Xiongfeng Wang d5624bb29f asm-generic: introduce io_stop_wc() and add implementation for ARM64 ... For memory accesses with write-combining attributes (e.g. those returned by ioremap_wc()), the CPU may wait for prior accesses to be merged with subsequent ones. But in some situation, such wait is bad for the performance. We introduce io_stop_wc() to prevent the merging of write-combining memory accesses before this macro with those after it. We add implementation for ARM64 using DGH instruction and provide NOP implementation for other architectures. Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com> Suggested-by: Will Deacon <will@kernel.org> Suggested-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20211221035556.60346-1-wangxiongfeng2@huawei.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2021-12-22 10:44:53 +00:00
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asm	asm-generic: introduce io_stop_wc() and add implementation for ARM64	2021-12-22 10:44:53 +00:00
uapi/asm	arm64: Add HWCAP for self-synchronising virtual counter	2021-10-19 10:56:20 +01:00