linux-kernel - Re: [PATCH] drm/amdgpu_vm: fix boolean expressions

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Date:   Thu, 3 Jan 2019 19:17:14 +0000
From:   "Kuehling, Felix" <Felix.Kuehling@....com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amdgpu_vm: fix boolean expressions

On 2019-01-03 12:34 p.m., Gustavo A. R. Silva wrote:
> Fix boolean expressions by using logical AND operator '&&'
> instead of bitwise operator '&'.
>
> This issue was detected with the help of Coccinelle.
>
> Fixes: c8c5e569c5b0 ("drm/amdgpu: Consolidate visible vs. real vram check v2.")
Actually, this bug goes back further, to 9a4b7d4c769e ("drm/amdgpu: Add
vm context module param").

Anyway, the patch is Reviewed-by: Felix Kuehling <Felix.Kuehling@....com>

Regards,
  Felix


> Cc: stable@...r.kernel.org
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index e73d152659a2..4cc0d1079935 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -3006,7 +3006,7 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
>  	}
>  	DRM_DEBUG_DRIVER("VM update mode is %s\n",
>  			 vm->use_cpu_for_update ? "CPU" : "SDMA");
> -	WARN_ONCE((vm->use_cpu_for_update & !amdgpu_gmc_vram_full_visible(&adev->gmc)),
> +	WARN_ONCE((vm->use_cpu_for_update && !amdgpu_gmc_vram_full_visible(&adev->gmc)),
>  		  "CPU update of VM recommended only for large BAR system\n");
>  	vm->last_update = NULL;
>  
> @@ -3136,7 +3136,7 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm, uns
>  	vm->pte_support_ats = pte_support_ats;
>  	DRM_DEBUG_DRIVER("VM update mode is %s\n",
>  			 vm->use_cpu_for_update ? "CPU" : "SDMA");
> -	WARN_ONCE((vm->use_cpu_for_update & !amdgpu_gmc_vram_full_visible(&adev->gmc)),
> +	WARN_ONCE((vm->use_cpu_for_update && !amdgpu_gmc_vram_full_visible(&adev->gmc)),
>  		  "CPU update of VM recommended only for large BAR system\n");
>  
>  	if (vm->pasid) {