Re: [PATCH 7/9] ARM: DMA: steal memory for DMA coherent mappings
From: Arnd Bergmann <arnd@arndb.de>
Date: 2011-08-12 12:53:47
Also in:
linux-arm-kernel, linux-media, lkml
On Friday 12 August 2011, Marek Szyprowski wrote:
From: Russell King <redacted> Steal memory from the kernel to provide coherent DMA memory to drivers. This avoids the problem with multiple mappings with differing attributes on later CPUs. Signed-off-by: Russell King <redacted> [m.szyprowski: rebased onto 3.1-rc1] Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Hi Marek, Is this the same patch that Russell had to revert because it didn't work on some of the older machines, in particular those using dmabounce? I thought that our discussion ended with the plan to use this only for ARMv6+ (which has a problem with double mapping) but not on ARMv5 and below (which don't have this problem but might need dmabounce). Arnd -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>