linux-kernel - [PATCH 1/9] drm/i915/gvt: Constify intel_gvt_gtt_pte

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Date:   Sat,  4 Dec 2021 11:55:19 +0100
From:   Rikard Falkeborn <rikard.falkeborn@...il.com>
To:     Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Rikard Falkeborn <rikard.falkeborn@...il.com>
Subject: [PATCH 1/9] drm/i915/gvt: Constify intel_gvt_gtt_pte_ops

These are never modified, so make them const to allow the compiler to
put them in read-only memory.

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@...il.com>
---
 drivers/gpu/drm/i915/gvt/gtt.c | 4 ++--
 drivers/gpu/drm/i915/gvt/gtt.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index 53d0cb327539..6efa48727052 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -516,7 +516,7 @@ static struct intel_gvt_gtt_pte_ops gen8_gtt_pte_ops = {
 	.set_pfn = gen8_gtt_set_pfn,
 };
 
-static struct intel_gvt_gtt_gma_ops gen8_gtt_gma_ops = {
+static const struct intel_gvt_gtt_gma_ops gen8_gtt_gma_ops = {
 	.gma_to_ggtt_pte_index = gma_to_ggtt_pte_index,
 	.gma_to_pte_index = gen8_gma_to_pte_index,
 	.gma_to_pde_index = gen8_gma_to_pde_index,
@@ -2097,7 +2097,7 @@ unsigned long intel_vgpu_gma_to_gpa(struct intel_vgpu_mm *mm, unsigned long gma)
 	struct intel_vgpu *vgpu = mm->vgpu;
 	struct intel_gvt *gvt = vgpu->gvt;
 	struct intel_gvt_gtt_pte_ops *pte_ops = gvt->gtt.pte_ops;
-	struct intel_gvt_gtt_gma_ops *gma_ops = gvt->gtt.gma_ops;
+	const struct intel_gvt_gtt_gma_ops *gma_ops = gvt->gtt.gma_ops;
 	unsigned long gpa = INTEL_GVT_INVALID_ADDR;
 	unsigned long gma_index[4];
 	struct intel_gvt_gtt_entry e;
diff --git a/drivers/gpu/drm/i915/gvt/gtt.h b/drivers/gpu/drm/i915/gvt/gtt.h
index 3bf45672ef98..d0d598322404 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.h
+++ b/drivers/gpu/drm/i915/gvt/gtt.h
@@ -92,7 +92,7 @@ struct intel_gvt_gtt_gma_ops {
 
 struct intel_gvt_gtt {
 	struct intel_gvt_gtt_pte_ops *pte_ops;
-	struct intel_gvt_gtt_gma_ops *gma_ops;
+	const struct intel_gvt_gtt_gma_ops *gma_ops;
 	int (*mm_alloc_page_table)(struct intel_vgpu_mm *mm);
 	void (*mm_free_page_table)(struct intel_vgpu_mm *mm);
 	struct list_head oos_page_use_list_head;
-- 
2.34.1