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Mon, 02 Sep 2019 14:28:12 -0700 (PDT) MIME-Version: 1.0 References: <20190830035716.GA190684@LGEARND20B15> <20190830135007.8b5949bd57975d687ff0a3f8@linux-foundation.org> In-Reply-To: <20190830135007.8b5949bd57975d687ff0a3f8@linux-foundation.org> From: Austin Kim Date: Tue, 3 Sep 2019 06:28:08 +0900 Message-ID: Subject: Re: [PATCH] mm/vmalloc: move 'area->pages' after if statement To: Andrew Morton Cc: urezki@gmail.com, guro@fb.com, rpenyaev@suse.de, mhocko@suse.com, rick.p.edgecombe@intel.com, rppt@linux.ibm.com, aryabinin@virtuozzo.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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: 2019=EB=85=84 8=EC=9B=94 31=EC=9D=BC (=ED=86=A0) =EC=98=A4=EC=A0=84 5:50, A= ndrew Morton =EB=8B=98=EC=9D=B4 =EC=9E=91=EC=84= =B1: > > On Fri, 30 Aug 2019 12:57:16 +0900 Austin Kim wr= ote: > > > If !area->pages statement is true where memory allocation fails, > > area is freed. > > > > In this case 'area->pages =3D pages' should not executed. > > So move 'area->pages =3D pages' after if statement. > > > > ... > > > > --- a/mm/vmalloc.c > > +++ b/mm/vmalloc.c > > @@ -2416,13 +2416,15 @@ static void *__vmalloc_area_node(struct vm_stru= ct *area, gfp_t gfp_mask, > > } else { > > pages =3D kmalloc_node(array_size, nested_gfp, node); > > } > > - area->pages =3D pages; > > - if (!area->pages) { > > + > > + if (!pages) { > > remove_vm_area(area->addr); > > kfree(area); > > return NULL; > > } > > > > + area->pages =3D pages; > > + > > for (i =3D 0; i < area->nr_pages; i++) { > > struct page *page; > > > > Fair enough. But we can/should also do this? I agreed since it is the same treatment. Thanks for feedback. > > --- a/mm/vmalloc.c~mm-vmalloc-move-area-pages-after-if-statement-fix > +++ a/mm/vmalloc.c > @@ -2409,7 +2409,6 @@ static void *__vmalloc_area_node(struct > nr_pages =3D get_vm_area_size(area) >> PAGE_SHIFT; > array_size =3D (nr_pages * sizeof(struct page *)); > > - area->nr_pages =3D nr_pages; > /* Please note that the recursion is strictly bounded. */ > if (array_size > PAGE_SIZE) { > pages =3D __vmalloc_node(array_size, 1, nested_gfp|highme= m_mask, > @@ -2425,6 +2424,7 @@ static void *__vmalloc_area_node(struct > } > > area->pages =3D pages; > + area->nr_pages =3D nr_pages; > > for (i =3D 0; i < area->nr_pages; i++) { > struct page *page; > _ >