linux-kernel - [PATCH] drm/msm/a6xx: use __always_unused to fix compiler warnings for gen7

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Date: Tue, 4 Jun 2024 14:51:04 -0700
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: <freedreno@...ts.freedesktop.org>, Rob Clark <robdclark@...il.com>,
        "Sean
 Paul" <sean@...rly.run>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "Abhinav
 Kumar" <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, "Daniel
 Vetter" <daniel@...ll.ch>,
        Connor Abbott <cwabbott0@...il.com>
CC: <dri-devel@...ts.freedesktop.org>, <seanpaul@...omium.org>,
        <quic_jesszhan@...cinc.com>, Rob Clark <robdclark@...omium.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm/msm/a6xx: use __always_unused to fix compiler warnings for gen7_* includes

GCC diagnostic pragma method throws below warnings in some of the versions

drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:16:9: warning: unknown option after '#pragma GCC diagnostic' kind [-Wpragmas]
 #pragma GCC diagnostic ignored "-Wunused-const-variable"
         ^
In file included from drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:18:0:
drivers/gpu/drm/msm/adreno/adreno_gen7_0_0_snapshot.h:924:19: warning: 'gen7_0_0_external_core_regs__always_unused' defined but not used [-Wunused-variable]
 static const u32 *gen7_0_0_external_core_regs__always_unused[] = {
                   ^
In file included from drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:19:0:
drivers/gpu/drm/msm/adreno/adreno_gen7_2_0_snapshot.h:748:19: warning: 'gen7_2_0_external_core_regs' defined but not used [-Wunused-variable]
 static const u32 *gen7_2_0_external_core_regs[] = {
                   ^
In file included from drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c:20:0:
drivers/gpu/drm/msm/adreno/adreno_gen7_9_0_snapshot.h:1188:43: warning: 'gen7_9_0_sptp_clusters' defined but not used [-Wunused-variable]
 static struct gen7_sptp_cluster_registers gen7_9_0_sptp_clusters[] = {
                                           ^
drivers/gpu/drm/msm/adreno/adreno_gen7_9_0_snapshot.h:1438:19: warning: 'gen7_9_0_external_core_regs' defined but not used [-Wunused-variable]
 static const u32 *gen7_9_0_external_core_regs[] = {

Remove GCC dependency by using __always_unused for the unused gen7_* includes.

Fixes: 64d6255650d4 ("drm/msm: More fully implement devcoredump for a7xx")
Suggested-by: Rob Clark <robdclark@...omium.org>
Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
---
 drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
index 0a7717a4fc2f..62ca0cf24005 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c
@@ -8,19 +8,10 @@
 #include "a6xx_gpu_state.h"
 #include "a6xx_gmu.xml.h"
 
-/* Ignore diagnostics about register tables that we aren't using yet. We don't
- * want to modify these headers too much from their original source.
- */
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-variable"
-#pragma GCC diagnostic ignored "-Wunused-const-variable"
-
 #include "adreno_gen7_0_0_snapshot.h"
 #include "adreno_gen7_2_0_snapshot.h"
 #include "adreno_gen7_9_0_snapshot.h"
 
-#pragma GCC diagnostic pop
-
 struct a6xx_gpu_state_obj {
 	const void *handle;
 	u32 *data;
@@ -1350,6 +1341,10 @@ static void a7xx_get_registers(struct msm_gpu *gpu,
 	int index = 0;
 	const u32 *pre_crashdumper_regs;
 	const struct gen7_reg_list *reglist;
+	__always_unused const u32 **external_core_regs7_0_0 = gen7_0_0_external_core_regs;
+	__always_unused const u32 **external_core_regs_7_2_0 = gen7_2_0_external_core_regs;
+	__always_unused const u32 **external_core_regs_7_9_0 = gen7_9_0_external_core_regs;
+	__always_unused struct gen7_sptp_cluster_registers *sptp_gen7 = gen7_9_0_sptp_clusters;
 
 	if (adreno_is_a730(adreno_gpu)) {
 		reglist = gen7_0_0_reg_list;
-- 
2.44.0