linux-kernel - Re: [PATCH v6 1/2] kasan: introduce ARCH_DEFER

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Message-ID: <CA+fCnZdkHATBYG4RJ8rR8MciKmeV4QGwVwoQjkhc-O_igpUBTQ@mail.gmail.com>
Date: Wed, 3 Sep 2025 15:01:40 +0200
From: Andrey Konovalov <andreyknvl@...il.com>
To: Sabyrzhan Tasbolatov <snovitoll@...il.com>
Cc: ryabinin.a.a@...il.com, christophe.leroy@...roup.eu, bhe@...hat.com, 
	hca@...ux.ibm.com, akpm@...ux-foundation.org, zhangqing@...ngson.cn, 
	chenhuacai@...ngson.cn, davidgow@...gle.com, glider@...gle.com, 
	dvyukov@...gle.com, alexghiti@...osinc.com, alex@...ti.fr, 
	agordeev@...ux.ibm.com, vincenzo.frascino@....com, elver@...gle.com, 
	kasan-dev@...glegroups.com, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, loongarch@...ts.linux.dev, 
	linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org, 
	linux-s390@...r.kernel.org, linux-um@...ts.infradead.org, linux-mm@...ck.org
Subject: Re: [PATCH v6 1/2] kasan: introduce ARCH_DEFER_KASAN and unify static
 key across modes

On Wed, Sep 3, 2025 at 3:00 PM Andrey Konovalov <andreyknvl@...il.com> wrote:
>
> > +void __kasan_save_free_info(struct kmem_cache *cache, void *object);
> > +static inline void kasan_save_free_info(struct kmem_cache *cache, void *object)
> > +{
> > +       if (kasan_enabled())
> > +               __kasan_save_free_info(cache, object);
> > +}
>
> What I meant with these __wrappers was that we should add them for the
> KASAN hooks that are called from non-KASAN code (i.e. for the hooks
> defined in include/linux/kasan.h). And then move all the
> kasan_enabled() checks from mm/kasan/* to where the wrappers are
> defined in include/linux/kasan.h (see kasan_unpoison_range() as an
> example).
>
> kasan_save_free_info is a KASAN internal function that should need
> such a wrapper.

... should _not_ need ...

>
> For now, to make these patches simpler, you can keep kasan_enabled()
> checks in mm/kasan/*, where they are now. Later we can move them to
> include/linux/kasan.h with a separate patch.