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linux-atomic.c (EBUSY): Define if not _LP64. 

* 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
This commit is contained in:
Helge Deller 2008-11-23 21:14:59 +00:00 committed by John David Anglin
parent 12da694bc0
commit 74e6a47563
2 changed files with 15 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
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.

10
gcc/config/pa/linux-atomic.c
View File

@ -33,8 +33,9 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
#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
@ -74,6 +75,13 @@ __kernel_cmpxchg (int oldval, int newval, int *mem)
);
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;
}