Drop usage of CK_CC_PACKED, prefer natural alignment.

CK_CC_PACKED will drop structures to one-byte alignment in certain
cases. Obviously, this will mean bad performance on most architectures.
Thanks to Matt Johnson from https://rigel.crhc.illinois.edu/ for
reporting this problem.

include/ck_bytelock.h

@@ -47,7 +47,7 @@ struct ck_bytelock {
 	unsigned int owner;
 	unsigned int n_readers;
 	uint8_t readers[CK_MD_CACHELINE - sizeof(unsigned int) * 2] CK_CC_ALIGN(8);
-} CK_CC_PACKED;
+};
 typedef struct ck_bytelock ck_bytelock_t;
 
 #define CK_BYTELOCK_INITIALIZER { 0, 0, {0} }

include/ck_fifo.h

@@ -47,7 +47,7 @@ struct ck_fifo_spsc {
 	struct ck_fifo_spsc_entry *tail;
 	struct ck_fifo_spsc_entry *head_snapshot;
 	struct ck_fifo_spsc_entry *garbage;
-} CK_CC_PACKED;
+};
 typedef struct ck_fifo_spsc ck_fifo_spsc_t;
 
 CK_CC_INLINE static void
@@ -139,7 +139,7 @@ ck_fifo_spsc_recycle(struct ck_fifo_spsc *fifo)
 struct ck_fifo_mpmc_entry;
 struct ck_fifo_mpmc_pointer {
 	struct ck_fifo_mpmc_entry *pointer;
-	char *generation;
+	char *generation CK_CC_PACKED;
 } CK_CC_ALIGN(16);
 
 struct ck_fifo_mpmc_entry {
@@ -154,7 +154,7 @@ struct ck_fifo_mpmc {
 	struct ck_fifo_mpmc_pointer tail;
 	struct ck_fifo_mpmc_entry *head_snapshot;
 	struct ck_fifo_mpmc_pointer garbage;
-} CK_CC_PACKED;
+};
 typedef struct ck_fifo_mpmc ck_fifo_mpmc_t;
 
 CK_CC_INLINE static void

include/ck_ring.h

@@ -116,7 +116,7 @@ struct ck_ring {
 	unsigned int size;
 	unsigned int mask;
 	void **ring;
-} CK_CC_PACKED;
+};
 typedef struct ck_ring ck_ring_t;
 
 /*

include/ck_spinlock.h

@@ -351,7 +351,7 @@ ck_spinlock_dec_unlock(struct ck_spinlock_dec *lock)
 struct ck_spinlock_ticket {
 	unsigned int next;
 	unsigned int position;
-} CK_CC_PACKED;
+};
 typedef struct ck_spinlock_ticket ck_spinlock_ticket_t;
 
 #define CK_SPINLOCK_TICKET_INITIALIZER {.next = 0, .position = 0}

include/ck_stack.h

@@ -40,8 +40,8 @@ typedef struct ck_stack_entry ck_stack_entry_t;
 
 struct ck_stack {
 	struct ck_stack_entry *head;
-	char *generation;
+	char *generation CK_CC_PACKED;
-} CK_CC_PACKED CK_CC_ALIGN(16);
+};
 typedef struct ck_stack ck_stack_t;
 
 #define CK_STACK_INITIALIZER { NULL, NULL }