* pa/linux-atomic.c (EBUSY): Define if not _LP64.
(__kernel_cmpxchg): Return -EBUSY if the kernel LWS call
succeeded and lws_ret is not equal to oldval.
From-SVN: r142141
+2008-11-23 Helge Deller <deller@gmx.de>
+
+ * pa/linux-atomic.c (EBUSY): Define if not _LP64.
+ (__kernel_cmpxchg): Return -EBUSY if the kernel LWS call
+ succeeded and lws_ret is not equal to oldval.
+
2008-11-23 Kaz Kojima <kkojima@gcc.gnu.org>
* config/sh/sh.md (consttable_4): Call mark_symbol_refs_as_used.
#ifndef _LP64
#include <errno.h>
#else
+#define EFAULT 14
+#define EBUSY 16
#define ENOSYS 251
-#define EFAULT 14
#endif
/* All PA-RISC implementations supported by linux have strongly
);
if (__builtin_expect (lws_errno == -EFAULT || lws_errno == -ENOSYS, 0))
ABORT_INSTRUCTION;
+
+ /* If the kernel LWS call succeeded (lws_errno == 0), lws_ret contains
+ the old value from memory. If this value is equal to OLDVAL, the
+ new value was written to memory. If not, return -EBUSY. */
+ if (!lws_errno && lws_ret != oldval)
+ lws_errno = -EBUSY;
+
return lws_errno;
}