Jose Abreu bf69dc3cb1 ARC: io.h: Implement reads{x}()/writes{x}() ... [ Upstream commit 10d443431d ] Some ARC CPU's do not support unaligned loads/stores. Currently, generic implementation of reads{b/w/l}()/writes{b/w/l}() is being used with ARC. This can lead to misfunction of some drivers as generic functions do a plain dereference of a pointer that can be unaligned. Let's use {get/put}_unaligned() helpers instead of plain dereference of pointer in order to fix. The helpers allow to get and store data from an unaligned address whilst preserving the CPU internal alignment. According to [1], the use of these helpers are costly in terms of performance so we added an initial check for a buffer already aligned so that the usage of the helpers can be avoided, when possible. [1] Documentation/unaligned-memory-access.txt Cc: Alexey Brodkin <abrodkin@synopsys.com> Cc: Joao Pinto <jpinto@synopsys.com> Cc: David Laight <David.Laight@ACULAB.COM> Tested-by: Vitor Soares <soares@synopsys.com> Signed-off-by: Jose Abreu <joabreu@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2018-12-21 14:15:16 +01:00
..
boot	ARC: dma [IOC]: mark DMA devices connected as dma-coherent	2018-08-31 12:47:26 -07:00
configs	arc: [devboards] Add support of NFSv3 ACL	2018-12-08 12:59:10 +01:00
include	ARC: io.h: Implement reads{x}()/writes{x}()	2018-12-21 14:15:16 +01:00
kernel	ARC: clone syscall to setp r25 as thread pointer	2018-10-05 14:33:29 -07:00
lib	ARC: dw2 unwind: enable cfi pseudo ops in string lib	2016-09-30 14:48:22 -07:00
mm	ARC: don't check for HIGHMEM pages in arch_dma_alloc	2018-09-04 13:21:38 -07:00
oprofile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
plat-axs10x	ARC: [plat-axs103] refactor the quad core DT quirk code	2017-12-20 12:41:45 -08:00
plat-eznps	arc: [plat-eznps] fix printk warning in arc/plat-eznps/mtm.c	2018-07-30 11:48:49 -07:00
plat-hsdk	ARCv2: [plat-hsdk]: Save accl reg pair by default	2018-07-19 10:36:45 -07:00
plat-sim	ARC: [plat-sim] Include this platform unconditionally	2017-08-04 13:49:47 +05:30
plat-tb10x	arc: select GPIOLIB directly	2016-04-26 14:07:59 +02:00
Kbuild
Kconfig	ARC: change defconfig defaults to ARCv2	2018-12-08 12:59:10 +01:00
Kconfig.debug	Kconfig: consolidate the "Kernel hacking" menu	2018-08-02 08:06:48 +09:00
Makefile	ARC: change defconfig defaults to ARCv2	2018-12-08 12:59:10 +01:00