ck_spinlock: Only enable trylock for ck_spinlock_ticket on x86*.

trylock algorithm semantics are not cleanly defined outside of x86.
12 years ago · a5e8d6ad45
parent b1a40dcc34
commit a5e8d6ad45
1 changed files with 2 additions and 2 deletions
--- a/include/ck_spinlock.h
+++ b/include/ck_spinlock.h
@ -408,9 +408,9 @@ ck_spinlock_dec_unlock(struct ck_spinlock_dec *lock)
 /*
 * If 16-bit or 32-bit increment is supported, implement support for
 * trylock functionality on availability of 32-bit or 64-bit fetch-and-add
- * and compare-and-swap.
+ * and compare-and-swap. This code path is only applied to x86*.
 */
-#if defined(CK_MD_TSO)
+#if defined(CK_MD_TSO) && (defined(__x86__) || defined(__x86_64__))
 #if defined(CK_F_PR_FAA_32) && defined(CK_F_PR_INC_16) && defined(CK_F_PR_CAS_32)
 #define CK_SPINLOCK_TICKET_TYPE         uint32_t
 #define CK_SPINLOCK_TICKET_TYPE_BASE    uint16_t