[PATCH] sys_sched_getaffinity() & hotplug
authorJack Steiner <steiner@sgi.com>
Wed, 1 Feb 2006 11:05:18 +0000 (03:05 -0800)
committerLinus Torvalds <torvalds@g5.osdl.org>
Wed, 1 Feb 2006 16:53:13 +0000 (08:53 -0800)
Change sched_getaffinity() so that it returns a bitmap that indicates the
legally schedulable cpus that a task is allowed to run on.

Without this patch, if CONFIG_HOTPLUG_CPU is enabled, sched_getaffinity()
unconditionally returns (at least on IA64) a mask with NR_CPUS bits set.
This conveys no useful infornmation except for a kernel compile option.

This fixes a breakage we obseved running recent kernels. We have MPI jobs
that use sched_getaffinity() to determine where to place their threads.
Placing them on non-existant cpus is problematic :-)

Signed-off-by: Jack Steiner <steiner@sgi.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Nathan Lynch <ntl@pobox.com>
Cc: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
kernel/sched.c

index ec7fd9cee30665e7626ec7d3fb92f9ee6bd57731..f77f23f8f479c898666082f3c9da0d52bb5a5bab 100644 (file)
@@ -4031,7 +4031,7 @@ long sched_getaffinity(pid_t pid, cpumask_t *mask)
                goto out_unlock;
 
        retval = 0;
-       cpus_and(*mask, p->cpus_allowed, cpu_possible_map);
+       cpus_and(*mask, p->cpus_allowed, cpu_online_map);
 
 out_unlock:
        read_unlock(&tasklist_lock);