From: "David S. Miller" <davem@redhat.com>
To: James.Bottomley@steeleye.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: [BK-2.5] Update the generic DMA API to take GFP_ flags on
Date: Tue, 14 Jan 2003 07:30:23 -0800 (PST) [thread overview]
Message-ID: <20030114.073023.89921980.davem@redhat.com> (raw)
In-Reply-To: <200301141530.h0EFUGH02371@localhost.localdomain>
From: James Bottomley <James.Bottomley@steeleye.com>
Date: Tue, 14 Jan 2003 10:30:15 -0500
A GFP_KERNEL request is safely implemented as GFP_ATOMIC as long as the caller
checks return for NULL. for dma_alloc_coherent return checking is a
requirement because the system may return NULL anyway if it is out of mappings
even with a GFP_KERNEL flag.
Now what about the corollary, a platform that needs
to sleep to setup the cpu mapings in a race-free manner?
It could not ever honor GFP_ATOMIC in that case.
next prev parent reply other threads:[~2003-01-14 15:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-14 15:30 [BK-2.5] Update the generic DMA API to take GFP_ flags on James Bottomley
2003-01-14 15:30 ` David S. Miller [this message]
2003-01-14 15:51 ` James Bottomley
2003-01-14 15:51 ` Russell King
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