[PATCH] ARM: dma-mapping: support debug_dma_mapping_error

[Russell King - ARM Linux]

On Mon, Oct 22, 2012 at 08:44:03PM +0800, Ming Lei wrote:
> Without the patch, kind of below warning will be dumped if DMA-API
> debug is enabled:
> 
> [   11.069763] ------------[ cut here ]------------
> [   11.074645] WARNING: at lib/dma-debug.c:948 check_unmap+0x770/0x860()
> [   11.081420] ehci-omap ehci-omap.0: DMA-API: device driver failed to
> check map error[device address=0x0000000
> 0adb78e80] [size=8 bytes] [mapped as single]
> [   11.095611] Modules linked in:
> 
> Cc: Russell King <linux at arm.linux.org.uk>
> Cc: Marek Szyprowski <m.szyprowski at samsung.com>
> Signed-off-by: Ming Lei <ming.lei at canonical.com>

Would you mind explaining why you think it's fine to send a patch for the
mainline kernel adding a function call to a header file which is not even
in the mainline kernel?

My guess is that the Canonical kernel has some additional checking here
which mainline kernels don't have, which means your patch should never have
been submitted (or even applied.)

On Marek's side, why didn't you try to build your tree at least once in
the last 3 days before pushing this patch to Linus?