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Date: Mon, 7 Mar 2022 00:52:48 +0100 From: Marco Elver <elver@...gle.com> To: Tianchen Ding <dtcccc@...ux.alibaba.com> Cc: Alexander Potapenko <glider@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>, kasan-dev@...glegroups.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2 2/2] kfence: Alloc kfence_pool after system startup On Sat, 5 Mar 2022 at 15:49, Tianchen Ding <dtcccc@...ux.alibaba.com> wrote: [...] > +static int kfence_init_late(void) > +{ > + const unsigned long nr_pages = KFENCE_POOL_SIZE / PAGE_SIZE; > + struct page *pages; > + > + pages = alloc_contig_pages(nr_pages, GFP_KERNEL, first_online_node, NULL); > mm/kfence/core.c:836:17: error: implicit declaration of function ‘alloc_contig_pages’ [-Werror=implicit-function-declaration] This doesn't build without CMA. See ifdef CONFIG_CONTIG_ALLOC in gfp.h, which declares alloc_contig_pages. Will alloc_pages() work as you expect? If so, perhaps only use alloc_contig_pages() #ifdef CONFIG_CONTIG_ALLOC. Thanks, -- Marco
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