mainline inclusion
from mainline-v5.11-rc1
commit f253d827
category: performance
bugzilla: https://e.gitee.com/open_euler/issues/list?issue=I4SCW7
CVE: NA

-------------------------------------------------------------------------

As a step towards implementing __{get,put}_kernel_nofault(), this patch
splits most user-memory specific logic out of __{get,put}_user(), with
the memory access and fault handling in new __{raw_get,put}_mem()
helpers.

For now the LDR/LDTR patching is left within the *get_mem() helpers, and
will be removed in a subsequent patch.

There should be no functional change as a result of this patch.
Signed-off-by: NMark Rutland <mark.rutland@arm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20201202131558.39270-7-mark.rutland@arm.comSigned-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NZhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>