On Thu, Mar 21, 2024 at 09:36:36AM -0700, Suren Baghdasaryan wrote: > +++ b/include/linux/pgalloc_tag.h > @@ -0,0 +1,78 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * page allocation tagging > + */ > +#ifndef _LINUX_PGALLOC_TAG_H > +#define _LINUX_PGALLOC_TAG_H > + > +#include <linux/alloc_tag.h> > + > +#ifdef CONFIG_MEM_ALLOC_PROFILING > + > +#include <linux/page_ext.h> > + > +extern struct page_ext_operations page_alloc_tagging_ops; > +extern struct page_ext *page_ext_get(struct page *page); > +extern void page_ext_put(struct page_ext *page_ext); Why are you duplicating theses two declarations? I just deleted them locally and don't see any build problems. tested with x86-64 defconfig (full build), allnoconfig full build and allmodconfig mm/ and fs/ (nobody has time to build allmodconfig drivers/)