[PATCH v6 2/2] kasan: call kasan_init_generic in kasan_init

From: Sabyrzhan Tasbolatov <hidden>
Date: 2025-08-10 12:58:13
Also in: linux-arm-kernel, linux-mm, linux-riscv, linux-s390, linux-um, lkml, loongarch
Subsystem: arm port, arm64 port (aarch64 architecture), kasan, risc-v architecture, s390 architecture, tensilica xtensa port (xtensa), the rest, x86 architecture (32-bit and 64-bit), x86 mm · Maintainers: Russell King, Catalin Marinas, Will Deacon, Andrey Ryabinin, Paul Walmsley, Palmer Dabbelt, Albert Ou, Heiko Carstens, Vasily Gorbik, Alexander Gordeev, Chris Zankel, Max Filippov, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, Andy Lutomirski, Peter Zijlstra

Call kasan_init_generic() which handles Generic KASAN initialization.
For architectures that do not select ARCH_DEFER_KASAN,
this will be a no-op for the runtime flag but will
print the initialization banner.

For SW_TAGS and HW_TAGS modes, their respective init functions will
handle the flag enabling, if they are enabled/implemented.

Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217049
Signed-off-by: Sabyrzhan Tasbolatov <redacted>
Tested-by: Alexandre Ghiti <redacted> # riscv
Acked-by: Alexander Gordeev <agordeev@linux.ibm.com> # s390
---
Changes in v6:
- Call kasan_init_generic() in arch/riscv _after_ local_flush_tlb_all()
---
 arch/arm/mm/kasan_init.c    | 2 +-
 arch/arm64/mm/kasan_init.c  | 4 +---
 arch/riscv/mm/kasan_init.c  | 1 +
 arch/s390/kernel/early.c    | 3 ++-
 arch/x86/mm/kasan_init_64.c | 2 +-
 arch/xtensa/mm/kasan_init.c | 2 +-
 6 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c
index 111d4f703136..c6625e808bf8 100644
--- a/arch/arm/mm/kasan_init.c
+++ b/arch/arm/mm/kasan_init.c

@@ -300,6 +300,6 @@ void __init kasan_init(void)
 	local_flush_tlb_all();
 
 	memset(kasan_early_shadow_page, 0, PAGE_SIZE);
-	pr_info("Kernel address sanitizer initialized\n");
 	init_task.kasan_depth = 0;
+	kasan_init_generic();
 }

diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
index d541ce45daeb..abeb81bf6ebd 100644
--- a/arch/arm64/mm/kasan_init.c
+++ b/arch/arm64/mm/kasan_init.c

@@ -399,14 +399,12 @@ void __init kasan_init(void)
 {
 	kasan_init_shadow();
 	kasan_init_depth();
-#if defined(CONFIG_KASAN_GENERIC)
+	kasan_init_generic();
 	/*
 	 * Generic KASAN is now fully initialized.
 	 * Software and Hardware Tag-Based modes still require
 	 * kasan_init_sw_tags() and kasan_init_hw_tags() correspondingly.
 	 */
-	pr_info("KernelAddressSanitizer initialized (generic)\n");
-#endif
 }
 
 #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */

diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
index 41c635d6aca4..c4a2a9e5586e 100644
--- a/arch/riscv/mm/kasan_init.c
+++ b/arch/riscv/mm/kasan_init.c

@@ -533,4 +533,5 @@ void __init kasan_init(void)
 
 	csr_write(CSR_SATP, PFN_DOWN(__pa(swapper_pg_dir)) | satp_mode);
 	local_flush_tlb_all();
+	kasan_init_generic();
 }

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 9adfbdd377dc..544e5403dd91 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c

@@ -21,6 +21,7 @@
 #include <linux/kernel.h>
 #include <asm/asm-extable.h>
 #include <linux/memblock.h>
+#include <linux/kasan.h>
 #include <asm/access-regs.h>
 #include <asm/asm-offsets.h>
 #include <asm/machine.h>

@@ -65,7 +66,7 @@ static void __init kasan_early_init(void)
 {
 #ifdef CONFIG_KASAN
 	init_task.kasan_depth = 0;
-	pr_info("KernelAddressSanitizer initialized\n");
+	kasan_init_generic();
 #endif
 }

diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index 0539efd0d216..998b6010d6d3 100644
--- a/arch/x86/mm/kasan_init_64.c
+++ b/arch/x86/mm/kasan_init_64.c

@@ -451,5 +451,5 @@ void __init kasan_init(void)
 	__flush_tlb_all();
 
 	init_task.kasan_depth = 0;
-	pr_info("KernelAddressSanitizer initialized\n");
+	kasan_init_generic();
 }

diff --git a/arch/xtensa/mm/kasan_init.c b/arch/xtensa/mm/kasan_init.c
index f39c4d83173a..0524b9ed5e63 100644
--- a/arch/xtensa/mm/kasan_init.c
+++ b/arch/xtensa/mm/kasan_init.c

@@ -94,5 +94,5 @@ void __init kasan_init(void)
 
 	/* At this point kasan is fully initialized. Enable error messages. */
 	current->kasan_depth = 0;
-	pr_info("KernelAddressSanitizer initialized\n");
+	kasan_init_generic();
 }

-- 
2.34.1

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