linux-kernel - Re: linux-next: Tree for July 20 (acpi/apei/ghes)

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Date:	Tue, 02 Aug 2011 18:05:00 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	linux-acpi@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Huang Ying <ying.huang@...el.com>
Subject: Re: linux-next: Tree for July 20 (acpi/apei/ghes)

From: Len Brown <len.brown@...el.com>
Subject: [PATCH] APEI GHES: 32-bit buildfix

drivers/acpi/apei/ghes.c:542: warning: integer overflow in expression
drivers/acpi/apei/ghes.c:619: warning: integer overflow in expression

ghes.c:(.text+0x46289): undefined reference to `__udivdi3'
  in function ghes_estatus_cache_add().

Reported-by: Randy Dunlap <rdunlap@...otime.net>
Signed-off-by: Len Brown <len.brown@...el.com>
---
 drivers/acpi/apei/ghes.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index e92c47c..0784f99 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -65,7 +65,7 @@
 
 #define GHES_ESTATUS_CACHES_SIZE	4
 
-#define GHES_ESTATUS_IN_CACHE_MAX_NSEC	(10 * NSEC_PER_SEC)
+#define GHES_ESTATUS_IN_CACHE_MAX_NSEC	10000000000ULL
 /* Prevent too many caches are allocated because of RCU */
 #define GHES_ESTATUS_CACHE_ALLOCED_MAX	(GHES_ESTATUS_CACHES_SIZE * 3 / 2)
 
@@ -622,7 +622,8 @@ static void ghes_estatus_cache_add(
 			break;
 		}
 		count = atomic_read(&cache->count);
-		period = duration / (count + 1);
+		period = duration;
+		do_div(period, (count + 1));
 		if (period > max_period) {
 			max_period = period;
 			slot = i;
-- 
1.7.6.396.ge0613