Re: [PATCH v3 07/12] kasan/loongarch: select ARCH_DEFER_KASAN and call kasan_init_generic

From: Andrey Ryabinin <ryabinin.a.a@gmail.com>
To: Sabyrzhan Tasbolatov <snovitoll@gmail.com>,
	hca@linux.ibm.com, christophe.leroy@csgroup.eu,
	andreyknvl@gmail.com, agordeev@linux.ibm.com,
	akpm@linux-foundation.org
Cc: glider@google.com, dvyukov@google.com,
	kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org,
	loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org,
	linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
	linux-um@lists.infradead.org, linux-mm@kvack.org
Subject: Re: [PATCH v3 07/12] kasan/loongarch: select ARCH_DEFER_KASAN and call kasan_init_generic
Date: Tue, 22 Jul 2025 00:59:56 +0200	[thread overview]
Message-ID: <c8b0be89-6c89-46ed-87c3-8905b6ccbbeb@gmail.com> (raw)
In-Reply-To: <20250717142732.292822-8-snovitoll@gmail.com>

On 7/17/25 4:27 PM, Sabyrzhan Tasbolatov wrote:

> diff --git a/arch/loongarch/include/asm/kasan.h b/arch/loongarch/include/asm/kasan.h
> index 62f139a9c87..0e50e5b5e05 100644
> --- a/arch/loongarch/include/asm/kasan.h
> +++ b/arch/loongarch/include/asm/kasan.h
> @@ -66,7 +66,6 @@
>  #define XKPRANGE_WC_SHADOW_OFFSET	(KASAN_SHADOW_START + XKPRANGE_WC_KASAN_OFFSET)
>  #define XKVRANGE_VC_SHADOW_OFFSET	(KASAN_SHADOW_START + XKVRANGE_VC_KASAN_OFFSET)
>  
> -extern bool kasan_early_stage;
>  extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
>  
>  #define kasan_mem_to_shadow kasan_mem_to_shadow
> @@ -75,12 +74,6 @@ void *kasan_mem_to_shadow(const void *addr);
>  #define kasan_shadow_to_mem kasan_shadow_to_mem
>  const void *kasan_shadow_to_mem(const void *shadow_addr);
>  
> -#define kasan_arch_is_ready kasan_arch_is_ready
> -static __always_inline bool kasan_arch_is_ready(void)
> -{
> -	return !kasan_early_stage;
> -}
> -
>  #define addr_has_metadata addr_has_metadata
>  static __always_inline bool addr_has_metadata(const void *addr)
>  {
> diff --git a/arch/loongarch/mm/kasan_init.c b/arch/loongarch/mm/kasan_init.c
> index d2681272d8f..cf8315f9119 100644
> --- a/arch/loongarch/mm/kasan_init.c
> +++ b/arch/loongarch/mm/kasan_init.c
> @@ -40,11 +40,9 @@ static pgd_t kasan_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
>  #define __pte_none(early, pte) (early ? pte_none(pte) : \
>  ((pte_val(pte) & _PFN_MASK) == (unsigned long)__pa(kasan_early_shadow_page)))
>  
> -bool kasan_early_stage = true;
> -
>  void *kasan_mem_to_shadow(const void *addr)
>  {
> -	if (!kasan_arch_is_ready()) {
> +	if (!kasan_enabled()) {

This doesn't make sense, !kasan_enabled() is compile-time check which is always false here.

>  		return (void *)(kasan_early_shadow_page);
>  	} else {
>  		unsigned long maddr = (unsigned long)addr;

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