sz = ALIGN_CEIL(sz, CACHE_LINE_SIZE);
     return sz;
 }