tree 04ea03bb23d59080ce52012095591874cad6cf49
parent 84ee9805bc7406bee35f2d62001440c81059f073
author Chris Metcalf <cmetcalf@tilera.com> 1365525187 -0400
committer Linus Torvalds <torvalds@linux-foundation.org> 1365527294 -0700

tile: comment assumption about __insn_mtspr for <asm/irqflags.h>

The arch_local_irq_save(), etc., routines are required to function
as compiler barriers.  They do, but it's subtle and requires knowing
that the gcc builtin __insn_mtspr() is marked as a memory clobber.
Provide a comment explaining the assumption.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
[ This came about from me wondering about the synchronization rules of
  __insn_mtspr()   - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>