linux-kernel - Re: [PATCH] drm/amdkfd: simplify svm_range_unmap_from

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <b07fe002-704d-4c26-aa09-6f7116d5c53b@amd.com>
Date: Tue, 20 Jan 2026 18:15:38 -0500
From: Felix Kuehling <felix.kuehling@....com>
To: Yury Norov <ynorov@...dia.com>, Alex Deucher <alexander.deucher@....com>,
 Christian König <christian.koenig@....com>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amdkfd: simplify svm_range_unmap_from_gpus()

On 2026-01-14 11:05, Yury Norov wrote:
> The function calls bitmap_or() followed by for_each_set_bit().
> Switch it to the dedicated for_each_or_bit() and drop the temporary
> bitmap.
>
> Signed-off-by: Yury Norov <ynorov@...dia.com>

The patch is

Reviewed-by: Felix Kuehling <felix.kuehling@....com>

I'm applying it to amd-staging-drm-next.

Thanks,
   Felix


> ---
>   drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> index 79ea138897fc..eed76b13d191 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> @@ -1344,7 +1344,6 @@ static int
>   svm_range_unmap_from_gpus(struct svm_range *prange, unsigned long start,
>   			  unsigned long last, uint32_t trigger)
>   {
> -	DECLARE_BITMAP(bitmap, MAX_GPU_INSTANCE);
>   	struct kfd_process_device *pdd;
>   	struct dma_fence *fence = NULL;
>   	struct kfd_process *p;
> @@ -1362,11 +1361,9 @@ svm_range_unmap_from_gpus(struct svm_range *prange, unsigned long start,
>   		prange->mapped_to_gpu = false;
>   	}
>   
> -	bitmap_or(bitmap, prange->bitmap_access, prange->bitmap_aip,
> -		  MAX_GPU_INSTANCE);
>   	p = container_of(prange->svms, struct kfd_process, svms);
>   
> -	for_each_set_bit(gpuidx, bitmap, MAX_GPU_INSTANCE) {
> +	for_each_or_bit(gpuidx, prange->bitmap_access, prange->bitmap_aip, MAX_GPU_INSTANCE) {
>   		pr_debug("unmap from gpu idx 0x%x\n", gpuidx);
>   		pdd = kfd_process_device_from_gpuidx(p, gpuidx);
>   		if (!pdd) {