Messages in this thread |  | | Date | Tue, 14 Jan 2003 07:30:23 -0800 (PST) | Subject | Re: [BK-2.5] Update the generic DMA API to take GFP_ flags on | From | "David S. Miller" <> |
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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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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