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Message-ID: <4DFCA2DD.9060707@mvista.com>
Date:   Sat, 18 Jun 2011 17:06:37 +0400
From:   Sergei Shtylyov <sshtylyov@mvista.com>
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To:     Ralf Baechle <ralf@linux-mips.org>
CC:     Christoph Hellwig <hch@lst.de>,
        naveen yadav <yad.naveen@gmail.com>, linux-mips@linux-mips.org
Subject: Re: flush_kernel_vmap_range() invalidate_kernel_vmap_range() API
 not exists for MIPS
References: <AANLkTimkh2QLvupu+62NGrKfqRb_gC7KLCAKkEoS9N9N@mail.gmail.com> <20110325172709.GC8483@linux-mips.org> <BANLkTimo6BEgDnTh+sPVR+MELyxiwJoFGw@mail.gmail.com> <20110616180250.GA13025@lst.de> <20110617152028.GA14107@linux-mips.org>
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Hello.

On 17-06-2011 19:20, Ralf Baechle wrote:

>> Ralf,

>> I'll second that request.  We'll really need this, right now embedded XFS
>> users are hacking around it in horrible ways.

> Here's my shot at the problem.  I don't have the time to setup a XFS
> filesystem and tools for testing before the weekend so all I claim is this
> patch builds for R4000-class CPUs but it should be pretty close to the
> real thing.

> Naveen, can you give this patch a spin?  Thanks!

>    Ralf

> Signed-off-by: Ralf Baechle<ralf@linux-mips.org>

[...]

> diff --git a/arch/mips/include/asm/cacheflush.h b/arch/mips/include/asm/cacheflush.h
> index 40bb9fd..69468de 100644
> --- a/arch/mips/include/asm/cacheflush.h
> +++ b/arch/mips/include/asm/cacheflush.h
> @@ -114,4 +114,28 @@ unsigned long run_uncached(void *func);
>   extern void *kmap_coherent(struct page *page, unsigned long addr);
>   extern void kunmap_coherent(void);
>
> +#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
> +static inline void flush_kernel_dcache_page(struct page *page)
> +{
> +	BUG_ON(cpu_has_dc_aliases&&  PageHighMem(page));
> +}
> +
> +/*
> + * For now flush_kernel_vmap_range and invalidate_kernel_vmap_range both do a
> + * cache writeback and invalidate operation.
> + */
> +extern void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
> +
> +static inline void flush_kernel_vmap_range(void *vaddr, int size)
> +{
> +	if (cpu_has_dc_aliases)
> +		__flush_kernel_vmap_range((unsigned long) vaddr, size);
> +}
> +
> +static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
> +{
> +	if (cpu_has_dc_aliases)
> +		__flush_kernel_vmap_range((unsigned long) vaddr, size);

    Not __invalidate_kernel_vmap_range()?

WBR, Sergei