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| author |   Chris Metcalf <cmetcalf@tilera.com> | 2013-04-09 12:33:07 -0400 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2013-04-09 10:08:14 -0700 |
| commit | 3e2e0d2c222bdf5bafd722dec1618fa6073ef372 (patch) | |
| tree | 04ea03bb23d59080ce52012095591874cad6cf49 /include | |
| parent | Merge tag 'hwspinlock-3.9-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ohad/hwspinlock (diff) | |
| download | linux-dev-3e2e0d2c222bdf5bafd722dec1618fa6073ef372.tar.xz linux-dev-3e2e0d2c222bdf5bafd722dec1618fa6073ef372.zip | |
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>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions