[PATCH v5 07/15] arch/arm64: don't initialize kasan if it's disabled

[Baoquan He]

Here, kasan is disabled if specified 'kasan=off' in kernel cmdline.

And also need skip kasan_populate_early_vm_area_shadow() if kasan
is disabled.

Signed-off-by: Baoquan He <bhe at redhat.com>
Cc: linux-arm-kernel at lists.infradead.org
---
 arch/arm64/mm/kasan_init.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
index abeb81bf6ebd..4a58e609c81b 100644
--- a/arch/arm64/mm/kasan_init.c
+++ b/arch/arm64/mm/kasan_init.c
@@ -384,6 +384,9 @@ void __init kasan_populate_early_vm_area_shadow(void *start, unsigned long size)
 {
 	unsigned long shadow_start, shadow_end;
 
+	if (!kasan_enabled())
+		return;
+
 	if (!is_vmalloc_or_module_addr(start))
 		return;
 
@@ -397,6 +400,10 @@ void __init kasan_populate_early_vm_area_shadow(void *start, unsigned long size)
 
 void __init kasan_init(void)
 {
+	/* If KASAN is disabled via command line, don't initialize it. */
+	if (kasan_arg_disabled)
+		return;
+
 	kasan_init_shadow();
 	kasan_init_depth();
 	kasan_init_generic();
-- 
2.52.0