From nobody Mon Sep 28 04:49:01 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id EDE3A41BA9B; Wed, 26 Aug 2026 12:25:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787747111; cv=none; b=ht91S4omENS0UJAAeStPQKRFMO+Ei7u8QrEZ1ReB6nVVPUxGLuroKM/iOr5JE3DS57l43/cAo99y1b7N+p1Ne8ZvggPbQnL8M41clDF/0PcqWHPzuCkfSeL8Yerye2VH+a5diBAMVYVd0kw272kt/7Ouv/UlFmteEb6rCer36G4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787747111; c=relaxed/simple; bh=GvQPZ0sVbuduLvQoOF9zM5jXfFX1CSDKvuBA3qmf1I8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=sS9nG0AnWJzwBiWUWZaY9iM1NIYVV1C5kOItKRsnt8MKldTwXo692hO/whkW2I4hmk/VF5wGlkqXx76a1AQGKBH16+FQI82UKSzweu0qQ19MbFlSjgpMiThqOfudMNouat+wU6rZ6pSLtVg3XiJGVhke5p0A8axPuVdsHesnGy8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=uQ4oK8Tl; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="uQ4oK8Tl" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5151E1596; Wed, 26 Aug 2026 05:25:03 -0700 (PDT) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 313D83F7D8; Wed, 26 Aug 2026 05:25:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1787747107; bh=GvQPZ0sVbuduLvQoOF9zM5jXfFX1CSDKvuBA3qmf1I8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=uQ4oK8TlYljFlraHfvdRd7Krim8N2tNZDk2qqEs+rKXm1fpcULodS+jTeipE4lc2N HMaynMo8ScJfqIL5txZ4T48K+OCtjAS3KEcQZGDAsXRBzmFRzGuKVxtYd+njkqSBBr gst23nZKEvCkrc5DdiopebD9VDTrtXgc5SVnidQA= From: Yeoreum Yun Date: Wed, 26 Aug 2026 13:24:39 +0100 Subject: [PATCH v2 1/2] kselftest: mm: prevent random failure of huge page split for khugepaged Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260826-fix_split-v2-1-71153c7f579a@arm.com> References: <20260826-fix_split-v2-0-71153c7f579a@arm.com> In-Reply-To: <20260826-fix_split-v2-0-71153c7f579a@arm.com> To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , Kevin Brodsky Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Yeoreum Yun X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2698; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=GvQPZ0sVbuduLvQoOF9zM5jXfFX1CSDKvuBA3qmf1I8=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqjtsbim5lcCrKm1NTonGxRpo+/uWXYt6fnVqSW 2zH3AZ2+mCJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCao7bGwAKCRBt1cPRWsUx Mwl1C/9wWoLo2TBd76OtUebEOO9bmK1IDPaAImCIYUhdFcULi+QtYiaD5Dv95d2w/ur8IbUve0/ H1XJHff2OIt+Cggqmtqw128mL2F0wo+Ak2JZVW1KB0oc8lsbyMHXDswwrZb0lkBh+0IiT5Ne7YT XyWGemLyMoggKrStCYhAzx8H4sr4VrxcNAccO8j6O0VFuSW3sgpMTBNRUhhfMUQYkmwiZPMdXO8 T5/MIBY4rMwZNSg6ouXnHnjQG3F6eFj70MDP7EWR3OijfONE9hx4JIcOGtxEka+E9mizpeb26JB ehhQPMO0HbnfXVEWvsaRprxpwpckBw4s5L0mqQAqmNgcJLUIUsMEtBwToVd8lDBxN3szlymtN54 FKJ3ajlgig/fmTN3Mu/I0vBW8wfk37ly69RS90mhuL5kysqhLDErYPnXRWKTBuLBn0AGEIG0AhK /S6GF2qbFCM5LXkiORwjKDIqJLKgTnL8xI4evcfrQX8SFj+13hXf6XWXjbOXX0qRKgRc8= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 There're some random failure for split_huge_page_test when khugepaged collapses pages into pmd again which had split by the test. Prevent the khugepaged's collapses for split page by setting the mapped pmd-huge-page with MADV_NOHUGEPAGE before split. Reported-by: Kevin Brodsky Reviewed-by: Zi Yan Signed-off-by: Yeoreum Yun --- tools/testing/selftests/mm/split_huge_page_test.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/test= ing/selftests/mm/split_huge_page_test.c index 86a603692826..8f68bc94a5ca 100644 --- a/tools/testing/selftests/mm/split_huge_page_test.c +++ b/tools/testing/selftests/mm/split_huge_page_test.c @@ -180,6 +180,10 @@ static void verify_rss_anon_split_huge_page_all_zeroes= (char *one_page, int nr_hp if (!rss_anon_before) ksft_exit_fail_msg("No RssAnon is allocated before split\n"); =20 + /* Prevent khugepaged from collapsing the pages. */ + if (madvise(one_page, len, MADV_NOHUGEPAGE)) + ksft_print_msg("MADV_NOHUGEPAGE failed to prevent khugepaged from collap= sing pages.\n"); + /* split all THPs */ write_debugfs(PID_FMT, getpid(), (uint64_t)one_page, (uint64_t)one_page + len, 0); @@ -227,6 +231,10 @@ static void split_pmd_thp_to_order(int order) if (!check_huge_anon(one_page, 4 * pmd_pagesize, 4, pmd_pagesize)) ksft_exit_fail_msg("No THP is allocated\n"); =20 + /* Prevent khugepaged from collapsing the pages. */ + if (madvise(one_page, len, MADV_NOHUGEPAGE)) + ksft_print_msg("MADV_NOHUGEPAGE failed to prevent khugepaged from collap= sing pages.\n"); + /* split all THPs */ write_debugfs(PID_FMT, getpid(), (uint64_t)one_page, (uint64_t)one_page + len, order); @@ -313,6 +321,10 @@ static void split_pte_mapped_thp(void) goto out; } =20 + /* Prevent khugepaged from collapsing the pages. */ + if (madvise(thp_area, thp_area_size, MADV_NOHUGEPAGE)) + ksft_print_msg("MADV_NOHUGEPAGE failed to prevent khugepaged from collap= sing pages.\n"); + /* Split all THPs through the remapped pages. */ write_debugfs(PID_FMT, getpid(), (uint64_t)page_area, (uint64_t)page_area + page_area_size, 0); @@ -542,6 +554,9 @@ static int create_pagecache_thp_and_fd(const char *test= file, size_t fd_size, ksft_test_result_skip("Pagecache folio split skipped\n"); return -2; } + /* Prevent khugepaged from collapsing the pages. */ + if (madvise(*addr, fd_size, MADV_NOHUGEPAGE)) + ksft_print_msg("MADV_NOHUGEPAGE failed to prevent khugepaged from collap= sing pages.\n"); return 0; err_out_close: close(*fd); --=20 2.43.0 From nobody Mon Sep 28 04:49:01 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 204A841A914; Wed, 26 Aug 2026 12:25:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787747113; cv=none; b=qso4K9p1g4Y3da8SOuLM56m6UmH8TwlMoTTNzXQOKTf53Ahq/CJs3mTaXmHw/CSIkkKKoF9J16lrNqeytR/a3Jfcap8+6qG4n6r5iBuTtsCKJ9fSn1ttP5YyQEfzIt0QSdaPUOFMpN7Mz71z/f3tZOq6qrHKruubDpRdnVffwbA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787747113; c=relaxed/simple; bh=j7yzn2+ip7gaDbogI2HF7uGqF+si9ui1mIt3+JN8ZOo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=KHWzPdqBZm47tgd5xXgpfvuGwML1y94wJPDy8dgRF+frSWb4VwNXKV8veB89fGvNAHsAiPRSQYHAOrI0Y3br7zgi15QulyOFLu6W7/46XMqpwyh0lhr+M9oBJlIL4ikN7bzN5ftvsY87ko0FvqIgFWioqI/ekcOW7RAoP6vSjL8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=gLcxi1GC; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="gLcxi1GC" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 96DE41713; Wed, 26 Aug 2026 05:25:06 -0700 (PDT) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 73DA93F7D8; Wed, 26 Aug 2026 05:25:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1787747110; bh=j7yzn2+ip7gaDbogI2HF7uGqF+si9ui1mIt3+JN8ZOo=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=gLcxi1GCoNWa/KSQheBTpWMJnIXEejun7+7KuWg4y2JktPJW5wDFYyP2OSk5yzsI2 geDvUhCW+qtcSlo21nDzy6QssLvr+yVHB0zozWBIeYtrir+W1zVTZUrXurz/1FN/fv wS3PtMHvgpU3Y6BCLoc5N1mUxq9Z6AWw9/SZbjnY= From: Yeoreum Yun Date: Wed, 26 Aug 2026 13:24:40 +0100 Subject: [PATCH v2 2/2] kselftest: mm: replace usage of /proc/self/smaps for check_huge_xxx() helper Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260826-fix_split-v2-2-71153c7f579a@arm.com> References: <20260826-fix_split-v2-0-71153c7f579a@arm.com> In-Reply-To: <20260826-fix_split-v2-0-71153c7f579a@arm.com> To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , Kevin Brodsky Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Yeoreum Yun X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=7240; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=j7yzn2+ip7gaDbogI2HF7uGqF+si9ui1mIt3+JN8ZOo=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqjtscnI2PSSpeC1NV+a49cQWW7aq4gHufdTP8r IT22MsqHWeJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCao7bHAAKCRBt1cPRWsUx M3fwC/4wN69ja0RsRNlDZHSVZ1KLLaJerixhWSAn2QGJky3iQYr7Nmr/KfCO9EO2p+5BMPHtsNM 5bFtLeY4VLCTTva5wuqXN55dxhzXvUptRLTdqRuYArp6hYS+1YfV5+Fk1PFWeGo0swETkD+NobW HiwGc7Xl6//VzPS37TkZmGcNs70QSGTz0RdyoNO3ieDMWSaBKY4IA4u7LqmHiIcCjtuzhceuL0V beVaDwYrJ+pHKOruVf9lAw9xrp0OBFeHSsZsPAeICLDPb3YF4ymk/Ymbn8sXCCOahTu+lO+yHIq NGzRKiKKdcn7lEOKIRxu0MXwysRSOIqrvKHpLQBFRN6XeduwqgfN5Q2004vVy2taCvqyLWlJvdh Q+pcnpcC0DsN18ah425OdQgNrLGQZuicKuHtbkN/vyA9S3Ek5IA4DR8kC3A1K86GNP5tYoqSKqR peOwxfk74qa27301wE0rSYMMtNFqErfapa3P6IrRbDE3ipRlB4wNA4KsBm83Vd0FwuZUg= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 Since glibc commit 321e1fc73f (=E2=80=9Cmalloc: Enable 2MB THP by default o= n AArch64=E2=80=9D), glibc may call madvise(MADV_HUGEPAGE) for sufficiently large allocations made by memalign(). The underlying VMA may start at a different address from the aligned address returned by memalign(). Furthermore, a subsequent madvise(MADV_HUGEPAGE) call does not split the VMA because the flag is already set. This causes split_huge_page_test to fail because the check_huge_xxx() helpers incorrectly require the address returned by memalign() to match the VMA start address reported in /proc/self/smaps. Fix this by using /proc/self/pagemap and /proc/kpageflags instead of /proc/self/smaps to detect huge pages. Reported-by: David Hildenbrand (Arm) Signed-off-by: Yeoreum Yun --- tools/testing/selftests/mm/vm_util.c | 130 ++++++++++++++++++++-----------= ---- tools/testing/selftests/mm/vm_util.h | 1 + 2 files changed, 77 insertions(+), 54 deletions(-) diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests= /mm/vm_util.c index 4821a3563036..1d0959b3b9e8 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -351,31 +351,13 @@ char *__get_smap_entry(void *addr, const char *patter= n, char *buf, size_t len) return entry; } =20 -static bool __check_pmd_huge(void *addr, char *pattern, int nr_hpages, - uint64_t hpage_size) -{ - char buffer[MAX_LINE_LENGTH]; - uint64_t thp =3D -1; - char *entry; - - entry =3D __get_smap_entry(addr, pattern, buffer, sizeof(buffer)); - if (!entry) - goto err_out; - - if (sscanf(entry, "%9" SCNu64 " kB", &thp) !=3D 1) - ksft_exit_fail_msg("Reading smap error\n"); - -err_out: - return thp =3D=3D (nr_hpages * (hpage_size >> 10)); -} - -static bool check_large_folios(void *addr, size_t len, int nr_hpages, - uint64_t hpage_size) +static bool check_large_folios(int pagemap_fd, int kpageflags_fd, + void *addr, size_t len, int nr_hpages, + uint64_t hpage_size) { int order =3D 0, pagesize =3D getpagesize(); unsigned int nr_pages =3D hpage_size / pagesize; int orders[MAX_NR_ORDERS], status; - int pagemap_fd, kpageflags_fd; bool ret =3D false; =20 if (!nr_pages) @@ -386,15 +368,6 @@ static bool check_large_folios(void *addr, size_t len,= int nr_hpages, ksft_exit_fail_msg("invalid order\n"); =20 memset(orders, 0, sizeof(int) * MAX_NR_ORDERS); - pagemap_fd =3D open(PAGEMAP_PATH, O_RDONLY); - if (pagemap_fd =3D=3D -1) - ksft_exit_fail_msg("read pagemap fail\n"); - - kpageflags_fd =3D open(KPAGEFLAGS_PATH, O_RDONLY); - if (kpageflags_fd =3D=3D -1) { - close(pagemap_fd); - ksft_exit_fail_msg("read kpageflags fail\n"); - } =20 status =3D gather_folio_orders(addr, len, pagemap_fd, kpageflags_fd, orders, MAX_NR_ORDERS); @@ -405,48 +378,97 @@ static bool check_large_folios(void *addr, size_t len= , int nr_hpages, ret =3D true; =20 out: - close(pagemap_fd); - close(kpageflags_fd); return ret; } =20 -bool check_huge_anon(void *addr, size_t len, int nr_hpages, uint64_t hpage= _size) +enum check_huge_type { + CHECK_HUGE_ANON, + CHECK_HUGE_FILE, + CHECK_HUGE_SHMEM, +}; + +static bool __check_pmd_huge(void *addr, size_t len, int nr_hpages, + uint64_t hpage_size, enum check_huge_type type) { - uint64_t pmd_pagesize =3D read_pmd_pagesize(); + int pagemap_fd, kpageflags_fd; + uint64_t pmd_pagesize, granule; + uint64_t categories, kpf; + unsigned long pfn; + bool check_large, huge_mapped; + char *start =3D addr; + char *end =3D start + len; =20 + pmd_pagesize =3D read_pmd_pagesize(); if (!pmd_pagesize) ksft_exit_fail_msg("reading PMD pagesize failed\n"); =20 - if (hpage_size =3D=3D pmd_pagesize) - return __check_pmd_huge(addr, "AnonHugePages: ", nr_hpages, hpage_size); + if (nr_hpages > 0) { + check_large =3D true; + granule =3D hpage_size; + } else { + check_large =3D false; + granule =3D psize(); + } =20 - return check_large_folios(addr, len, nr_hpages, hpage_size); -} + pagemap_fd =3D open(PAGEMAP_PATH, O_RDONLY); + if (pagemap_fd < 0) + ksft_exit_fail_msg("open pagemap fail\n"); =20 -bool check_huge_file(void *addr, size_t len, int nr_hpages, uint64_t hpage= _size) -{ - uint64_t pmd_pagesize =3D read_pmd_pagesize(); + kpageflags_fd =3D open(KPAGEFLAGS_PATH, O_RDONLY); + if (kpageflags_fd < 0) { + close(pagemap_fd); + ksft_exit_fail_msg("open kpageflags fail\n"); + } =20 - if (!pmd_pagesize) - ksft_exit_fail_msg("reading PMD pagesize failed\n"); + if (check_large && !check_large_folios(pagemap_fd, kpageflags_fd, + addr, len, nr_hpages, hpage_size)) + goto out; =20 - if (hpage_size =3D=3D pmd_pagesize) - return __check_pmd_huge(addr, "FilePmdMapped:", nr_hpages, hpage_size); + for (; start < end; start +=3D granule) { + categories =3D pagemap_scan_get_categories(pagemap_fd, start); + pfn =3D pagemap_get_pfn(pagemap_fd, start); + if (pfn =3D=3D -1UL) { + if (check_large) + goto out; + else + continue; + } + if (pageflags_get(pfn, kpageflags_fd, &kpf)) + ksft_exit_fail_msg("read kpageflags: %s\n", strerror(errno)); + huge_mapped =3D categories & PAGE_IS_HUGE; + if (check_large !=3D huge_mapped) { + if (!check_large || granule =3D=3D pmd_pagesize) + goto out; + } + if (kpf & KPF_COMPOUND_TAIL) + continue; + if (!!(categories & PAGE_IS_FILE) !=3D (type !=3D CHECK_HUGE_ANON)) + goto out; + if (type =3D=3D CHECK_HUGE_ANON) + continue; + if (!!(kpf & KPF_SWAPBACKED) !=3D (type !=3D CHECK_HUGE_FILE)) + goto out; + } =20 - return check_large_folios(addr, len, nr_hpages, hpage_size); +out: + close(pagemap_fd); + close(kpageflags_fd); + return start >=3D end; } =20 -bool check_huge_shmem(void *addr, size_t len, int nr_hpages, uint64_t hpag= e_size) +bool check_huge_anon(void *addr, size_t len, int nr_hpages, uint64_t hpage= _size) { - uint64_t pmd_pagesize =3D read_pmd_pagesize(); - - if (!pmd_pagesize) - ksft_exit_fail_msg("reading PMD pagesize failed\n"); + return __check_pmd_huge(addr, len, nr_hpages, hpage_size, CHECK_HUGE_ANON= ); +} =20 - if (hpage_size =3D=3D pmd_pagesize) - return __check_pmd_huge(addr, "ShmemPmdMapped:", nr_hpages, hpage_size); +bool check_huge_file(void *addr, size_t len, int nr_hpages, uint64_t hpage= _size) +{ + return __check_pmd_huge(addr, len, nr_hpages, hpage_size, CHECK_HUGE_FILE= ); +} =20 - return check_large_folios(addr, len, nr_hpages, hpage_size); +bool check_huge_shmem(void *addr, size_t len, int nr_hpages, uint64_t hpag= e_size) +{ + return __check_pmd_huge(addr, len, nr_hpages, hpage_size, CHECK_HUGE_SHME= M); } =20 int64_t allocate_transhuge(void *ptr, int pagemap_fd) diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests= /mm/vm_util.h index 9a49af88702e..f19bd17817e5 100644 --- a/tools/testing/selftests/mm/vm_util.h +++ b/tools/testing/selftests/mm/vm_util.h @@ -18,6 +18,7 @@ #define PM_SWAP BIT_ULL(62) #define PM_PRESENT BIT_ULL(63) =20 +#define KPF_SWAPBACKED BIT_ULL(14) #define KPF_COMPOUND_HEAD BIT_ULL(15) #define KPF_COMPOUND_TAIL BIT_ULL(16) #define KPF_HWPOISON BIT_ULL(19) --=20 2.43.0