From: Christoph Lameter <clameter@sgi.com>
To: "Robert P. J. Day" <rpjday@mindspring.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: __get_free_pages: can GFP_DMA omit GFP_KERNEL and GFP_ATOMIC?
Date: Mon, 4 Jun 2007 11:45:52 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0706041143520.24412@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0706030435130.14627@localhost.localdomain>
On Sun, 3 Jun 2007, Robert P. J. Day wrote:
> first, can a call to __get_free_pages to allocate DMA-able memory
> omit specifying either of GFP_KERNEL or GFP_ATOMIC? love's book on
> kernel development strongly suggests you need to specify one or the
> other, but there are a few instances in the tree like this:
Sure that seems to be equivalent to GFP_ATOMIC with no access to emergency
pool memory.
> and, second, i only noticed this as i was going to submit a short
> patch to replace __get_free_pages calls for DMA-able memory with the
> existing equivalent macro __get_dma_pages. is that still considered a
> worthwhile cleanup? there's not that many examples of it, and it
> would just make things consistent.
Sure.
next prev parent reply other threads:[~2007-06-04 18:46 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-03 8:41 Robert P. J. Day
2007-06-04 18:45 ` Christoph Lameter [this message]
2007-06-04 18:53 ` Robert P. J. Day
2007-06-04 19:02 ` Christoph Lameter
2007-06-04 19:07 ` Robert P. J. Day
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