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Shutemov" To: Walter Wu Cc: David Hildenbrand , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Matthias Brugger , Andrew Morton , Martin Schwidefsky , Will Deacon , Andrey Konovalov , Arnd Bergmann , Thomas Gleixner , Michal Hocko , Qian Cai , 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 Subject: Re: [PATCH v2 1/2] mm/page_ext: support to record the last stack of page Message-ID: <20190910093103.4cmqk4semlhgpmle@box.shutemov.name> References: <20190909085339.25350-1-walter-zh.wu@mediatek.com> <36b5a8e0-2783-4c0e-4fc7-78ea652ba475@redhat.com> <1568077669.24886.3.camel@mtksdccf07> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1568077669.24886.3.camel@mtksdccf07> User-Agent: NeoMutt/20180716 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Sep 10, 2019 at 09:07:49AM +0800, Walter Wu wrote: > On Mon, 2019-09-09 at 12:57 +0200, David Hildenbrand wrote: > > On 09.09.19 10:53, Walter Wu wrote: > > > KASAN will record last stack of page in order to help programmer > > > to see memory corruption caused by page. > > > > > > What is difference between page_owner and our patch? > > > page_owner records alloc stack of page, but our patch is to record > > > last stack(it may be alloc or free stack of page). > > > > > > Signed-off-by: Walter Wu > > > --- > > > mm/page_ext.c | 3 +++ > > > 1 file changed, 3 insertions(+) > > > > > > diff --git a/mm/page_ext.c b/mm/page_ext.c > > > index 5f5769c7db3b..7ca33dcd9ffa 100644 > > > --- a/mm/page_ext.c > > > +++ b/mm/page_ext.c > > > @@ -65,6 +65,9 @@ static struct page_ext_operations *page_ext_ops[] = { > > > #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT) > > > &page_idle_ops, > > > #endif > > > +#ifdef CONFIG_KASAN > > > + &page_stack_ops, > > > +#endif > > > }; > > > > > > static unsigned long total_usage; > > > > > > > Are you sure this patch compiles? > > > This is patchsets, it need another patch2. > We have verified it by running KASAN UT on Qemu. Any patchset must be bisectable: do not break anything in the middle of patchset. -- Kirill A. Shutemov