linux-kernel - Re: [PATCH 1/9] SOC: brcmstb: add memory API

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Message-ID: <20171017082413.GA10574@infradead.org>
Date:   Tue, 17 Oct 2017 01:24:13 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jim Quinlan <jim2101024@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...ux-mips.org,
        devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        Kevin Cernekee <cernekee@...il.com>,
        Brian Norris <computersforpeace@...il.com>
Subject: Re: [PATCH 1/9] SOC: brcmstb: add memory API

> +/* Macros to help extract property data */
> +#define U8TOU32(b, offs) \
> +	((((u32)b[0 + offs] << 0)  & 0x000000ff) | \
> +	 (((u32)b[1 + offs] << 8)  & 0x0000ff00) | \
> +	 (((u32)b[2 + offs] << 16) & 0x00ff0000) | \
> +	 (((u32)b[3 + offs] << 24) & 0xff000000))

Please us helpers like get_unaligned_le32 instead opencoding them.

> +#define DT_PROP_DATA_TO_U32(b, offs) (fdt32_to_cpu(U8TOU32(b, offs)))

And together with this it looks really whacky.  So you're converting
from le to native first and then do another conversion from be to cpu?

Something doesn't work out here.

> +/* -------------------- Functions -------------------- */

Please remove pointless comments like this one.

> +
> +/*
> + * If the DT nodes are handy, determine which MEMC holds the specified
> + * physical address.
> + */
> +#ifdef CONFIG_ARCH_BRCMSTB
> +int __brcmstb_memory_phys_addr_to_memc(phys_addr_t pa, void __iomem *base)

Please move this into the arm arch code.

> +#elif defined(CONFIG_MIPS)

And this into the mips arch code.

> +EXPORT_SYMBOL(brcmstb_memory_phys_addr_to_memc);

> +EXPORT_SYMBOL(brcmstb_memory_memc_size);

Why is this exported?