linux-kernel - Can a buffer allocated by "vmalloc( )" be used to make DMA transmission (the buffer will be used by BIO structure) on X86

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Message-ID: <015c01c7397b$e9eb6fb0$0100a8c0@sslabmayasky>
Date:	Tue, 16 Jan 2007 22:37:56 +0800
From:	"Yu-Chen Wu" <g944370@...nthu.edu.tw>
To:	<linux-kernel@...r.kernel.org>
Subject: Can a buffer allocated by "vmalloc( )" be used to make DMA transmission (the buffer will be used by BIO structure) on X86_64 platform?

Hi all,
Can a buffer allocated by "vmalloc( )" be used to make DMA transmission (the
buffer will be used by BIO structure) on X86_64 platform?
I need a big buffer (cache) maybe 64MB or bigger, so I call vmalloc to
allocate the buffer.
If possible, how to get the pages in the buffer?

Thanks

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