Messages in this thread | | | From | David Brownell <> | Subject | Re: [PATCH] jffs2 summary allocation | Date | Fri, 4 Apr 2008 16:58:38 -0700 |
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On Friday 04 April 2008, Josh Boyer wrote: > > > ... This means specifically that you may _not_ use the > > memory/addresses returned from vmalloc() for DMA. ... > > > > So I'm rather surprised to see *ANY* kernel code trying to do > > that. That rule has been in effect for many, many years now. > > I don't think it was intentional. You're going through several layers > here: > > JFFS2 -> mtd parts -> mtd dataflash -> atmel_spi. > > Typically MTD drivers aren't doing DMAs to flash and JFFS2 has no idea > which particular chip driver is being used because it's abstracted by > MTD.
That's true ... although I can imagine using DMA to avoid dcache trashing if its setup cost is low enough, with either NAND or NOR chips.
Still: in this context vmalloc() is wrong.
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