printk: add support of hh length modifier for printk
Impact: new feature, extend vsprintf format strings hh is used as length modifier for signed char or unsigned char. It is supported by glibc, we add kernel support now. Signed-off-by: NZhao Lei <zhaolei@cn.fujitsu.com> Acked-by: NLai Jiangshan <laijs@cn.fujitsu.com> Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: torvalds@linux-foundation.org Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <49CC9739.30107@cn.fujitsu.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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