[PATCH v3 03/12] mm/kasan/sw_tags: don't initialize kasan if it's disabled

[Baoquan He]

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

Signed-off-by: Baoquan He <b...@redhat.com>
---
 mm/kasan/sw_tags.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c
index 01f19bc4a326..dd963ba4d143 100644
--- a/mm/kasan/sw_tags.c
+++ b/mm/kasan/sw_tags.c
@@ -40,11 +40,17 @@ void __init kasan_init_sw_tags(void)
 {
        int cpu;
 
+       if (kasan_arg_disabled)
+               return;
+
        for_each_possible_cpu(cpu)
                per_cpu(prng_state, cpu) = (u32)get_cycles();
 
        kasan_init_tags();
 
+       /* KASAN is now initialized, enable it. */
+       static_branch_enable(&kasan_flag_enabled);
+
        pr_info("KernelAddressSanitizer initialized (sw-tags, stacktrace=%s)\n",
                str_on_off(kasan_stack_collection_enabled()));
 }
-- 
2.41.0