Re: [PATCH v11 6/12] x86, mm, asm-gen: Add ioremap_wt() for WT

From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Toshi Kani <toshi.kani@hp.com>
Cc: Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Arnd Bergmann <arnd@arndb.de>, Linux MM <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	the arch/x86 maintainers <x86@kernel.org>,
	linux-nvdimm@lists.01.org, jgross@suse.com,
	stefan.bader@canonical.com, Andy Lutomirski <luto@amacapital.net>,
	Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
	yigal@plexistor.com,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Elliott@hp.com, "Luis R. Rodriguez" <mcgrof@suse.com>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v11 6/12] x86, mm, asm-gen: Add ioremap_wt() for WT
Date: Sat, 30 May 2015 11:18:26 +0200	[thread overview]
Message-ID: <CAMuHMdWLMUr9ggkhbOiDSsc_eq04En3L5oX5pL=9gHuR6JDb+w@mail.gmail.com> (raw)
In-Reply-To: <1432940350-1802-7-git-send-email-toshi.kani@hp.com>

On Sat, May 30, 2015 at 12:59 AM, Toshi Kani <toshi.kani@hp.com> wrote:
> --- a/include/asm-generic/io.h
> +++ b/include/asm-generic/io.h
> @@ -785,8 +785,17 @@ static inline void __iomem *ioremap_wc(phys_addr_t offset, size_t size)
>  }
>  #endif
>
> +#ifndef ioremap_wt
> +#define ioremap_wt ioremap_wt
> +static inline void __iomem *ioremap_wt(phys_addr_t offset, size_t size)
> +{
> +       return ioremap_nocache(offset, size);
> +}
> +#endif
> +
>  #ifndef iounmap
>  #define iounmap iounmap
> +
>  static inline void iounmap(void __iomem *addr)
>  {
>  }
> diff --git a/include/asm-generic/iomap.h b/include/asm-generic/iomap.h
> index 1b41011..d8f8622 100644
> --- a/include/asm-generic/iomap.h
> +++ b/include/asm-generic/iomap.h
> @@ -66,6 +66,10 @@ extern void ioport_unmap(void __iomem *);
>  #define ioremap_wc ioremap_nocache
>  #endif
>
> +#ifndef ARCH_HAS_IOREMAP_WT
> +#define ioremap_wt ioremap_nocache
> +#endif

Defining ioremap_wt in two different places in asm-generic looks fishy to me.

If <asm/io.h> already provides it (either through asm-generic/io.h or
arch/<arch>/include/asm/io.h), why does asm-generic/iomap.h need to define
its own version?

I see this pattern already exists for ioremap_wc...

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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