tree 2261c23bf8c77e51628310057b4dde718e487c53
parent 02cabab4a8a7ef2d51189d5dda84516d36662910
author Nicolas Pitre <nico@cam.org> 1226208473 -0500
committer Linus Torvalds <torvalds@linux-foundation.org> 1226258253 -0800

clarify usage expectations for cnt32_to_63()

Currently, all existing users of cnt32_to_63() are fine since the CPU
architectures where it is used don't do read access reordering, and user
mode preemption is disabled already.  It is nevertheless a good idea to
better elaborate usage requirements wrt preemption, and use an explicit
memory barrier on SMP to avoid different CPUs accessing the counter
value in the wrong order.  On UP a simple compiler barrier is
sufficient.

Signed-off-by: Nicolas Pitre <nico@marvell.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>