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.
v2:
- use "1UL" to avoid the verbose cast suggested by Tony.
Suggested-by: Tony Luck <[email protected]>
Signed-off-by: Xie XiuQi <[email protected]>
---
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..9f651c1 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] = 1UL << k;
if (sched_setaffinity(0, MASK_SIZE*8, mask)==-1) {
perror("Error sched_setaffinity:");
--
1.6.0.2