livepatch/ppc64: Fix preemption check when enabling

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I60N44
CVE: NA

--------------------------------

Misspelling of 'CONFIG_PREEMPTION' may cause old function not being
checked, which results in a running function being livepatched.

Fixes: 20106abf ("livepatch: Check whole stack when CONFIG_PREEMPT is set")
Signed-off-by: NZheng Yejian <zhengyejian1@huawei.com>
Reviewed-by: NKuohai Xu <xukuohai@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/powerpc/kernel/livepatch_64.c

@@ -174,7 +174,7 @@ static int klp_check_activeness_func(struct klp_patch *patch, int enable,
 				 * excution of instructions to be repalced is
 				 * complete.
 				 */
-				if (IS_ENABLED(CONFIG_PREEMTION) ||
+				if (IS_ENABLED(CONFIG_PREEMPTION) ||
 				    (func->force == KLP_NORMAL_FORCE) ||
 				    check_jump_insn(func_addr)) {
 					ret = add_func_to_list(check_funcs, &pcheck,