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authorDavid Rientjes <rientjes@google.com>2008-06-05 15:57:11 -0400
committerIngo Molnar <mingo@elte.hu>2008-06-10 06:26:16 -0400
commit9985b0bab332289f14837eff3c6e0bcc658b58f7 (patch)
tree8c4bcbc4348c473b14644dc4d371a45c0dabda53 /kernel/kthread.c
parent7def2be1dc679984f4c4fb3ef19a8a081b2454ec (diff)
sched: prevent bound kthreads from changing cpus_allowed
Kthreads that have called kthread_bind() are bound to specific cpus, so other tasks should not be able to change their cpus_allowed from under them. Otherwise, it is possible to move kthreads, such as the migration or software watchdog threads, so they are not allowed access to the cpu they work on. Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul Menage <menage@google.com> Cc: Paul Jackson <pj@sgi.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/kthread.c')
-rw-r--r--kernel/kthread.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/kthread.c b/kernel/kthread.c
index bd1b9ea024e1..97747cdd37c9 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -180,6 +180,7 @@ void kthread_bind(struct task_struct *k, unsigned int cpu)
180 set_task_cpu(k, cpu); 180 set_task_cpu(k, cpu);
181 k->cpus_allowed = cpumask_of_cpu(cpu); 181 k->cpus_allowed = cpumask_of_cpu(cpu);
182 k->rt.nr_cpus_allowed = 1; 182 k->rt.nr_cpus_allowed = 1;
183 k->flags |= PF_THREAD_BOUND;
183} 184}
184EXPORT_SYMBOL(kthread_bind); 185EXPORT_SYMBOL(kthread_bind);
185 186