mainline inclusion
from mainline-v5.5-rc3
commit 2e8e1ea8
category:feature
bugzilla:NA
CVE:NA

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

When seeding KALSR on a system where we have architecture level random
number generation make use of that entropy, mixing it in with the seed
passed by the bootloader. Since this is run very early in init before
feature detection is complete we open code rather than use archrandom.h.
Signed-off-by: NMark Brown <broonie@kernel.org>
Reviewed-by: NMark Rutland <mark.rutland@arm.com>
Reviewed-by: NArd Biesheuvel <ardb@kernel.org>
Signed-off-by: NWill Deacon <will@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>