[RFC Patch 5/6] Modify Data storage exception code to recognise DABR match first

[K.Prasad]

Modify Data storage exception code to first lookout for a DABR match before
recognising a kprobe or xmon exception.

Signed-off-by: K.Prasad <prasad at linux.vnet.ibm.com>
---
 arch/powerpc/mm/fault.c                  |   14 -

Index: linux-2.6-tip.hbkpt/arch/powerpc/mm/fault.c
===================================================================
--- linux-2.6-tip.hbkpt.orig/arch/powerpc/mm/fault.c	2009-05-14 00:17:24.000000000 +0530
+++ linux-2.6-tip.hbkpt/arch/powerpc/mm/fault.c	2009-05-14 00:58:05.000000000 +0530
@@ -137,6 +137,12 @@
 		error_code &= 0x48200000;
 	else
 		is_write = error_code & DSISR_ISSTORE;
+
+	if (error_code & DSISR_DABRMATCH) {
+		/* DABR match */
+		do_dabr(regs, address, error_code);
+		return 0;
+	}
 #else
 	is_write = error_code & ESR_DST;
 #endif /* CONFIG_4xx || CONFIG_BOOKE */
@@ -151,14 +157,6 @@
 	if (!user_mode(regs) && (address >= TASK_SIZE))
 		return SIGSEGV;
 
-#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
-  	if (error_code & DSISR_DABRMATCH) {
-		/* DABR match */
-		do_dabr(regs, address, error_code);
-		return 0;
-	}
-#endif /* !(CONFIG_4xx || CONFIG_BOOKE)*/
-
 	if (in_atomic() || mm == NULL) {
 		if (!user_mode(regs))
 			return SIGSEGV;