linux-kernel - Re: [PATCH v5 2/3] memremap: rename MEMORY_DEVICE_DEVDAX to MEMORY_DEVICE

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Message-ID: <CAM9Jb+g3=CbEC1QqdZj6ZqXZ78JsnrjPPV6+ATw7ewSCfa3b4w@mail.gmail.com>
Date:   Tue, 1 Sep 2020 10:54:56 +0200
From:   Pankaj Gupta <pankaj.gupta.linux@...il.com>
To:     Roger Pau Monne <roger.pau@...rix.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Dave Jiang <dave.jiang@...el.com>, Jason Gunthorpe <jgg@...pe.ca>,
        Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>, Johannes Thumshirn
        <jthumshirn@...e.de>, Logan Gunthorpe" <logang@...tatee.com>,
        Juergen Gross <jgross@...e.com>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        xen-devel@...ts.xenproject.org, Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH v5 2/3] memremap: rename MEMORY_DEVICE_DEVDAX to MEMORY_DEVICE_GENERIC

> This is in preparation for the logic behind MEMORY_DEVICE_DEVDAX also
> being used by non DAX devices.
>
> No functional change intended.
>
> Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>
> Reviewed-by: Ira Weiny <ira.weiny@...el.com>
> Acked-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Vishal Verma <vishal.l.verma@...el.com>
> Cc: Dave Jiang <dave.jiang@...el.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Jason Gunthorpe <jgg@...pe.ca>
> Cc: Ira Weiny <ira.weiny@...el.com>
> Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
> Cc: Johannes Thumshirn <jthumshirn@...e.de>
> Cc: Logan Gunthorpe <logang@...tatee.com>
> Cc: Juergen Gross <jgross@...e.com>
> Cc: linux-nvdimm@...ts.01.org
> Cc: xen-devel@...ts.xenproject.org
> Cc: linux-mm@...ck.org
> ---
>  drivers/dax/device.c     | 2 +-
>  include/linux/memremap.h | 9 ++++-----
>  mm/memremap.c            | 2 +-
>  3 files changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/dax/device.c b/drivers/dax/device.c
> index 4c0af2eb7e19..1e89513f3c59 100644
> --- a/drivers/dax/device.c
> +++ b/drivers/dax/device.c
> @@ -429,7 +429,7 @@ int dev_dax_probe(struct device *dev)
>                 return -EBUSY;
>         }
>
> -       dev_dax->pgmap.type = MEMORY_DEVICE_DEVDAX;
> +       dev_dax->pgmap.type = MEMORY_DEVICE_GENERIC;
>         addr = devm_memremap_pages(dev, &dev_dax->pgmap);
>         if (IS_ERR(addr))
>                 return PTR_ERR(addr);
> diff --git a/include/linux/memremap.h b/include/linux/memremap.h
> index 5f5b2df06e61..e5862746751b 100644
> --- a/include/linux/memremap.h
> +++ b/include/linux/memremap.h
> @@ -46,11 +46,10 @@ struct vmem_altmap {
>   * wakeup is used to coordinate physical address space management (ex:
>   * fs truncate/hole punch) vs pinned pages (ex: device dma).
>   *
> - * MEMORY_DEVICE_DEVDAX:
> + * MEMORY_DEVICE_GENERIC:
>   * Host memory that has similar access semantics as System RAM i.e. DMA
> - * coherent and supports page pinning. In contrast to
> - * MEMORY_DEVICE_FS_DAX, this memory is access via a device-dax
> - * character device.
> + * coherent and supports page pinning. This is for example used by DAX devices
> + * that expose memory using a character device.
>   *
>   * MEMORY_DEVICE_PCI_P2PDMA:
>   * Device memory residing in a PCI BAR intended for use with Peer-to-Peer
> @@ -60,7 +59,7 @@ enum memory_type {
>         /* 0 is reserved to catch uninitialized type fields */
>         MEMORY_DEVICE_PRIVATE = 1,
>         MEMORY_DEVICE_FS_DAX,
> -       MEMORY_DEVICE_DEVDAX,
> +       MEMORY_DEVICE_GENERIC,
>         MEMORY_DEVICE_PCI_P2PDMA,
>  };
>
> diff --git a/mm/memremap.c b/mm/memremap.c
> index 03e38b7a38f1..006dace60b1a 100644
> --- a/mm/memremap.c
> +++ b/mm/memremap.c
> @@ -216,7 +216,7 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
>                         return ERR_PTR(-EINVAL);
>                 }
>                 break;
> -       case MEMORY_DEVICE_DEVDAX:
> +       case MEMORY_DEVICE_GENERIC:
>                 need_devmap_managed = false;
>                 break;
>         case MEMORY_DEVICE_PCI_P2PDMA:

Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@...il.com>