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From: Arjan van de Ven <arjan@infradead.org>
To: thomas@tungstengraphics.com
Cc: davej@redhat.com, linux-kernel@vger.kernel.org, arlied@gmail.com
Subject: Re: [PATCH] agpgart: Allow drm-populated agp memory types
Date: Tue, 09 Jan 2007 06:05:37 -0800	[thread overview]
Message-ID: <1168351537.3180.270.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <11683309992144-git-send-email-thomas@tungstengraphics.com>

On Tue, 2007-01-09 at 09:23 +0100, thomas@tungstengraphics.com wrote:
> +
> +void agp_vkmalloc(size_t size, unsigned long **addr, u8 *vmalloc_flag)
> +{
> +	void *tmp = NULL;
> +
> +	*vmalloc_flag = 0;
> +
> +	if (size <= 2*PAGE_SIZE) {
> +		tmp = kmalloc(size, GFP_KERNEL);
> +	}
> +	if (tmp == NULL) {
> +		tmp = vmalloc(size);
> +		*vmalloc_flag = 1;
> +	}
> +
> +	*addr = tmp;
> +}
> +EXPORT_SYMBOL(agp_vkmalloc);


if you don't do this "fallback" thing the caller can just know it is
vmalloc due to the size... (and a 2 page kmalloc isn't going to fail on
you with GFP_KERNEL; also if you really want to deal with this failure
also tell the VM you're ok with failure (__GFP_NORETRY and such)...
but unless you do, things get a lot simpler by not doing this "fall
back" thing.

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org


  reply	other threads:[~2007-01-09 14:05 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-12-08 18:24 [patch 1/2] agpgart - allow user-populated " Thomas Hellström
2006-12-08 22:03 ` Arjan van de Ven
2006-12-08 22:17 ` Arjan van de Ven
2006-12-08 23:05   ` Thomas Hellström
2006-12-19  8:47     ` Arjan van de Ven
2006-12-19  9:44       ` Thomas Hellström
2006-12-19 12:17         ` Arjan van de Ven
2006-12-19 12:47           ` Thomas Hellström
2006-12-19 13:11             ` Arjan van de Ven
2006-12-19 14:11               ` Thomas Hellström
2007-01-08  9:33               ` agpgart: drm-populated " thomas
2007-01-09  2:37                 ` Arjan van de Ven
2007-01-09  8:28                   ` Thomas Hellström
2007-01-09  8:23                 ` [PATCH] agpgart: Allow drm-populated agp " thomas
2007-01-09 14:05                   ` Arjan van de Ven [this message]
2007-01-09 14:06                   ` Arjan van de Ven
2007-01-23  9:33                     ` New patch: drm-populated " thomas
2007-01-23  9:33                       ` [PATCH] agpgart: Allow drm-populated agp " thomas

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