powerpc: Make syscall tracing use tracehook.h helpers
This changes powerpc syscall tracing to use the new tracehook.h entry points. There is no change, only cleanup. In addition, the assembly changes allow do_syscall_trace_enter() to abort the syscall without losing the information about the original r0 value. Signed-off-by: NRoland McGrath <roland@redhat.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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