Subject: [PATCH v5 09/15] arch/powerpc: don't initialize kasan if it's disabled

From: Baoquan He <[email-masked]>
Date: Wed, 25 Feb 2026 16:14:06 +0800

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

This includes 32bit, book3s/64 and book3e/64.

Signed-off-by: Baoquan He <[email-masked]>
Cc: [email-masked]
---
 arch/powerpc/mm/kasan/init_32.c        | 6 +++++-
 arch/powerpc/mm/kasan/init_book3e_64.c | 4 ++++
 arch/powerpc/mm/kasan/init_book3s_64.c | 4 ++++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/kasan/init_32.c b/arch/powerpc/mm/kasan/init_32.c
index 1d083597464f..0ea2a636c992 100644
--- a/arch/powerpc/mm/kasan/init_32.c
+++ b/arch/powerpc/mm/kasan/init_32.c
@@ -141,6 +141,10 @@ void __init kasan_init(void)
 	u64 i;
 	int ret;
 
+	/* If KASAN is disabled via command line, don't initialize it. */
+	if (kasan_arg_disabled)
+		return;
+
 	for_each_mem_range(i, &base, &end) {
 		phys_addr_t top = min(end, total_lowmem);
 
@@ -170,7 +174,7 @@ void __init kasan_init(void)
 
 void __init kasan_late_init(void)
 {
-	if (IS_ENABLED(CONFIG_KASAN_VMALLOC))
+	if (IS_ENABLED(CONFIG_KASAN_VMALLOC) && kasan_enabled())
 		kasan_unmap_early_shadow_vmalloc();
 }
 
diff --git a/arch/powerpc/mm/kasan/init_book3e_64.c b/arch/powerpc/mm/kasan/init_book3e_64.c
index 0d3a73d6d4b0..fbe4c9a7e460 100644
--- a/arch/powerpc/mm/kasan/init_book3e_64.c
+++ b/arch/powerpc/mm/kasan/init_book3e_64.c
@@ -111,6 +111,10 @@ void __init kasan_init(void)
 	u64 i;
 	pte_t zero_pte = pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL_RO);
 
+	/* If KASAN is disabled via command line, don't initialize it. */
+	if (kasan_arg_disabled)
+		return;
+
 	for_each_mem_range(i, &start, &end)
 		kasan_init_phys_region(phys_to_virt(start), phys_to_virt(end));
 
diff --git a/arch/powerpc/mm/kasan/init_book3s_64.c b/arch/powerpc/mm/kasan/init_book3s_64.c
index dcafa641804c..f7906f9ef9be 100644
--- a/arch/powerpc/mm/kasan/init_book3s_64.c
+++ b/arch/powerpc/mm/kasan/init_book3s_64.c
@@ -54,6 +54,10 @@ void __init kasan_init(void)
 	u64 i;
 	pte_t zero_pte = pfn_pte(virt_to_pfn(kasan_early_shadow_page), PAGE_KERNEL);
 
+	/* If KASAN is disabled via command line, don't initialize it. */
+	if (kasan_arg_disabled)
+		return;
+
 	if (!early_radix_enabled()) {
 		pr_warn("KASAN not enabled as it requires radix!");
 		return;
-- 
2.52.0