linux-kernel - Re: [PATCH v2 1/2] LoongArch: kfence: avoid use CONFIG_KFENCE_NUM

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Message-ID: <CAAhV-H5n_3Ndk5yRm=S-9WktD9xivVF8-JLaycV8JB-pVuybbA@mail.gmail.com>
Date: Fri, 19 Dec 2025 10:13:15 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: yuan linyu <yuanlinyu@...or.com>, Enze Li <lienze@...inos.cn>
Cc: Alexander Potapenko <glider@...gle.com>, Marco Elver <elver@...gle.com>, 
	Dmitry Vyukov <dvyukov@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	WANG Xuerui <kernel@...0n.name>, kasan-dev@...glegroups.com, linux-mm@...ck.org, 
	loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] LoongArch: kfence: avoid use CONFIG_KFENCE_NUM_OBJECTS

Hi, Enze,

On Thu, Dec 18, 2025 at 2:39 PM yuan linyu <yuanlinyu@...or.com> wrote:
>
> use common kfence macro KFENCE_POOL_SIZE for KFENCE_AREA_SIZE definition
>
> Signed-off-by: yuan linyu <yuanlinyu@...or.com>
> ---
>  arch/loongarch/include/asm/pgtable.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h
> index f41a648a3d9e..e9966c9f844f 100644
> --- a/arch/loongarch/include/asm/pgtable.h
> +++ b/arch/loongarch/include/asm/pgtable.h
> @@ -10,6 +10,7 @@
>  #define _ASM_PGTABLE_H
>
>  #include <linux/compiler.h>
> +#include <linux/kfence.h>
>  #include <asm/addrspace.h>
>  #include <asm/asm.h>
>  #include <asm/page.h>
> @@ -96,7 +97,7 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
>  #define MODULES_END    (MODULES_VADDR + SZ_256M)
>
>  #ifdef CONFIG_KFENCE
> -#define KFENCE_AREA_SIZE       (((CONFIG_KFENCE_NUM_OBJECTS + 1) * 2 + 2) * PAGE_SIZE)
> +#define KFENCE_AREA_SIZE       (KFENCE_POOL_SIZE + (2 * PAGE_SIZE))
Can you remember why you didn't use KFENCE_POOL_SIZE at the first place?

Huacai

>  #else
>  #define KFENCE_AREA_SIZE       0
>  #endif
> --
> 2.25.1
>
>