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c76662e825
When a thread forks the contents of AMR, IAMR, UAMOR registers in the
newly forked thread are not inherited.
Save the registers before forking, for content of those
registers to be automatically copied into the new thread.
Fixes: cf43d3b26452 ("powerpc: Enable pkey subsystem")
Cc: stable@vger.kernel.org # v4.16+
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>