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Message-Id: <20250805142622.560992-3-snovitoll@gmail.com>
Date: Tue, 5 Aug 2025 19:26:15 +0500
From: Sabyrzhan Tasbolatov <snovitoll@...il.com>
To: ryabinin.a.a@...il.com,
hca@...ux.ibm.com,
christophe.leroy@...roup.eu,
andreyknvl@...il.com,
agordeev@...ux.ibm.com,
akpm@...ux-foundation.org,
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chenhuacai@...ngson.cn,
trishalfonso@...gle.com,
davidgow@...gle.com
Cc: glider@...gle.com,
dvyukov@...gle.com,
kasan-dev@...glegroups.com,
linux-kernel@...r.kernel.org,
loongarch@...ts.linux.dev,
linuxppc-dev@...ts.ozlabs.org,
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snovitoll@...il.com
Subject: [PATCH v4 2/9] kasan/powerpc: select ARCH_DEFER_KASAN and call kasan_init_generic
PowerPC with radix MMU is the primary architecture that needs deferred
KASAN initialization, as it requires complex shadow memory setup before
KASAN can be safely enabled.
Select ARCH_DEFER_KASAN for PPC_RADIX_MMU to enable the static key
mechanism for runtime KASAN control. Other PowerPC configurations
(like book3e and 32-bit) can enable KASAN early and will use
compile-time constants instead.
Remove the PowerPC-specific static key and kasan_arch_is_ready()
implementation in favor of the unified interface.
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217049
Fixes: 55d77bae7342 ("kasan: fix Oops due to missing calls to kasan_arch_is_ready()")
Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@...il.com>
---
arch/powerpc/Kconfig | 1 +
arch/powerpc/include/asm/kasan.h | 12 ------------
arch/powerpc/mm/kasan/init_32.c | 2 +-
arch/powerpc/mm/kasan/init_book3e_64.c | 2 +-
arch/powerpc/mm/kasan/init_book3s_64.c | 6 +-----
5 files changed, 4 insertions(+), 19 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 93402a1d9c9..11c8ef2d88e 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -122,6 +122,7 @@ config PPC
# Please keep this list sorted alphabetically.
#
select ARCH_32BIT_OFF_T if PPC32
+ select ARCH_DEFER_KASAN if PPC_RADIX_MMU
select ARCH_DISABLE_KASAN_INLINE if PPC_RADIX_MMU
select ARCH_DMA_DEFAULT_COHERENT if !NOT_COHERENT_CACHE
select ARCH_ENABLE_MEMORY_HOTPLUG
diff --git a/arch/powerpc/include/asm/kasan.h b/arch/powerpc/include/asm/kasan.h
index b5bbb94c51f..957a57c1db5 100644
--- a/arch/powerpc/include/asm/kasan.h
+++ b/arch/powerpc/include/asm/kasan.h
@@ -53,18 +53,6 @@
#endif
#ifdef CONFIG_KASAN
-#ifdef CONFIG_PPC_BOOK3S_64
-DECLARE_STATIC_KEY_FALSE(powerpc_kasan_enabled_key);
-
-static __always_inline bool kasan_arch_is_ready(void)
-{
- if (static_branch_likely(&powerpc_kasan_enabled_key))
- return true;
- return false;
-}
-
-#define kasan_arch_is_ready kasan_arch_is_ready
-#endif
void kasan_early_init(void);
void kasan_mmu_init(void);
diff --git a/arch/powerpc/mm/kasan/init_32.c b/arch/powerpc/mm/kasan/init_32.c
index 03666d790a5..1d083597464 100644
--- a/arch/powerpc/mm/kasan/init_32.c
+++ b/arch/powerpc/mm/kasan/init_32.c
@@ -165,7 +165,7 @@ void __init kasan_init(void)
/* At this point kasan is fully initialized. Enable error messages */
init_task.kasan_depth = 0;
- pr_info("KASAN init done\n");
+ kasan_init_generic();
}
void __init kasan_late_init(void)
diff --git a/arch/powerpc/mm/kasan/init_book3e_64.c b/arch/powerpc/mm/kasan/init_book3e_64.c
index 60c78aac0f6..0d3a73d6d4b 100644
--- a/arch/powerpc/mm/kasan/init_book3e_64.c
+++ b/arch/powerpc/mm/kasan/init_book3e_64.c
@@ -127,7 +127,7 @@ void __init kasan_init(void)
/* Enable error messages */
init_task.kasan_depth = 0;
- pr_info("KASAN init done\n");
+ kasan_init_generic();
}
void __init kasan_late_init(void) { }
diff --git a/arch/powerpc/mm/kasan/init_book3s_64.c b/arch/powerpc/mm/kasan/init_book3s_64.c
index 7d959544c07..dcafa641804 100644
--- a/arch/powerpc/mm/kasan/init_book3s_64.c
+++ b/arch/powerpc/mm/kasan/init_book3s_64.c
@@ -19,8 +19,6 @@
#include <linux/memblock.h>
#include <asm/pgalloc.h>
-DEFINE_STATIC_KEY_FALSE(powerpc_kasan_enabled_key);
-
static void __init kasan_init_phys_region(void *start, void *end)
{
unsigned long k_start, k_end, k_cur;
@@ -92,11 +90,9 @@ void __init kasan_init(void)
*/
memset(kasan_early_shadow_page, 0, PAGE_SIZE);
- static_branch_inc(&powerpc_kasan_enabled_key);
-
/* Enable error messages */
init_task.kasan_depth = 0;
- pr_info("KASAN init done\n");
+ kasan_init_generic();
}
void __init kasan_early_init(void) { }
--
2.34.1
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