cpusets: fix bug when adding nonexistent cpu or mem
Adding a nonexistent cpu to a cpuset will be omitted quietly. It should
return -EINVAL.
Example: (real_nr_cpus <= 4 < NR_CPUS or cpu#4 was just offline)
# cat cpus
0-1
# /bin/echo 4 > cpus
# /bin/echo $?
0
# cat cpus
#
The same occurs when add a nonexistent mem.
This patch will fix this bug.
And when *buf == "", the check is unneeded.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Paul Jackson <pj@sgi.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 86ea9e3..039baa4 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -797,8 +797,10 @@
retval = cpulist_parse(buf, trialcs.cpus_allowed);
if (retval < 0)
return retval;
+
+ if (!cpus_subset(trialcs.cpus_allowed, cpu_online_map))
+ return -EINVAL;
}
- cpus_and(trialcs.cpus_allowed, trialcs.cpus_allowed, cpu_online_map);
retval = validate_change(cs, &trialcs);
if (retval < 0)
return retval;
@@ -932,9 +934,11 @@
retval = nodelist_parse(buf, trialcs.mems_allowed);
if (retval < 0)
goto done;
+
+ if (!nodes_subset(trialcs.mems_allowed,
+ node_states[N_HIGH_MEMORY]))
+ return -EINVAL;
}
- nodes_and(trialcs.mems_allowed, trialcs.mems_allowed,
- node_states[N_HIGH_MEMORY]);
oldmem = cs->mems_allowed;
if (nodes_equal(oldmem, trialcs.mems_allowed)) {
retval = 0; /* Too easy - nothing to do */