Sunway inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5GFS3

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When csum_partial_copy_from_user is called in an interrupt,
__copy_from_user will modify floating point register f10-f15
without restore register value. This will cause the value of
the userspace register to be corrupted. Use memcpy() instead
when called from kernel space.
Signed-off-by: NZhou Xuemei <zhouxuemei@wxiat.com>
Signed-off-by: NGu Zitao <guzitao@wxiat.com>