linux-kernel - [PATCH] ia64: Fix example error_injection

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Date:	Thu, 28 Mar 2013 10:54:37 +0800
From:	Xie XiuQi <xiexiuqi@...wei.com>
To:	<fenghua.yu@...el.com>
CC:	<linux-kernel@...r.kernel.org>, Tony Luck <tony.luck@...el.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Yijing Wang <wangyijing@...wei.com>
Subject: [PATCH] ia64: Fix example error_injection_tool

I got a "sched_setaffinity:: Invalid argument" error when using
err_injection_tool to inject error on a system with over 32 cpus.

Error information when injecting an error on a system with over 32 cpus:
$ ./err_injection_tool -i
/sys/devices/system/cpu/cpu0/err_inject//err_type_info
Begine at Tue Mar 26 11:20:08 2013
Configurations:
On cpu32: loop=10, interval=5(s) err_type_info=4101,err_struct_info=95
Error sched_setaffinity:: Invalid argument
All done

This because there is overflow when calculating the cpumask: the
type of (1<<k) is int, while mask[j] is unsigned long. When k > 31,
(1<<k) is truncated to ZERO, resulting in a unexpected cpumask.

Signed-off-by: Xie XiuQi <xiexiuqi@...wei.com>
---
 Documentation/ia64/err_inject.txt |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/Documentation/ia64/err_inject.txt b/Documentation/ia64/err_inject.txt
index 223e4f0..ec61ac1 100644
--- a/Documentation/ia64/err_inject.txt
+++ b/Documentation/ia64/err_inject.txt
@@ -882,7 +882,7 @@ int err_inj()
 			cpu=parameters[i].cpu;
 			k = cpu%64;
 			j = cpu/64;
-			mask[j]=1<<k;
+			mask[j] = (unsigned long)1<<k;

 			if (sched_setaffinity(0, MASK_SIZE*8, mask)==-1) {
 				perror("Error sched_setaffinity:");
-- 
1.6.0.2

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