linux-kernel - Re: [PATCH 5/7] mm/hmm: use a structure for update callback parameters

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Date:   Fri, 31 Aug 2018 09:11:48 +1000
From:   Balbir Singh <bsingharora@...il.com>
To:     jglisse@...hat.com
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Ralph Campbell <rcampbell@...dia.com>,
        John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH 5/7] mm/hmm: use a structure for update callback
 parameters

On Fri, Aug 24, 2018 at 03:25:47PM -0400, jglisse@...hat.com wrote:
> From: Jérôme Glisse <jglisse@...hat.com>
> 
> Use a structure to gather all the parameters for the update callback.
> This make it easier when adding new parameters by avoiding having to
> update all callback function signature.
> 
> Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
> Cc: Ralph Campbell <rcampbell@...dia.com>
> Cc: John Hubbard <jhubbard@...dia.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> ---
>  include/linux/hmm.h | 25 +++++++++++++++++--------
>  mm/hmm.c            | 27 ++++++++++++++-------------
>  2 files changed, 31 insertions(+), 21 deletions(-)
> 
> diff --git a/include/linux/hmm.h b/include/linux/hmm.h
> index 1ff4bae7ada7..a7f7600b6bb0 100644
> --- a/include/linux/hmm.h
> +++ b/include/linux/hmm.h
> @@ -274,13 +274,26 @@ static inline uint64_t hmm_pfn_from_pfn(const struct hmm_range *range,
>  struct hmm_mirror;
>  
>  /*
> - * enum hmm_update_type - type of update
> + * enum hmm_update_event - type of update
>   * @HMM_UPDATE_INVALIDATE: invalidate range (no indication as to why)
>   */
> -enum hmm_update_type {
> +enum hmm_update_event {
>  	HMM_UPDATE_INVALIDATE,
>  };
>  
> +/*
> + * struct hmm_update - HMM update informations for callback
> + *
> + * @start: virtual start address of the range to update
> + * @end: virtual end address of the range to update
> + * @event: event triggering the update (what is happening)
> + */
> +struct hmm_update {
> +	unsigned long start;
> +	unsigned long end;
> +	enum hmm_update_event event;
> +};
> +

I wonder if you want to add further information about the range,
like page_size, I guess the other side does not care about the
size. Do we care about sending multiple discontig ranges in
hmm_update? Should it be an array?

Balbir Singh