linux-kernel - [PATCH 12/15] x86: Minimal SLAB alignment

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Message-ID: <162610a0af3e04e2f42872401461b1d62ec78fbd.1738686764.git.maciej.wieczor-retman@intel.com>
Date: Tue,  4 Feb 2025 18:33:53 +0100
From: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
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Subject: [PATCH 12/15] x86: Minimal SLAB alignment

Adjust x86 minimal SLAB alignment to match KASAN granularity size. In
tag-based mode the size changes to 16 bytes so the value needs to be 4.

Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
---
 arch/x86/include/asm/kasan.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/include/asm/kasan.h b/arch/x86/include/asm/kasan.h
index 8829337a75fa..f7a8d3763615 100644
--- a/arch/x86/include/asm/kasan.h
+++ b/arch/x86/include/asm/kasan.h
@@ -36,6 +36,8 @@
 
 #ifdef CONFIG_KASAN_SW_TAGS
 
+#define ARCH_SLAB_MINALIGN (1ULL << KASAN_GRANULE_SHIFT)
+
 #define __tag_shifted(tag)		FIELD_PREP(GENMASK_ULL(60, 57), tag)
 #define __tag_reset(addr)		(sign_extend64((u64)(addr), 56))
 #define __tag_get(addr)			((u8)FIELD_GET(GENMASK_ULL(60, 57), (u64)addr))
-- 
2.47.1