linux-kernel - [PATCH mm] xtensa, kasan: define KASAN_SHADOW

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Date: Mon, 25 Dec 2023 16:19:24 +0100
From: andrey.konovalov@...ux.dev
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andrey Konovalov <andreyknvl@...il.com>,
	Marco Elver <elver@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	kasan-dev@...glegroups.com,
	linux-mm@...ck.org,
	Chris Zankel <chris@...kel.net>,
	Max Filippov <jcmvbkbc@...il.com>,
	linux-kernel@...r.kernel.org,
	Andrey Konovalov <andreyknvl@...gle.com>,
	kernel test robot <lkp@...el.com>
Subject: [PATCH mm] xtensa, kasan: define KASAN_SHADOW_END

From: Andrey Konovalov <andreyknvl@...gle.com>

Common KASAN code might rely on the definitions of the shadow mapping
start, end, and size. Define KASAN_SHADOW_END in addition to
KASAN_SHADOW_START and KASAN_SHADOW_SIZE.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202312240755.MqsWuTno-lkp@intel.com/
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>

---

Andrew, please put this patch before
"kasan: improve kasan_non_canonical_hook".
---
 arch/xtensa/include/asm/kasan.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/xtensa/include/asm/kasan.h b/arch/xtensa/include/asm/kasan.h
index 216b6f32c375..8d2b4248466f 100644
--- a/arch/xtensa/include/asm/kasan.h
+++ b/arch/xtensa/include/asm/kasan.h
@@ -18,6 +18,8 @@
 #define KASAN_SHADOW_START (XCHAL_PAGE_TABLE_VADDR + XCHAL_PAGE_TABLE_SIZE)
 /* Size of the shadow map */
 #define KASAN_SHADOW_SIZE (-KASAN_START_VADDR >> KASAN_SHADOW_SCALE_SHIFT)
+/* End of the shadow map */
+#define KASAN_SHADOW_END (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
 /* Offset for mem to shadow address transformation */
 #define KASAN_SHADOW_OFFSET __XTENSA_UL_CONST(CONFIG_KASAN_SHADOW_OFFSET)
 
-- 
2.25.1