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Message-ID: <20251016065117.2797-1-yangtiezhu@loongson.cn>
Date: Thu, 16 Oct 2025 14:51:17 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
Harry Wentland <harry.wentland@....com>,
Leo Li <sunpeng.li@....com>
Cc: amd-gfx@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v1] drm/amd: Fix set but not used warnings
There are many set but not used warnings under drivers/gpu/drm/amd when
compiling with the latest upstream mainline GCC:
drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c:305:18: warning: variable ‘p’ set but not used [-Wunused-but-set-variable=]
drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.h:103:26: warning: variable ‘internal_reg_offset’ set but not used [-Wunused-but-set-variable=]
...
drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.h:164:26: warning: variable ‘internal_reg_offset’ set but not used [-Wunused-but-set-variable=]
...
drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:445:13: warning: variable ‘pipe_idx’ set but not used [-Wunused-but-set-variable=]
drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:875:21: warning: variable ‘pipe_idx’ set but not used [-Wunused-but-set-variable=]
Remove the variables actually not used or add __maybe_unused attribute for
the variables actually used to fix them, compile tested only.
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c | 4 +---
drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.h | 6 ++++--
drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c | 9 +++------
3 files changed, 8 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
index b2033f8352f5..83f3b94ed975 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
@@ -302,7 +302,6 @@ void amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
int pages)
{
unsigned t;
- unsigned p;
int i, j;
u64 page_base;
/* Starting from VEGA10, system bit must be 0 to mean invalid. */
@@ -316,8 +315,7 @@ void amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
return;
t = offset / AMDGPU_GPU_PAGE_SIZE;
- p = t / AMDGPU_GPU_PAGES_IN_CPU_PAGE;
- for (i = 0; i < pages; i++, p++) {
+ for (i = 0; i < pages; i++) {
page_base = adev->dummy_page_addr;
if (!adev->gart.ptr)
continue;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.h
index dc8a17bcc3c8..82624b44e661 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.h
@@ -100,7 +100,8 @@
#define SOC15_DPG_MODE_OFFSET(ip, inst_idx, reg) \
({ \
- uint32_t internal_reg_offset, addr; \
+ /* To avoid a -Wunused-but-set-variable warning. */ \
+ uint32_t internal_reg_offset __maybe_unused, addr; \
bool video_range, video1_range, aon_range, aon1_range; \
\
addr = (adev->reg_offset[ip##_HWIP][inst_idx][reg##_BASE_IDX] + reg); \
@@ -161,7 +162,8 @@
#define SOC24_DPG_MODE_OFFSET(ip, inst_idx, reg) \
({ \
- uint32_t internal_reg_offset, addr; \
+ /* To avoid a -Wunused-but-set-variable warning. */ \
+ uint32_t internal_reg_offset __maybe_unused, addr; \
bool video_range, video1_range, aon_range, aon1_range; \
\
addr = (adev->reg_offset[ip##_HWIP][inst_idx][reg##_BASE_IDX] + reg); \
diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
index 53a088ebddef..6518d5639d66 100644
--- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
+++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c
@@ -442,7 +442,6 @@ bool dc_dmub_srv_p_state_delegate(struct dc *dc, bool should_manage_pstate, stru
int i = 0, k = 0;
int ramp_up_num_steps = 1; // TODO: Ramp is currently disabled. Reenable it.
uint8_t visual_confirm_enabled;
- int pipe_idx = 0;
struct dc_stream_status *stream_status = NULL;
if (dc == NULL)
@@ -457,7 +456,7 @@ bool dc_dmub_srv_p_state_delegate(struct dc *dc, bool should_manage_pstate, stru
cmd.fw_assisted_mclk_switch.config_data.visual_confirm_enabled = visual_confirm_enabled;
if (should_manage_pstate) {
- for (i = 0, pipe_idx = 0; i < dc->res_pool->pipe_count; i++) {
+ for (i = 0; i < dc->res_pool->pipe_count; i++) {
struct pipe_ctx *pipe = &context->res_ctx.pipe_ctx[i];
if (!pipe->stream)
@@ -472,7 +471,6 @@ bool dc_dmub_srv_p_state_delegate(struct dc *dc, bool should_manage_pstate, stru
cmd.fw_assisted_mclk_switch.config_data.vactive_stretch_margin_us = dc->debug.fpo_vactive_margin_us;
break;
}
- pipe_idx++;
}
}
@@ -872,7 +870,7 @@ void dc_dmub_setup_subvp_dmub_command(struct dc *dc,
bool enable)
{
uint8_t cmd_pipe_index = 0;
- uint32_t i, pipe_idx;
+ uint32_t i;
uint8_t subvp_count = 0;
union dmub_rb_cmd cmd;
struct pipe_ctx *subvp_pipes[2];
@@ -899,7 +897,7 @@ void dc_dmub_setup_subvp_dmub_command(struct dc *dc,
if (enable) {
// For each pipe that is a "main" SUBVP pipe, fill in pipe data for DMUB SUBVP cmd
- for (i = 0, pipe_idx = 0; i < dc->res_pool->pipe_count; i++) {
+ for (i = 0; i < dc->res_pool->pipe_count; i++) {
struct pipe_ctx *pipe = &context->res_ctx.pipe_ctx[i];
pipe_mall_type = dc_state_get_pipe_subvp_type(context, pipe);
@@ -922,7 +920,6 @@ void dc_dmub_setup_subvp_dmub_command(struct dc *dc,
populate_subvp_cmd_vblank_pipe_info(dc, context, &cmd, pipe, cmd_pipe_index++);
}
- pipe_idx++;
}
if (subvp_count == 2) {
update_subvp_prefetch_end_to_mall_start(dc, context, &cmd, subvp_pipes);
--
2.42.0
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