linux-kernel - Re: [PATCH v6] sun4i-emac.c: add dma support

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Message-ID: <202201071532.57A08030@keescook>
Date:   Fri, 7 Jan 2022 15:34:18 -0800
From:   Kees Cook <keescook@...omium.org>
To:     conleylee@...mail.com
Cc:     davem@...emloft.net, kuba@...nel.org, mripard@...nel.org,
        wens@...e.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] sun4i-emac.c: add dma support

On Wed, Dec 29, 2021 at 09:43:51AM +0800, conleylee@...mail.com wrote:
> From: Conley Lee <conleylee@...mail.com>
>
> Thanks for your review. Here is the new version for this patch.
>
> This patch adds support for the emac rx dma present on sun4i. The emac
> is able to move packets from rx fifo to RAM by using dma.
>
> Change since v4.
>   - rename sbk field to skb
>   - rename alloc_emac_dma_req to emac_alloc_dma_req
>   - using kzalloc(..., GPF_ATOMIC) in interrupt context to avoid
>     sleeping
>   - retry by using emac_inblk_32bit when emac_dma_inblk_32bit fails
>   - fix some code style issues
>
> Change since v5.
>   - fix some code style issue
>
> Signed-off-by: Conley Lee <conleylee@...mail.com>
> ---
>  drivers/net/ethernet/allwinner/sun4i-emac.c | 200 ++++++++++++++++++++
>  1 file changed, 200 insertions(+)

This is causing build failures:

$ make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 allmodconfig
$ make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 -j... -k -s
drivers/net/ethernet/allwinner/sun4i-emac.c: In function 'emac_configure_dma':
drivers/net/ethernet/allwinner/sun4i-emac.c:922:60: error: format '%x' expects argument of type 'unsigned int', but argument 3 has type 'resource_size_t' {aka 'long long unsigned int'} [-Werror=format=]
  922 |         netdev_info(ndev, "get io resource from device: 0x%x, size = %u\n",
      |                                                           ~^
      |                                                            |                                      |                                                            unsigned int
      |                                                           %llx
  923 |                     regs->start, resource_size(regs));
      |                     ~~~~~~~~~~~
      |                         |
      |                         resource_size_t {aka long long unsigned int}
drivers/net/ethernet/allwinner/sun4i-emac.c:922:71: error: format '%u' expects argument of type 'unsigned int', but argument 4 has type 'resource_size_t' {aka 'long long unsigned int'} [-Werror=format=]
  922 |         netdev_info(ndev, "get io resource from device: 0x%x, size = %u\n",
      |                                                                      ~^
      |                                                                       |
      |                                                                       unsigned int
      |                                                                      %llu
  923 |                     regs->start, resource_size(regs));
      |                                  ~~~~~~~~~~~~~~~~~~~
      |                                  |
      |                                  resource_size_t {aka long long unsigned int}


--
Kees Cook