linux-kernel - Re: [PATCH 10/14] mm/hmm: rename HMM_PFN_DEVICE_UNADDRESSABLE to HMM_PFN_DEVICE

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Date:   Mon, 19 Mar 2018 16:09:08 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     <jglisse@...hat.com>, <linux-mm@...ck.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>,
        Evgeny Baskakov <ebaskakov@...dia.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Mark Hairgrove <mhairgrove@...dia.com>
Subject: Re: [PATCH 10/14] mm/hmm: rename HMM_PFN_DEVICE_UNADDRESSABLE to
 HMM_PFN_DEVICE_PRIVATE

On 03/16/2018 01:35 PM, jglisse@...hat.com wrote:
> From: Jérôme Glisse <jglisse@...hat.com>
> 
> Make naming consistent accross code, DEVICE_PRIVATE is the name use
> outside HMM code so use that one.
> 
> Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
> Cc: Evgeny Baskakov <ebaskakov@...dia.com>
> Cc: Ralph Campbell <rcampbell@...dia.com>
> Cc: Mark Hairgrove <mhairgrove@...dia.com>
> Cc: John Hubbard <jhubbard@...dia.com>
> ---
>  include/linux/hmm.h | 4 ++--
>  mm/hmm.c            | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)

Seems entirely harmless. :)

Reviewed-by: John Hubbard <jhubbard@...dia.com>

> 
> diff --git a/include/linux/hmm.h b/include/linux/hmm.h
> index 6d2b6bf6da4b..78018b3e7a9f 100644
> --- a/include/linux/hmm.h
> +++ b/include/linux/hmm.h
> @@ -88,13 +88,13 @@ struct hmm;
>   *      result of vm_insert_pfn() or vm_insert_page(). Therefore, it should not
>   *      be mirrored by a device, because the entry will never have HMM_PFN_VALID
>   *      set and the pfn value is undefined.
> - * HMM_PFN_DEVICE_UNADDRESSABLE: unaddressable device memory (ZONE_DEVICE)
> + * HMM_PFN_DEVICE_PRIVATE: unaddressable device memory (ZONE_DEVICE)
>   */
>  #define HMM_PFN_VALID (1 << 0)
>  #define HMM_PFN_WRITE (1 << 1)
>  #define HMM_PFN_ERROR (1 << 2)
>  #define HMM_PFN_SPECIAL (1 << 3)
> -#define HMM_PFN_DEVICE_UNADDRESSABLE (1 << 4)
> +#define HMM_PFN_DEVICE_PRIVATE (1 << 4)
>  #define HMM_PFN_SHIFT 5
>  
>  /*
> diff --git a/mm/hmm.c b/mm/hmm.c
> index 2118e42cb838..857eec622c98 100644
> --- a/mm/hmm.c
> +++ b/mm/hmm.c
> @@ -429,7 +429,7 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
>  					pfns[i] |= HMM_PFN_WRITE;
>  				} else if (write_fault)
>  					goto fault;
> -				pfns[i] |= HMM_PFN_DEVICE_UNADDRESSABLE;
> +				pfns[i] |= HMM_PFN_DEVICE_PRIVATE;
>  			} else if (is_migration_entry(entry)) {
>  				if (hmm_vma_walk->fault) {
>  					pte_unmap(ptep);
> 

thanks,
-- 
John Hubbard
NVIDIA