[PATCH RFC 0/2] Reenable might_sleep() checks for might_fault() when atomic

[David Hildenbrand <dahi@linux.vnet.ibm.com>]

Simple prototype to enable might_sleep() checks in might_fault(), avoiding false
positives for scenarios involving explicit pagefault_disable().

So this should work:
	spin_lock(&lock); /* also if left away */
	pagefault_disable()
	rc = copy_to_user(...)
	pagefault_enable();
	spin_unlock(&lock); /*

And this should report a warning again:
	spin_lock(&lock);
	rc = copy_to_user(...);
	spin_unlock(&lock);

Still missing:
- Split of preempt documentation update + preempt_active define reshuffle
- Debug version to test for over/underflows
- Change documentation of user access methods to reflect the real behavior
- Don't touch the preempt counter, only the pagefault disable counter (future
  work)

David Hildenbrand (2):
  preempt: track pagefault_disable() calls in the preempt counter
  mm, sched: trigger might_sleep() in might_fault() when pagefaults are
    disabled

 include/linux/kernel.h       |  9 +++++++--
 include/linux/preempt_mask.h | 24 +++++++++++++++++++-----
 include/linux/uaccess.h      | 21 ++++++++++++++-------
 mm/memory.c                  | 15 ++++-----------
 4 files changed, 44 insertions(+), 25 deletions(-)

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1.8.5.5