drm/i915: Add compiler barrier to wait_for

We need to be careful to not let compiler evaluate
the expiration and the operation on it's terms.

Document and enforce that COND will be evaluated
before checking timeout expiration.

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180423113754.28424-2-mika.kuoppala@linux.intel.com

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 33ff263..58868b9 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -56,6 +56,8 @@
        for (;;) {                                                      \
                const bool expired__ = ktime_after(ktime_get_raw(), end__); \
                OP;                                                     \
+               /* Guarantee COND check prior to timeout */             \
+               barrier();                                              \
                if (COND) {                                             \
                        ret__ = 0;                                      \
                        break;                                          \
@@ -96,6 +98,8 @@
                u64 now = local_clock(); \
                if (!(ATOMIC)) \
                        preempt_enable(); \
+               /* Guarantee COND check prior to timeout */ \
+               barrier(); \
                if (COND) { \
                        ret = 0; \
                        break; \