livepatch: move x86 specific ftrace handler code to arch/x86
The execution flow redirection related implemention in the livepatch ftrace handler is depended on the specific architecture. This patch introduces klp_arch_set_pc(like kgdb_arch_set_pc) interface to change the pt_regs. Signed-off-by: NLi Bin <huawei.libin@huawei.com> Acked-by: NJosh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: NJiri Kosina <jkosina@suse.cz>
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