linux-kernel - Re: [Linux-fbdev-devel] [PATCH 10/10] [HEADS UP] fbdev: Move arch-specific bits to their respective subdirectories

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Date:	Thu, 17 May 2007 18:52:32 +0800
From:	"Antonino A. Daplas" <adaplas@...il.com>
To:	linux-fbdev-devel@...ts.sourceforge.net
Cc:	Andrew Morton <akpm@...l.org>,
	Linux/m68k <linux-m68k@...r.kernel.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	uClinux list <uclinux-dev@...inux.org>
Subject: Re: [Linux-fbdev-devel] [PATCH 10/10] [HEADS UP] fbdev: Move
	arch-specific bits to their respective subdirectories

On Thu, 2007-05-17 at 11:43 +0200, Geert Uytterhoeven wrote:
> On Thu, 16 May 2007, Antonino A. Daplas wrote:
> > diff --git a/include/asm-m68k/fb.h b/include/asm-m68k/fb.h
> > new file mode 100644
> > index 0000000..7d4a28f
> > --- /dev/null
> > +++ b/include/asm-m68k/fb.h
> > @@ -0,0 +1,28 @@
> > +#ifndef _ASM_FB_H_
> > +#define _ASM_FB_H_
> > +
> > +#include <linux/fs.h>
> > +#include <asm/page.h>
> > +#include <asm/setup.h>
> > +
> > +#ifdef CONFIG_SUN3
> > +static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma)
> > +{
> > +	pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE;
> > +}
> > +#elif defined(CONFIG_MMU)
>    ^^^^^^^^^^^^^^^^^^^^^^^^^
> This can be a plain `#else', as m68knommu hasn't been merged with m68k
> (yet :-)
> 
> > +static inline void fb_pgprotect(struct file *file, struct vm_area_struct *vma)
> > +	if (CPU_IS_020_OR_030)
> > +		pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030;
> > +	if (CPU_IS_040_OR_060) {
> > +		pgprot_val(vma->vm_page_prot) &= _CACHEMASK040;
> > +		/* Use no-cache mode, serialized */
> > +		pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S;
> > +	}
> > +}
> > +#else
>    ^^^^^
> So this branch can go away
> 
> > +#warning What do we have to do here??
> > +#define fb_pgprotect(...) do {} while (0)
> > +#endif /* CONFIG_SUN3 */
> > +
> > +#endif /* _ASM_FB_H_ */
> > diff --git a/include/asm-m68knommu/fb.h b/include/asm-m68knommu/fb.h
> > new file mode 100644
> > index 0000000..dc9d1be
> > --- /dev/null
> > +++ b/include/asm-m68knommu/fb.h
> > @@ -0,0 +1,7 @@
> > +#ifndef _ASM_FB_H_
> > +#define _ASM_FB_H_
> > +
> > +#warning What do we have to do here??
> > +#define fb_pgprotect(...) do {} while (0)
> > +
> > +#endif /* _ASM_FB_H_ */
> 
> If the m68knommu case in fb_mmap() was empty before, it should be empty here
> too, so I guess the warning can go away.

Thanks. It's confusing when there's multiple directories for one
architecture.

Tony


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