[Xen-changelog] Turn off debug output for NaTpage consumption when ifa==0.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User djm@xxxxxxxxxxxxxxx
# Node ID 7ef565a7cc8612548f41833e33045b033fb89729
# Parent  e1ae4b162128f5b16c626d77c25215a37f9da6e7
Turn off debug output for NaTpage consumption when ifa==0.
In RHEL4, __strcpy_from_user seems to do this a lot (legally)
and the massive debug output may hide other errors.

diff -r e1ae4b162128 -r 7ef565a7cc86 xen/arch/ia64/xen/process.c
--- a/xen/arch/ia64/xen/process.c       Thu Dec 15 22:17:04 2005
+++ b/xen/arch/ia64/xen/process.c       Thu Dec 15 23:17:06 2005
@@ -743,6 +743,13 @@
                        printf("ia64_handle_reflection: handling regNaT fault");
                        vector = IA64_NAT_CONSUMPTION_VECTOR; break;
                }
+#if 1
+               // pass null pointer dereferences through with no error
+               // but retain debug output for non-zero ifa
+               if (!ifa) {
+                       vector = IA64_NAT_CONSUMPTION_VECTOR; break;
+               }
+#endif
 printf("*** NaT fault... attempting to handle as privop\n");
 printf("isr=%p, ifa=%p,iip=%p,ipsr=%p\n",isr,ifa,regs->cr_iip,psr);
                //regs->eml_unat = 0;  FIXME: DO WE NEED THIS???

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