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SubjectRe: [PATCH] drm/amdgpu: Initialize shadow to false in gfx_v9_0_rlcg_wreg
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On Tue, 2020-03-17 at 17:25 -0700, Nathan Chancellor wrote:
> clang warns:
>
> drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c:754:6: warning: variable 'shadow'
> is used uninitialized whenever 'if' condition is
> false [-Wsometimes-uninitialized]
> if (offset == grbm_cntl || offset == grbm_idx)
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c:757:6: note: uninitialized use
> occurs here
> if (shadow) {
> ^~~~~~

Wouldn't it be better to get rid of the shadow variable completely?
---
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 7bc248..496b9e 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -735,7 +735,6 @@ void gfx_v9_0_rlcg_wreg(struct amdgpu_device *adev, u32 offset, u32 v)
static void *spare_int;
static uint32_t grbm_cntl;
static uint32_t grbm_idx;
- bool shadow;

scratch_reg0 = adev->rmmio + (adev->reg_offset[GC_HWIP][0][mmSCRATCH_REG0_BASE_IDX] + mmSCRATCH_REG0)*4;
scratch_reg1 = adev->rmmio + (adev->reg_offset[GC_HWIP][0][mmSCRATCH_REG1_BASE_IDX] + mmSCRATCH_REG1)*4;
@@ -751,10 +750,7 @@ void gfx_v9_0_rlcg_wreg(struct amdgpu_device *adev, u32 offset, u32 v)
return;
}

- if (offset == grbm_cntl || offset == grbm_idx)
- shadow = true;
-
- if (shadow) {
+ if (offset == grbm_cntl || offset == grbm_idx) {
if (offset == grbm_cntl)
writel(v, scratch_reg2);
else if (offset == grbm_idx)

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