linux-kernel - [PATCH v4 05/12] arch/arm64: don't initialize kasan if it's disabled

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Message-ID: <20251128033320.1349620-6-bhe@redhat.com>
Date: Fri, 28 Nov 2025 11:33:13 +0800
From: Baoquan He <bhe@...hat.com>
To: linux-mm@...ck.org
Cc: ryabinin.a.a@...il.com,
	andreyknvl@...il.com,
	glider@...gle.com,
	dvyukov@...gle.com,
	vincenzo.frascino@....com,
	akpm@...ux-foundation.org,
	kasan-dev@...glegroups.com,
	linux-kernel@...r.kernel.org,
	kexec@...ts.infradead.org,
	elver@...gle.com,
	sj@...nel.org,
	lorenzo.stoakes@...cle.com,
	snovitoll@...il.com,
	christophe.leroy@...roup.eu,
	Baoquan He <bhe@...hat.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v4 05/12] arch/arm64: don't initialize kasan if it's disabled

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

Signed-off-by: Baoquan He <bhe@...hat.com>
Cc: linux-arm-kernel@...ts.infradead.org
---
 arch/arm64/mm/kasan_init.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
index abeb81bf6ebd..eb49fdad4ef1 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();
 	kasan_init_generic();
-- 
2.41.0