tile: define a macro ktext_writable_addr to get writable kernel text address
It is used by kgdb, ftrace, kprobe and jump label, so we factor this out into a helper routine. Reviewed-by: NChris Metcalf <cmetcalf@ezchip.com> Signed-off-by: NZhigang Lu <zlu@ezchip.com> Signed-off-by: NChris Metcalf <cmetcalf@ezchip.com>
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