linux-kernel - Re: [PATCH v2] swiotlb-xen: Convert to use macro

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Message-ID: <CAFqt6zYkFk55gzmfwMFzpWiOp0xP3DXdmWyO2Ce8+mqYW12SNw@mail.gmail.com>
Date:   Fri, 6 Sep 2019 17:57:19 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     konrad.wilk@...cle.com,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>, sstabellini@...nel.org
Cc:     xen-devel@...ts.xenproject.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        Sabyasachi Gupta <sabyasachi.linux@...il.com>
Subject: Re: [PATCH v2] swiotlb-xen: Convert to use macro

On Mon, Sep 2, 2019 at 2:04 PM Souptick Joarder <jrdr.linux@...il.com> wrote:
>
> Rather than using static int max_dma_bits, this
> can be coverted to use as macro.
>
> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
> Reviewed-by: Juergen Gross <jgross@...e.com>

If it is still not late, can we get this patch in queue for 5.4 ?

> ---
>  drivers/xen/swiotlb-xen.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
> index ae1df49..d1eced5 100644
> --- a/drivers/xen/swiotlb-xen.c
> +++ b/drivers/xen/swiotlb-xen.c
> @@ -38,6 +38,7 @@
>  #include <asm/xen/page-coherent.h>
>
>  #include <trace/events/swiotlb.h>
> +#define MAX_DMA_BITS 32
>  /*
>   * Used to do a quick range check in swiotlb_tbl_unmap_single and
>   * swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this
> @@ -114,8 +115,6 @@ static int is_xen_swiotlb_buffer(dma_addr_t dma_addr)
>         return 0;
>  }
>
> -static int max_dma_bits = 32;
> -
>  static int
>  xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
>  {
> @@ -135,7 +134,7 @@ static int is_xen_swiotlb_buffer(dma_addr_t dma_addr)
>                                 p + (i << IO_TLB_SHIFT),
>                                 get_order(slabs << IO_TLB_SHIFT),
>                                 dma_bits, &dma_handle);
> -               } while (rc && dma_bits++ < max_dma_bits);
> +               } while (rc && dma_bits++ < MAX_DMA_BITS);
>                 if (rc)
>                         return rc;
>
> --
> 1.9.1
>