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| author | Anton Blanchard <anton@samba.org> | 2010-04-06 17:02:19 +1000 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-04-06 10:01:35 +0200 |
| commit | 84fba5ec91f11c0efb27d0ed6098f7447491f0df (patch) | |
| tree | ca48cd8f7baddf29c2bcfc3cc0c7853298449f7b /kernel/sched.c | |
| parent | db217dece3003df0841bacf9556b5c06aa097dae (diff) | |
| download | lwn-84fba5ec91f11c0efb27d0ed6098f7447491f0df.tar.gz lwn-84fba5ec91f11c0efb27d0ed6098f7447491f0df.zip | |
sched: Fix sched_getaffinity()
taskset on 2.6.34-rc3 fails on one of my ppc64 test boxes with
the following error:
sched_getaffinity(0, 16, 0x10029650030) = -1 EINVAL (Invalid argument)
This box has 128 threads and 16 bytes is enough to cover it.
Commit cd3d8031eb4311e516329aee03c79a08333141f1 (sched:
sched_getaffinity(): Allow less than NR_CPUS length) is
comparing this 16 bytes agains nr_cpu_ids.
Fix it by comparing nr_cpu_ids to the number of bits in the
cpumask we pass in.
Signed-off-by: Anton Blanchard <anton@samba.org>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Sharyathi Nagesh <sharyath@in.ibm.com>
Cc: Ulrich Drepper <drepper@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Russ Anderson <rja@sgi.com>
Cc: Mike Travis <travis@sgi.com>
LKML-Reference: <20100406070218.GM5594@kryten>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 528a10592c16..eaf5c7375dfd 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -4902,7 +4902,7 @@ SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len, int ret; cpumask_var_t mask; - if (len < nr_cpu_ids) + if ((len * BITS_PER_BYTE) < nr_cpu_ids) return -EINVAL; if (len & (sizeof(unsigned long)-1)) return -EINVAL; |