From: Prarit Bhargava <prarit@redhat.com>
Date: Wed, 22 Aug 2007 18:34:38 +0000 (-0400)
Subject: [IA64] Stop bogus NMI & softlockup warnings in ia64 show_mem
X-Git-Tag: v2.6.23-rc6~24^2~2
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=99a19cf1c0eb22bad83fff060f08330ee9e029e2;p=linux-2.6

[IA64] Stop bogus NMI & softlockup warnings in ia64 show_mem

When dumping memory via sysrq-m it is possible to take a bogus NMI watchdog
or softlockup watchdog because the dump can take a long time on big memory
systems.

Occasionally tickle the watchdog when doing the dump.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
---

diff --git a/arch/ia64/mm/contig.c b/arch/ia64/mm/contig.c
index 7ac8592a35..d3c538be46 100644
--- a/arch/ia64/mm/contig.c
+++ b/arch/ia64/mm/contig.c
@@ -17,6 +17,7 @@
 #include <linux/bootmem.h>
 #include <linux/efi.h>
 #include <linux/mm.h>
+#include <linux/nmi.h>
 #include <linux/swap.h>
 
 #include <asm/meminit.h>
@@ -56,6 +57,8 @@ void show_mem(void)
 		present = pgdat->node_present_pages;
 		for(i = 0; i < pgdat->node_spanned_pages; i++) {
 			struct page *page;
+			if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
+				touch_nmi_watchdog();
 			if (pfn_valid(pgdat->node_start_pfn + i))
 				page = pfn_to_page(pgdat->node_start_pfn + i);
 			else {
diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
index 0dbf0e81f8..0d34585058 100644
--- a/arch/ia64/mm/discontig.c
+++ b/arch/ia64/mm/discontig.c
@@ -16,6 +16,7 @@
 
 #include <linux/kernel.h>
 #include <linux/mm.h>
+#include <linux/nmi.h>
 #include <linux/swap.h>
 #include <linux/bootmem.h>
 #include <linux/acpi.h>
@@ -533,6 +534,8 @@ void show_mem(void)
 		present = pgdat->node_present_pages;
 		for(i = 0; i < pgdat->node_spanned_pages; i++) {
 			struct page *page;
+			if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
+				touch_nmi_watchdog();
 			if (pfn_valid(pgdat->node_start_pfn + i))
 				page = pfn_to_page(pgdat->node_start_pfn + i);
 			else {