[PATCH -next 0/3] drm: use clamp() instead of min(max())

[PATCH -next 0/3] drm: use clamp() instead of min(max())

[Li Zetao]

Hi,

When it needs to get the value of a certain interval [min, max],
it is easier to understand using clamp(x, min, max) instead of
min(max(x, min), max). What needs to be determined is that min
should be smaller than max.

Li Zetao (3):
  drm/amd: use clamp() in amdgpu_pll_get_fb_ref_div()
  drm/amdgpu: use clamp() in amdgpu_vm_adjust_size()
  drm/amdgpu: use clamp() in nvkm_volt_map()

 drivers/gpu/drm/amd/amdgpu/amdgpu_pll.c         | 2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c          | 2 +-
 drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

-- 
2.34.1

[PATCH -next 1/3] drm/amd: use clamp() in amdgpu_pll_get_fb_ref_div()

[Li Zetao]

When it needs to get a value within a certain interval, using clamp()
makes the code easier to understand than min(max()).

Signed-off-by: Li Zetao <lizetao1@huawei.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_pll.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pll.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pll.c
index 0bb2466d539a..675aa138ea11 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pll.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pll.c
@@ -94,7 +94,7 @@ static void amdgpu_pll_get_fb_ref_div(struct amdgpu_device *adev, unsigned int n
 		ref_div_max = min(128 / post_div, ref_div_max);
 
 	/* get matching reference and feedback divider */
-	*ref_div = min(max(DIV_ROUND_CLOSEST(den, post_div), 1u), ref_div_max);
+	*ref_div = clamp(DIV_ROUND_CLOSEST(den, post_div), 1u, ref_div_max);
 	*fb_div = DIV_ROUND_CLOSEST(nom * *ref_div * post_div, den);
 
 	/* limit fb divider to its maximum */
-- 
2.34.1

[PATCH -next 2/3] drm/amdgpu: use clamp() in amdgpu_vm_adjust_size()

[Li Zetao]

When it needs to get a value within a certain interval, using clamp()
makes the code easier to understand than min(max()).

Signed-off-by: Li Zetao <lizetao1@huawei.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index e20d19ae01b2..40f9a5d4f3c0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2224,7 +2224,7 @@ void amdgpu_vm_adjust_size(struct amdgpu_device *adev, uint32_t min_vm_size,
 		phys_ram_gb = ((uint64_t)si.totalram * si.mem_unit +
 			       (1 << 30) - 1) >> 30;
 		vm_size = roundup_pow_of_two(
-			min(max(phys_ram_gb * 3, min_vm_size), max_size));
+			clamp(phys_ram_gb * 3, min_vm_size, max_size));
 	}
 
 	adev->vm_manager.max_pfn = (uint64_t)vm_size << 18;
-- 
2.34.1

Re: [PATCH -next 2/3] drm/amdgpu: use clamp() in amdgpu_vm_adjust_size()

[Christian König]

Am 30.08.24 um 03:22 schrieb Li Zetao:
> When it needs to get a value within a certain interval, using clamp()
> makes the code easier to understand than min(max()).
>
> Signed-off-by: Li Zetao <lizetao1@huawei.com>

This patch and #1 is a nice cleanup and Reviewed-by: Christian König 
<christian.koenig@amd.com>

But as Alex also pointed out patch #3 is for Nouveau and not amdgpu.

Regards,
Christian.


> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index e20d19ae01b2..40f9a5d4f3c0 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -2224,7 +2224,7 @@ void amdgpu_vm_adjust_size(struct amdgpu_device *adev, uint32_t min_vm_size,
>   		phys_ram_gb = ((uint64_t)si.totalram * si.mem_unit +
>   			       (1 << 30) - 1) >> 30;
>   		vm_size = roundup_pow_of_two(
> -			min(max(phys_ram_gb * 3, min_vm_size), max_size));
> +			clamp(phys_ram_gb * 3, min_vm_size, max_size));
>   	}
>   
>   	adev->vm_manager.max_pfn = (uint64_t)vm_size << 18;

Re: [PATCH -next 2/3] drm/amdgpu: use clamp() in amdgpu_vm_adjust_size()

[Alex Deucher]

Applied amdgpu patches.  Thanks!

On Fri, Aug 30, 2024 at 10:19 AM Christian König
<christian.koenig@amd.com> wrote:
>
> Am 30.08.24 um 03:22 schrieb Li Zetao:
> > When it needs to get a value within a certain interval, using clamp()
> > makes the code easier to understand than min(max()).
> >
> > Signed-off-by: Li Zetao <lizetao1@huawei.com>
>
> This patch and #1 is a nice cleanup and Reviewed-by: Christian König
> <christian.koenig@amd.com>
>
> But as Alex also pointed out patch #3 is for Nouveau and not amdgpu.
>
> Regards,
> Christian.
>
>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> > index e20d19ae01b2..40f9a5d4f3c0 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> > @@ -2224,7 +2224,7 @@ void amdgpu_vm_adjust_size(struct amdgpu_device *adev, uint32_t min_vm_size,
> >               phys_ram_gb = ((uint64_t)si.totalram * si.mem_unit +
> >                              (1 << 30) - 1) >> 30;
> >               vm_size = roundup_pow_of_two(
> > -                     min(max(phys_ram_gb * 3, min_vm_size), max_size));
> > +                     clamp(phys_ram_gb * 3, min_vm_size, max_size));
> >       }
> >
> >       adev->vm_manager.max_pfn = (uint64_t)vm_size << 18;
>

[PATCH -next 3/3] drm/amdgpu: use clamp() in nvkm_volt_map()

[Li Zetao]

When it needs to get a value within a certain interval, using clamp()
makes the code easier to understand than min(max()).

Signed-off-by: Li Zetao <lizetao1@huawei.com>
---
 drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
index a17a6dd8d3de..803b98df4858 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
@@ -142,7 +142,7 @@ nvkm_volt_map(struct nvkm_volt *volt, u8 id, u8 temp)
 			return -ENODEV;
 		}
 
-		result = min(max(result, (s64)info.min), (s64)info.max);
+		result = clamp(result, (s64)info.min, (s64)info.max);
 
 		if (info.link != 0xff) {
 			int ret = nvkm_volt_map(volt, info.link, temp);
-- 
2.34.1

Re: [PATCH -next 3/3] drm/amdgpu: use clamp() in nvkm_volt_map()

[Alex Deucher]

The patch title prefix should say drm/nouveau.

Alex

On Fri, Aug 30, 2024 at 3:15 AM Li Zetao <lizetao1@huawei.com> wrote:
>
> When it needs to get a value within a certain interval, using clamp()
> makes the code easier to understand than min(max()).
>
> Signed-off-by: Li Zetao <lizetao1@huawei.com>
> ---
>  drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
> index a17a6dd8d3de..803b98df4858 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
> @@ -142,7 +142,7 @@ nvkm_volt_map(struct nvkm_volt *volt, u8 id, u8 temp)
>                         return -ENODEV;
>                 }
>
> -               result = min(max(result, (s64)info.min), (s64)info.max);
> +               result = clamp(result, (s64)info.min, (s64)info.max);
>
>                 if (info.link != 0xff) {
>                         int ret = nvkm_volt_map(volt, info.link, temp);
> --
> 2.34.1
>

Re: [PATCH -next 3/3] drm/amdgpu: use clamp() in nvkm_volt_map()

[Lyude Paul]

As long as you make sure to fix the patch name from drm/amdgpu to drm/nouveau
like Alex mentioned:

Reviewed-by: Lyude Paul <lyude@redhat.com>

On Fri, 2024-08-30 at 09:22 +0800, Li Zetao wrote:
> When it needs to get a value within a certain interval, using clamp()
> makes the code easier to understand than min(max()).
> 
> Signed-off-by: Li Zetao <lizetao1@huawei.com>
> ---
>  drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
> index a17a6dd8d3de..803b98df4858 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/base.c
> @@ -142,7 +142,7 @@ nvkm_volt_map(struct nvkm_volt *volt, u8 id, u8 temp)
>  			return -ENODEV;
>  		}
>  
> -		result = min(max(result, (s64)info.min), (s64)info.max);
> +		result = clamp(result, (s64)info.min, (s64)info.max);
>  
>  		if (info.link != 0xff) {
>  			int ret = nvkm_volt_map(volt, info.link, temp);

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat

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