On Wed, May 29, 2019 at 01:28:40PM +0300, laurentiu.tudor@xxxxxxx wrote: > From: Laurentiu Tudor <laurentiu.tudor@xxxxxxx> > > For HCs that have local memory, replace the current DMA API usage > with a genalloc generic allocator to manage the mappings for these > devices. To help users, introduce a new HCD API, > usb_hcd_setup_local_mem() that will setup up the genalloc backing > up the device local memory. It will be used in subsequent patches. > This is in preparation for dropping the existing "coherent" dma > mem declaration APIs. Current implementation was relying on a short > circuit in the DMA API that in the end, was acting as an allocator > for these type of devices. > For sh arch to compile GENERIC_ALLOCATOR needs to be selected in > Kconfig. > > For context, see thread here: https://lkml.org/lkml/2019/4/22/357 > > Signed-off-by: Laurentiu Tudor <laurentiu.tudor@xxxxxxx> > Signed-off-by: Fredrik Noring <noring@xxxxxxxxxx> > Tested-by: Fredrik Noring <noring@xxxxxxxxxx> > Reported-by: kbuild test robot <lkp@xxxxxxxxx> > --- > drivers/usb/Kconfig | 1 + > drivers/usb/core/buffer.c | 9 +++++++++ > drivers/usb/core/hcd.c | 36 ++++++++++++++++++++++++++++++++++++ > drivers/usb/host/ohci-hcd.c | 23 ++++++++++++++++++----- > drivers/usb/host/ohci-mem.c | 35 +++++++++++++++++++++++++++++++---- > drivers/usb/host/ohci.h | 2 ++ > include/linux/usb/hcd.h | 5 +++++ > 7 files changed, 102 insertions(+), 9 deletions(-) > > diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig > index e4b27413f528..389c57d8eba7 100644 > --- a/drivers/usb/Kconfig > +++ b/drivers/usb/Kconfig > @@ -45,6 +45,7 @@ config USB_ARCH_HAS_HCD > config USB > tristate "Support for Host-side USB" > depends on USB_ARCH_HAS_HCD > + select GENERIC_ALLOCATOR Are there any arches that does not have GENERIC_ALLOCATOR? I don't want to suddenly cut off a bunch of working systems from having USB support. thanks, greg k-h
