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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1179399082.4586.10.camel@daplas>
Date:	Thu, 17 May 2007 18:51:22 +0800
From:	"Antonino A. Daplas" <adaplas@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Andrew Morton <akpm@...l.org>,
	Linux Fbdev development list 
	<linux-fbdev-devel@...ts.sourceforge.net>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 10/10] [HEADS UP] fbdev: Move arch-specific bits to
	their respective subdirectories

On Thu, 2007-05-17 at 10:49 +0100, Christoph Hellwig wrote:
> On Thu, May 17, 2007 at 05:33:48AM +0800, Antonino A. Daplas wrote:
> > -#if defined(__sparc__) && !defined(__sparc_v9__)
> > -	/* Should never get here, all fb drivers should have their own
> > -	   mmap routines */
> > -	return -EINVAL;
> > -#else
> > -	/* !sparc32... */
> > +	if (fb_mmap_required())
> > +		return -EINVAL;
> > +
> 
> I don't like this bit.

Me too, actually. I did it this way because I don't want to deviate from
the old code too much. Since all sparc32 drivers are either linked to
sbuslib.c or has their own fb_mmap method, the above test is redundant. 
I'll leave the decision to remove the above test to David Miller.

>   It's just that all sparc frame buffers happen
> to have a mmap method but there's nothing fundamentally arch specific
> here.  You should be able to plug a pci video card into any linux
> supported machine provided the fb driver does the full setup (which
> only very few do in practice, but..)
> 
> So I'd just require drivers to have a fb_mmap method and make fb_mmap
> the default one.

This one is a tad bit more complicated, so I'll leave the present setup
for now. Once the arch-specific parts are properly separated, maybe I'll
take that step.
  
>   The page protection cleanup is still nice of course,
> but it might make sense to give it a more generic name as it's not
> really fb specific.

Any suggestion for a name? io_pgprotect() perhaps?

Tony


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/