From: Ingo Molnar <mingo@elte.hu>
To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Andrew Morton <akpm@osdl.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [patch] bootmem: use MAX_DMA_ADDRESS instead of LOW32LIMIT
Date: Fri, 28 Jul 2006 15:13:06 +0200 [thread overview]
Message-ID: <20060728131306.GA32513@elte.hu> (raw)
In-Reply-To: <20060728130852.GB9559@osiris.boeblingen.de.ibm.com>
* Heiko Carstens <heiko.carstens@de.ibm.com> wrote:
> From: Heiko Carstens <heiko.carstens@de.ibm.com>
>
> __alloc_bootmem_low() and __alloc_bootmem_low_node() should use
> MAX_DMA_ADDRESS as limit which is per architecture instead of a global
> LOW32LIMIT. Otherwise the bootmem allocator may return addresses to
> memory regions which cannot be used for DMA access.
> -#define LOW32LIMIT 0xffffffff
> if ((ptr = __alloc_bootmem_core(bdata, size,
> - align, goal, LOW32LIMIT)))
> + align, goal, MAX_DMA_ADDRESS)))
but this limits things to 16MB on i686. Are you sure this wont break
anything?
Ingo
next prev parent reply other threads:[~2006-07-28 13:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-28 13:08 [patch] bootmem: use MAX_DMA_ADDRESS instead of LOW32LIMIT Heiko Carstens
2006-07-28 13:13 ` Ingo Molnar [this message]
2006-07-28 14:58 ` Martin Schwidefsky
2006-07-28 19:41 ` Heiko Carstens
2006-07-29 3:55 ` Ingo Molnar
2006-08-07 5:27 ` Randy.Dunlap
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