linux-kernel - Re: AZFS file system proposal

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Message-ID: <20080709111402.5af92580@mercedes-benz.boeblingen.de.ibm.com>
Date:	Wed, 9 Jul 2008 11:14:02 +0200
From:	Maxim Shchetynin <maxim@...ux.vnet.ibm.com>
To:	linux-fsdevel@...r.kernel.org, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Cc:	benh@...nel.crashing.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: AZFS file system proposal

Am Wed, 09 Jul 2008 18:58:38 +1000
schrieb Benjamin Herrenschmidt <benh@...nel.crashing.org>:

> On Tue, 2008-07-01 at 16:59 +0200, Arnd Bergmann wrote:
> > I wouldn't hold up merging the file system for this problem, but
> > until it is solved, the Kconfig entry should probably have
> > a "depends on PPC".
> 
> Better, use an ifdef for powerpc flags, and #else to pgprot_noncached.

Thank you Ben. Then, how about this?

azfs_mmap(struct file *file, struct vm_area_struct *vma)
{
...
...
...
#ifdef CONFIG_PPC
	pgprot_t page_prot;
#endif
...
...
...
#ifdef CONFIG_PPC
	page_prot = pgprot_val(vma->vm_page_prot);
	page_prot |= (_PAGE_NO_CACHE | _PAGE_RW);
	page_prot &= ~_PAGE_GUARDED;
	vma->vm_page_prot = __pgprot(page_prot);
#else
	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
#endif
...
...
...

-- 
Mit freundlichen Grüßen / met vriendelijke groeten / avec regards

    Maxim V. Shchetynin
    Linux Kernel Entwicklung
    IBM Deutschland Research & Development GmbH
    Linux für Cell, Abteilung 3250
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    71032 Böblingen

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