linux-kernel - Re: [PATCH 1/2] drm/amdkfd: Use bitmap

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Message-ID: <80a426b3-ece2-129c-edca-03556e1ecbb6@wanadoo.fr>
Date:   Tue, 26 Apr 2022 20:47:20 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Felix Kuehling <felix.kuehling@....com>, alexander.deucher@....com,
        christian.koenig@....com, Xinhui.Pan@....com, airlied@...ux.ie,
        daniel@...ll.ch
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/2] drm/amdkfd: Use bitmap_zalloc() when applicable

Le 26/04/2022 à 20:01, Felix Kuehling a écrit :
> Hi Christophe,
> 
> I just stumbled over this patch series while cleaning up my inbox. Sorry 
> for dropping it back in November. I'm about to apply it but I noticed 
> that patch 1 is missing a Signed-off-by. Is it OK to add that in your name?

Hi,

No problem for me if you can add it. Thanks.
But if you prefer a v2, it is also fine for me.

BTW sorry for missing the SoB tag. This definitively means that I forgot 
the checkpatch.pl step for this patch, which is bad.

CJ

> 
> Thanks,
>    Felix
> 
> 
> Am 2021-11-28 um 11:45 schrieb Christophe JAILLET:
>> 'kfd->gtt_sa_bitmap' is a bitmap. So use 'bitmap_zalloc()' to simplify
>> code, improve the semantic and avoid some open-coded arithmetic in
>> allocator arguments.
>>
>> Also change the corresponding 'kfree()' into 'bitmap_free()' to keep
>> consistency.
>> ---
>>   drivers/gpu/drm/amd/amdkfd/kfd_device.c | 12 +++---------
>>   1 file changed, 3 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c 
>> b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
>> index e1294fba0c26..c5a0ce44a295 100644
>> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
>> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
>> @@ -1252,8 +1252,6 @@ int 
>> kgd2kfd_schedule_evict_and_restore_process(struct mm_struct *mm,
>>   static int kfd_gtt_sa_init(struct kfd_dev *kfd, unsigned int buf_size,
>>                   unsigned int chunk_size)
>>   {
>> -    unsigned int num_of_longs;
>> -
>>       if (WARN_ON(buf_size < chunk_size))
>>           return -EINVAL;
>>       if (WARN_ON(buf_size == 0))
>> @@ -1264,11 +1262,8 @@ static int kfd_gtt_sa_init(struct kfd_dev *kfd, 
>> unsigned int buf_size,
>>       kfd->gtt_sa_chunk_size = chunk_size;
>>       kfd->gtt_sa_num_of_chunks = buf_size / chunk_size;
>> -    num_of_longs = (kfd->gtt_sa_num_of_chunks + BITS_PER_LONG - 1) /
>> -        BITS_PER_LONG;
>> -
>> -    kfd->gtt_sa_bitmap = kcalloc(num_of_longs, sizeof(long), 
>> GFP_KERNEL);
>> -
>> +    kfd->gtt_sa_bitmap = bitmap_zalloc(kfd->gtt_sa_num_of_chunks,
>> +                       GFP_KERNEL);
>>       if (!kfd->gtt_sa_bitmap)
>>           return -ENOMEM;
>> @@ -1278,13 +1273,12 @@ static int kfd_gtt_sa_init(struct kfd_dev 
>> *kfd, unsigned int buf_size,
>>       mutex_init(&kfd->gtt_sa_lock);
>>       return 0;
>> -
>>   }
>>   static void kfd_gtt_sa_fini(struct kfd_dev *kfd)
>>   {
>>       mutex_destroy(&kfd->gtt_sa_lock);
>> -    kfree(kfd->gtt_sa_bitmap);
>> +    bitmap_free(kfd->gtt_sa_bitmap);
>>   }
>>   static inline uint64_t kfd_gtt_sa_calc_gpu_addr(uint64_t start_addr,
>