+ kasan-loongarch-call-kasan_init_generic-in-kasan_init.patch added to mm-new branch

+ kasan-loongarch-call-kasan_init_generic-in-kasan_init.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: kasan/loongarch: call kasan_init_generic in kasan_init
has been added to the -mm mm-new branch.  Its filename is
     kasan-loongarch-call-kasan_init_generic-in-kasan_init.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kasan-loongarch-call-kasan_init_generic-in-kasan_init.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
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fixup patches in mm-new.

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------------------------------------------------------
From: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
Subject: kasan/loongarch: call kasan_init_generic in kasan_init
Date: Thu, 26 Jun 2025 20:31:41 +0500

Call kasan_init_generic() which enables the static flag to mark generic
KASAN initialized, otherwise it's an inline stub.

Replace `kasan_arch_is_ready` with `kasan_enabled`.  Delete the flag
`kasan_early_stage` in favor of the global static key enabled via
kasan_enabled().

printk banner is printed earlier right where `kasan_early_stage` was
flipped, just to keep the same flow.

Note that `init_task.kasan_depth = 0;` is called after
`kasan_init_generic()`, which is different than in other arch
`kasan_init()`.  I've left this unchanged as I can't test it.  Defer to
loongarch maintainers.

Link: https://lkml.kernel.org/r/20250626153147.145312-6-snovitoll@gmail.com
Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218315
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/loongarch/include/asm/kasan.h |    7 -------
 arch/loongarch/mm/kasan_init.c     |    7 ++-----
 2 files changed, 2 insertions(+), 12 deletions(-)

--- a/arch/loongarch/include/asm/kasan.h~kasan-loongarch-call-kasan_init_generic-in-kasan_init
+++ a/arch/loongarch/include/asm/kasan.h
@@ -66,7 +66,6 @@
 #define XKPRANGE_WC_SHADOW_OFFSET	(KASAN_SHADOW_START + XKPRANGE_WC_KASAN_OFFSET)
 #define XKVRANGE_VC_SHADOW_OFFSET	(KASAN_SHADOW_START + XKVRANGE_VC_KASAN_OFFSET)
 
-extern bool kasan_early_stage;
 extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
 
 #define kasan_mem_to_shadow kasan_mem_to_shadow
@@ -75,12 +74,6 @@ void *kasan_mem_to_shadow(const void *ad
 #define kasan_shadow_to_mem kasan_shadow_to_mem
 const void *kasan_shadow_to_mem(const void *shadow_addr);
 
-#define kasan_arch_is_ready kasan_arch_is_ready
-static __always_inline bool kasan_arch_is_ready(void)
-{
-	return !kasan_early_stage;
-}
-
 #define addr_has_metadata addr_has_metadata
 static __always_inline bool addr_has_metadata(const void *addr)
 {
--- a/arch/loongarch/mm/kasan_init.c~kasan-loongarch-call-kasan_init_generic-in-kasan_init
+++ a/arch/loongarch/mm/kasan_init.c
@@ -40,11 +40,9 @@ static pgd_t kasan_pg_dir[PTRS_PER_PGD]
 #define __pte_none(early, pte) (early ? pte_none(pte) : \
 ((pte_val(pte) & _PFN_MASK) == (unsigned long)__pa(kasan_early_shadow_page)))
 
-bool kasan_early_stage = true;
-
 void *kasan_mem_to_shadow(const void *addr)
 {
-	if (!kasan_arch_is_ready()) {
+	if (!kasan_enabled()) {
 		return (void *)(kasan_early_shadow_page);
 	} else {
 		unsigned long maddr = (unsigned long)addr;
@@ -298,7 +296,7 @@ void __init kasan_init(void)
 	kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_START),
 					kasan_mem_to_shadow((void *)KFENCE_AREA_END));
 
-	kasan_early_stage = false;
+	kasan_init_generic();
 
 	/* Populate the linear mapping */
 	for_each_mem_range(i, &pa_start, &pa_end) {
@@ -329,5 +327,4 @@ void __init kasan_init(void)
 
 	/* At this point kasan is fully initialized. Enable error messages */
 	init_task.kasan_depth = 0;
-	pr_info("KernelAddressSanitizer initialized.\n");
 }
_

Patches currently in -mm which might be from snovitoll@gmail.com are

mm-unexport-globally-copy_to_kernel_nofault.patch
mm-unexport-globally-copy_to_kernel_nofault-v2.patch
kasan-unify-static-kasan_flag_enabled-across-modes.patch
kasan-arm64-call-kasan_init_generic-in-kasan_init.patch
kasan-arm-call-kasan_init_generic-in-kasan_init.patch
kasan-xtensa-call-kasan_init_generic-in-kasan_init.patch
kasan-loongarch-call-kasan_init_generic-in-kasan_init.patch
kasan-um-call-kasan_init_generic-in-kasan_init.patch
kasan-x86-call-kasan_init_generic-in-kasan_init.patch
kasan-s390-call-kasan_init_generic-in-kasan_init.patch
kasan-powerpc-call-kasan_init_generic-in-kasan_init.patch
kasan-riscv-call-kasan_init_generic-in-kasan_init.patch
kasan-replace-kasan_arch_is_ready-with-kasan_enabled.patch