[PATCH v5 09/15] arch/powerpc: don't initialize kasan if it's disabled
From: Baoquan He <hidden>
Date: 2026-02-25 08:16:17
Also in:
linux-arm-kernel, linux-mm, linux-riscv, linux-s390, linux-um, lkml, loongarch
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
Here, kasan is disabled if specified 'kasan=off' in kernel cmdline. This includes 32bit, book3s/64 and book3e/64. Signed-off-by: Baoquan He <redacted> Cc: linuxppc-dev@lists.ozlabs.org --- 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