TaiJuWu commented on code in PR #10605:
URL: https://github.com/apache/nuttx/pull/10605#discussion_r1331417329
##########
arch/arm64/include/spinlock.h:
##########
@@ -83,6 +83,25 @@
* -- Clear Exclusive access monitor (CLREX) This is used to
* clear the state of the Local Exclusive Monitor.
*/
+#if defined(CONFIG_TICKET_SPINLOCK)
+#include <stdatomic.h>
+
+/* Memory layout is related uint64_t in arm64 little endian
+ * if uint64 is 0x010203040A0B0C0D, the next is 0A0B0C0D and
+ * the owner is 01020304.
+ */
+
+struct ticket_spinlock_s
+{
+ atomic_uint next;
Review Comment:
@xiaoxiang781216 Sorry but I have a question is is it possible use 32bit
spinlock on 64bit machine?
I found the
[page.](http://lists.infradead.org/pipermail/linux-arm-kernel/2013-October/203491.html)
In the bottom of page, it shows ticket spinlock is 32bit even on 64 bit
machine.
I've attempted to modify spinlock_t to 32bit but it failed.
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