Russell King wrote:
On Fri, Aug 12, 2005 at 08:21:45PM +0200, [email protected] wrote:
@@ -632,10 +632,11 @@ static inline int page_mapped(struct pag
* Used to decide whether a process gets delivered SIGBUS or
* just gets major/minor fault counters bumped up.
*/
-#define VM_FAULT_OOM (-1)
-#define VM_FAULT_SIGBUS 0
-#define VM_FAULT_MINOR 1
-#define VM_FAULT_MAJOR 2
+#define VM_FAULT_OOM (-1)
+#define VM_FAULT_SIGBUS 0
+#define VM_FAULT_MINOR 1
+#define VM_FAULT_MAJOR 2
+#define VM_FAULT_SIGSEGV 3
#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
Please arrange for "success" values to be numerically larger than "failure"
values. This will avoid breaking ARM.
Is there a reason why we don't use -ve numbers for failure and +ve for
success here?
Well there is now, and that is we are now using a bit in the 2nd
byte as flags. So I had to do away with -ve numbers there entirely.
You could achieve a similar thing by using another bit in that byte
#define VM_FAULT_FAILED 0x20
and make that bit present in VM_FAULT_OOM and VM_FAULT_SIGBUS, then
do an unlikely test for that bit in your handler and branch away to
the slow path.
--
SUSE Labs, Novell Inc.
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