[PATCH v3] Avoid memory barrier in read_seqcount() through load acquire

[Christoph Lameter (Ampere)]

On Fri, 13 Sep 2024, kernel test robot wrote:

> >> drivers/gpu/drm/i915/gt/intel_tlb.h:21:47: error: macro "seqprop_sequence" requires 2 arguments, but only 1 given

>From 15d86bc9589f16947c5fb0f34d2947eacd48f853 Mon Sep 17 00:00:00 2001
From: Christoph Lameter <cl at gentwo.org>
Date: Mon, 16 Sep 2024 10:44:16 -0700
Subject: [PATCH] Update Intel DRM use of seqprop_sequence

One of Intels drivers uses seqprop_sequence() for its tlb sequencing.
We added a parameter so that we can use acquire. Its pretty safe to
assume that this will work without acquire.

Signed-off-by: Christoph Lameter <cl at linux.com>
---
 drivers/gpu/drm/i915/gt/intel_tlb.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_tlb.h b/drivers/gpu/drm/i915/gt/intel_tlb.h
index 337327af92ac..81998c4cd4fb 100644
--- a/drivers/gpu/drm/i915/gt/intel_tlb.h
+++ b/drivers/gpu/drm/i915/gt/intel_tlb.h
@@ -18,7 +18,7 @@ void intel_gt_fini_tlb(struct intel_gt *gt);

 static inline u32 intel_gt_tlb_seqno(const struct intel_gt *gt)
 {
-	return seqprop_sequence(&gt->tlb.seqno);
+	return seqprop_sequence(&gt->tlb.seqno, false);
 }

 static inline u32 intel_gt_next_invalidate_tlb_full(const struct intel_gt *gt)
-- 
2.39.5