linux-kernel - [PATCH v2 03/12] mm/kasan/sw_tags: don't initialize kasan if it's disabled

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Message-ID: <20250812124941.69508-4-bhe@redhat.com>
Date: Tue, 12 Aug 2025 20:49:32 +0800
From: Baoquan He <bhe@...hat.com>
To: linux-mm@...ck.org
Cc: ryabinin.a.a@...il.com,
	glider@...gle.com,
	andreyknvl@...il.com,
	dvyukov@...gle.com,
	vincenzo.frascino@....com,
	akpm@...ux-foundation.org,
	kasan-dev@...glegroups.com,
	linux-kernel@...r.kernel.org,
	kexec@...ts.infradead.org,
	sj@...nel.org,
	lorenzo.stoakes@...cle.com,
	elver@...gle.com,
	snovitoll@...il.com,
	Baoquan He <bhe@...hat.com>
Subject: [PATCH v2 03/12] mm/kasan/sw_tags: don't initialize kasan if it's disabled

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

Signed-off-by: Baoquan He <bhe@...hat.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