linux-kernel - Re: [PATCH v3 4/4] misc: sram: Allow ARM64 to select SRAM

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Date:   Wed, 28 Jun 2017 15:55:59 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        "open list:GENERIC INCLUDE/ASM HEADER FILES" 
        <linux-arch@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
        Dave Gerlach <d-gerlach@...com>,
        Tony Lindgren <tony@...mide.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Russell King <linux@...linux.org.uk>,
        open list <linux-kernel@...r.kernel.org>,
        bcm-kernel-feedback-list@...adcom.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        linux-omap@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
        Keerthy J <j-keerthy@...com>
Subject: Re: [PATCH v3 4/4] misc: sram: Allow ARM64 to select SRAM_EXEC

On Fri, Jun 16, 2017 at 05:07:44PM -0700, Florian Fainelli wrote:
> Now that ARM64 also has a fncpy() implementation, allow selection
> SRAM_EXEC for ARM64 as well.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  drivers/misc/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> index 07bbd4cc1852..ac8779278c0c 100644
> --- a/drivers/misc/Kconfig
> +++ b/drivers/misc/Kconfig
> @@ -464,7 +464,7 @@ config SRAM
>  	bool "Generic on-chip SRAM driver"
>  	depends on HAS_IOMEM
>  	select GENERIC_ALLOCATOR
> -	select SRAM_EXEC if ARM
> +	select SRAM_EXEC if ARM || ARM64
>  	help
>  	  This driver allows you to declare a memory region to be managed by
>  	  the genalloc API. It is supposed to be used for small on-chip SRAM

As stated in another thread [1], NAK to this patch.

Currently there are no users of this interface that we wish to enable
for arm64, and this is liable to be abused to add platform-specific
stuff that we expect to live in PSCI or other secure FW.

Until we have a user that does not fall into that bucket, I see no
reason to enable this for arm64.

Thanks,
Mark.

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-June/516161.html