From: Huacai Chen Date: Wed, 23 Oct 2024 14:15:30 +0000 (+0800) Subject: LoongArch: Make KASAN usable for variable cpu_vabits X-Git-Tag: microblaze-v6.16~831^2~1 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=3c252263be801f937f56b4bcd8e8e2b5307c1ce5;p=linux-2.6-microblaze.git LoongArch: Make KASAN usable for variable cpu_vabits Currently, KASAN on LoongArch assume the CPU VA bits is 48, which is true for Loongson-3 series, but not for Loongson-2 series (only 40 or lower), this patch fix that issue and make KASAN usable for variable cpu_vabits. Solution is very simple: Just define XRANGE_SHADOW_SHIFT which means valid address length from VA_BITS to min(cpu_vabits, VA_BITS). Cc: stable@vger.kernel.org Signed-off-by: Kanglong Wang Signed-off-by: Huacai Chen --- diff --git a/arch/loongarch/include/asm/kasan.h b/arch/loongarch/include/asm/kasan.h index cd6084f4e153..c6bce5fbff57 100644 --- a/arch/loongarch/include/asm/kasan.h +++ b/arch/loongarch/include/asm/kasan.h @@ -16,7 +16,7 @@ #define XRANGE_SHIFT (48) /* Valid address length */ -#define XRANGE_SHADOW_SHIFT (PGDIR_SHIFT + PAGE_SHIFT - 3) +#define XRANGE_SHADOW_SHIFT min(cpu_vabits, VA_BITS) /* Used for taking out the valid address */ #define XRANGE_SHADOW_MASK GENMASK_ULL(XRANGE_SHADOW_SHIFT - 1, 0) /* One segment whole address space size */