[PATCH v2 05/12] arch/arm64: don't initialize kasan if it's disabled

[Baoquan He]

And also add code to enable kasan_flag_enabled, this is for later
usage.

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

Signed-off-by: Baoquan He <b...@redhat.com>
---
 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 d541ce45daeb..0e4ffe3f5d0e 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 +400,9 @@ void __init kasan_populate_early_vm_area_shadow(void 
*start, unsigned long size)
 
 void __init kasan_init(void)
 {
+       if (kasan_arg_disabled)
+               return;
+
        kasan_init_shadow();
        kasan_init_depth();
 #if defined(CONFIG_KASAN_GENERIC)
@@ -405,6 +411,7 @@ void __init kasan_init(void)
         * Software and Hardware Tag-Based modes still require
         * kasan_init_sw_tags() and kasan_init_hw_tags() correspondingly.
         */
+       static_branch_enable(&kasan_flag_enabled);
        pr_info("KernelAddressSanitizer initialized (generic)\n");
 #endif
 }
-- 
2.41.0