[lkml]   [2001]   [Apr]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: BUG: Global FPU corruption in 2.2
> >1.) If I'm not mistaken switch_to changes current->flags without
> >atomic operations and without any locks and sys_ptrace changes
> >child->flags only protected by the big kernel lock.
> ptrace only operates on processes that are stopped. So there are no
> locking issues - we've synchronized on a much higher level than a
> spinlock or semaphore.

In the 2.2 case the ptrace flags themselves are in the same flag set as
the PF_ flags. In 2.4 that was fixed. That means there are some bizarre cases
where current->flags might not be handled perfectly.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:27    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean