linux-kernel - Re: [PATCH] riscv: move sifive_l2

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Date:   Fri, 6 Sep 2019 15:27:44 -0700 (PDT)
From:   Paul Walmsley <paul.walmsley@...ive.com>
To:     Christoph Hellwig <hch@....de>
cc:     palmer@...ive.com, bp@...en8.de, mchehab@...nel.org,
        linux-riscv@...ts.infradead.org, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: move sifive_l2_cache.c to drivers/soc

On Sun, 18 Aug 2019, Christoph Hellwig wrote:

> The sifive_l2_cache.c is in no way related to RISC-V architecture
> memory management.  It is a little stub driver working around the fact
> that the EDAC maintainers prefer their drivers to be structured in a
> certain way that doesn't fit the SiFive SOCs.
> 
> Move the file to drivers/soc and add a Kconfig option for it, as well
> as the whole drivers/soc boilerplate for CONFIG_SOC_SIFIVE.

The code in the patch looks OK to me.  However, two topics that need 
action:

- Since the patch doesn't fix any bugs, there shouldn't be a Fixes: line.  
Please let me know whether I can drop the line locally before I apply the 
patch, or whether you'd like to resend it.

- Since the patch touches drivers/edac/Kconfig, it needs to be acked by 
the EDAC maintainers.  I've added them to this message, but I need you to 
do the work of chasing down the ack, as is standard Linux practice.

If we can get those within the next few days, I'll add it to the queue for 
v5.4-rc1.

thanks -

- Paul

> 
> Fixes: a967a289f169 ("RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs")
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  arch/riscv/mm/Makefile                                 |  1 -
>  drivers/edac/Kconfig                                   |  2 +-
>  drivers/soc/Kconfig                                    |  1 +
>  drivers/soc/Makefile                                   |  1 +
>  drivers/soc/sifive/Kconfig                             | 10 ++++++++++
>  drivers/soc/sifive/Makefile                            |  4 ++++
>  .../riscv/mm => drivers/soc/sifive}/sifive_l2_cache.c  |  0
>  7 files changed, 17 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/soc/sifive/Kconfig
>  create mode 100644 drivers/soc/sifive/Makefile
>  rename {arch/riscv/mm => drivers/soc/sifive}/sifive_l2_cache.c (100%)
> 
> diff --git a/arch/riscv/mm/Makefile b/arch/riscv/mm/Makefile
> index 74055e1d6f21..d2101d0741d4 100644
> --- a/arch/riscv/mm/Makefile
> +++ b/arch/riscv/mm/Makefile
> @@ -11,6 +11,5 @@ obj-y += extable.o
>  obj-y += ioremap.o
>  obj-y += cacheflush.o
>  obj-y += context.o
> -obj-y += sifive_l2_cache.o
>  
>  obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
> diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
> index 200c04ce5b0e..9241b3e7a050 100644
> --- a/drivers/edac/Kconfig
> +++ b/drivers/edac/Kconfig
> @@ -462,7 +462,7 @@ config EDAC_ALTERA_SDMMC
>  
>  config EDAC_SIFIVE
>  	bool "Sifive platform EDAC driver"
> -	depends on EDAC=y && RISCV
> +	depends on EDAC=y && SIFIVE_L2
>  	help
>  	  Support for error detection and correction on the SiFive SoCs.
>  
> diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
> index 833e04a7835c..1778f8c62861 100644
> --- a/drivers/soc/Kconfig
> +++ b/drivers/soc/Kconfig
> @@ -14,6 +14,7 @@ source "drivers/soc/qcom/Kconfig"
>  source "drivers/soc/renesas/Kconfig"
>  source "drivers/soc/rockchip/Kconfig"
>  source "drivers/soc/samsung/Kconfig"
> +source "drivers/soc/sifive/Kconfig"
>  source "drivers/soc/sunxi/Kconfig"
>  source "drivers/soc/tegra/Kconfig"
>  source "drivers/soc/ti/Kconfig"
> diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
> index 2ec355003524..8b49d782a1ab 100644
> --- a/drivers/soc/Makefile
> +++ b/drivers/soc/Makefile
> @@ -20,6 +20,7 @@ obj-y				+= qcom/
>  obj-y				+= renesas/
>  obj-$(CONFIG_ARCH_ROCKCHIP)	+= rockchip/
>  obj-$(CONFIG_SOC_SAMSUNG)	+= samsung/
> +obj-$(CONFIG_SOC_SIFIVE)	+= sifive/
>  obj-y				+= sunxi/
>  obj-$(CONFIG_ARCH_TEGRA)	+= tegra/
>  obj-y				+= ti/
> diff --git a/drivers/soc/sifive/Kconfig b/drivers/soc/sifive/Kconfig
> new file mode 100644
> index 000000000000..9ffb2e8a48cd
> --- /dev/null
> +++ b/drivers/soc/sifive/Kconfig
> @@ -0,0 +1,10 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +if SOC_SIFIVE
> +
> +config SIFIVE_L2
> +	tristate "Sifive L2 Cache controller"
> +	help
> +	  Support for the L2 cache controller on SiFive platforms.
> +
> +endif
> diff --git a/drivers/soc/sifive/Makefile b/drivers/soc/sifive/Makefile
> new file mode 100644
> index 000000000000..9b4a85558347
> --- /dev/null
> +++ b/drivers/soc/sifive/Makefile
> @@ -0,0 +1,4 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +obj-$(CONFIG_SIFIVE_L2)	+= sifive_l2_cache.o
> +
> diff --git a/arch/riscv/mm/sifive_l2_cache.c b/drivers/soc/sifive/sifive_l2_cache.c
> similarity index 100%
> rename from arch/riscv/mm/sifive_l2_cache.c
> rename to drivers/soc/sifive/sifive_l2_cache.c
> -- 
> 2.20.1
> 
>