Eugeniy Paltsev 2fc69e55f3 ARCv2: lib: memcpy: fix doing prefetchw outside of buffer ... [ Upstream commit f8a15f9766 ] ARCv2 optimized memcpy uses PREFETCHW instruction for prefetching the next cache line but doesn't ensure that the line is not past the end of the buffer. PRETECHW changes the line ownership and marks it dirty, which can cause data corruption if this area is used for DMA IO. Fix the issue by avoiding the PREFETCHW. This leads to performance degradation but it is OK as we'll introduce new memcpy implementation optimized for unaligned memory access using. We also cut off all PREFETCH instructions at they are quite useless here: * we call PREFETCH right before LOAD instruction call. * we copy 16 or 32 bytes of data (depending on CONFIG_ARC_HAS_LL64) in a main logical loop. so we call PREFETCH 4 times (or 2 times) for each L1 cache line (in case of 64B L1 cache Line which is default case). Obviously this is not optimal. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-03-23 20:09:51 +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: fix __ffs return value to avoid build warnings	2019-03-05 17:58:48 +01:00
kernel	ARC: show_regs: lockdep: avoid page allocator...	2019-03-05 17:58:48 +01:00
lib	ARCv2: lib: memcpy: fix doing prefetchw outside of buffer	2019-03-23 20:09:51 +01:00
mm	ARC: adjust memblock_reserve of kernel memory	2019-01-31 08:14:35 +01:00
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	clocksource/drivers/arc_timer: Utilize generic sched_clock	2019-01-09 17:38:42 +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