path: root/drivers/gpu/drm/vmwgfx
diff options
authorPaul E. McKenney <>2017-10-23 14:07:25 -0700
committerIngo Molnar <>2017-10-25 11:01:06 +0200
commitb03a0fe0c5e4b46dcd400d27395b124499554a71 (patch)
treed36452ac27e2f27487af9f930d7a54f3fa01f718 /drivers/gpu/drm/vmwgfx
parent3587679d93d0b0e4c31e5a2ad1dffdfcb77e8526 (diff)
locking/atomics, mm: Convert ACCESS_ONCE() to READ_ONCE()/WRITE_ONCE()
For several reasons, it is desirable to use {READ,WRITE}_ONCE() in preference to ACCESS_ONCE(), and new code is expected to use one of the former. So far, there's been no reason to change most existing uses of ACCESS_ONCE(), as these aren't currently harmful. However, for some features it is necessary to instrument reads and writes separately, which is not possible with ACCESS_ONCE(). This distinction is critical to correct operation. It's possible to transform the bulk of kernel code using the Coccinelle script below. However, this doesn't handle comments, leaving references to ACCESS_ONCE() instances which have been removed. As a preparatory step, this patch converts the mm code and comments to use {READ,WRITE}_ONCE() consistently. ---- virtual patch @ depends on patch @ expression E1, E2; @@ - ACCESS_ONCE(E1) = E2 + WRITE_ONCE(E1, E2) @ depends on patch @ expression E; @@ - ACCESS_ONCE(E) + READ_ONCE(E) ---- Signed-off-by: Paul E. McKenney <> Acked-by: Will Deacon <> Acked-by: Mark Rutland <> Cc: Linus Torvalds <> Cc: Peter Zijlstra <> Cc: Thomas Gleixner <> Cc: Cc: Cc: Cc: Cc: Cc: Cc: Cc: Link: Signed-off-by: Ingo Molnar <>
Diffstat (limited to 'drivers/gpu/drm/vmwgfx')
0 files changed, 0 insertions, 0 deletions