powerpc/ptrace: Preserve previous TM fprs/vsrs on short regset write
commit b34ca601 upstream. Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET to fill all the check pointed registers, the thread's old check pointed registers are preserved. Fixes: 9d3918f7 ("powerpc/ptrace: Enable support for NT_PPC_CVSX") Fixes: 19cbcbf7 ("powerpc/ptrace: Enable support for NT_PPC_CFPR") Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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