arm64: kpti: Use early_param for kpti= command-line option

We inspect __kpti_forced early on as part of the cpufeature enable callback which remaps the swapper page table using non-global entries. Ensure that __kpti_forced has been updated to reflect the kpti= command-line option before we start using it. Fixes: ea1e3de ("arm64: entry: Add fake CPU feature for unmapping the kernel at EL0") Cc: <[email protected]> # 4.16.x- Reported-by: Wei Xu <[email protected]> Tested-by: Sudeep Holla <[email protected]> Tested-by: Wei Xu <[email protected]> Signed-off-by: Will Deacon <[email protected]> Signed-off-by: Catalin Marinas <[email protected]>
josf · Jun 22, 2018 · b5b7dd6 · b5b7dd6
1 parent b154886
commit b5b7dd6
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
@@ -937,7 +937,7 @@ static int __init parse_kpti(char *str)
 	__kpti_forced = enabled ? 1 : -1;
 	return 0;
 }
-__setup("kpti=", parse_kpti);
+early_param("kpti", parse_kpti);
 #endif	/* CONFIG_UNMAP_KERNEL_AT_EL0 */
 
 #ifdef CONFIG_ARM64_HW_AFDBM