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Message-ID: <1568297308.19040.5.camel@mtksdccf07>
Subject: Re: [PATCH v3] mm/kasan: dump alloc and free stack for page
 allocator
From:   Walter Wu <walter-zh.wu@mediatek.com>
To:     Vlastimil Babka <vbabka@suse.cz>
CC:     Qian Cai <cai@lca.pw>, Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        "Andrew Morton" <akpm@linux-foundation.org>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Andrey Konovalov <andreyknvl@google.com>,
        "Arnd Bergmann" <arnd@arndb.de>, <linux-kernel@vger.kernel.org>,
        <kasan-dev@googlegroups.com>, <linux-mm@kvack.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-mediatek@lists.infradead.org>, <wsd_upstream@mediatek.com>
Date:   Thu, 12 Sep 2019 22:08:28 +0800
In-Reply-To: <c4d2518f-4813-c941-6f47-73897f420517@suse.cz>
References: <20190911083921.4158-1-walter-zh.wu@mediatek.com>
         <5E358F4B-552C-4542-9655-E01C7B754F14@lca.pw>
         <c4d2518f-4813-c941-6f47-73897f420517@suse.cz>
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>  extern void __reset_page_owner(struct page *page, unsigned int order);
> diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
> index 6c9682ce0254..dc560c7562e8 100644
> --- a/lib/Kconfig.kasan
> +++ b/lib/Kconfig.kasan
> @@ -41,6 +41,8 @@ config KASAN_GENERIC
>  	select SLUB_DEBUG if SLUB
>  	select CONSTRUCTORS
>  	select STACKDEPOT
> +	select PAGE_OWNER
> +	select PAGE_OWNER_FREE_STACK
>  	help
>  	  Enables generic KASAN mode.
>  	  Supported in both GCC and Clang. With GCC it requires version 4.9.2
> @@ -63,6 +65,8 @@ config KASAN_SW_TAGS
>  	select SLUB_DEBUG if SLUB
>  	select CONSTRUCTORS
>  	select STACKDEPOT
> +	select PAGE_OWNER
> +	select PAGE_OWNER_FREE_STACK
>  	help

What is the difference between PAGE_OWNER+PAGE_OWNER_FREE_STACK and
DEBUG_PAGEALLOC?
If you directly enable PAGE_OWNER+PAGE_OWNER_FREE_STACK
PAGE_OWNER_FREE_STACK,don't you think low-memory device to want to use
KASAN?