From nobody Mon Apr 6 10:31:53 2026 Received: from out30-131.freemail.mail.aliyun.com (out30-131.freemail.mail.aliyun.com [115.124.30.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7F094314D1D; Sat, 21 Mar 2026 06:43:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774075402; cv=none; b=Nzy02aGG6Ewr4cbfHPy6dKiGADjxcN0E22qqZZM8AcZ4pC8lE3XpXMQhHzgfXxh9CzsuNpq71PZM/S6a5qcIQRzo28VpjJ1KHlfhYNDdynej5CNKCqKEkf5nZvgxUmicKGeiCFtjf2CRkGmXt+m56TPr5HGmLGcpH+mSvF8Sc0I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774075402; c=relaxed/simple; bh=B8QoGA14xe7zSplP5cKmQlZ9guWF0Wti4FPRt6Q4UMk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=e9ExB4GGjR34YG7jhCGn1SJ/7eOLwErQrEfSu2B94yHWCPN6WiUrSKE0pHoiaqe+5Uu1LTRT67UwaNbZGSwmu8gp+lLxkbBklhmZgNsjgGVhtrddip2iXIvm9QAyxTUCblcK3wwZzjbMOibRg26Z7gVRFTXWE2IjLF6xq9UizFg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=I92paPWm; arc=none smtp.client-ip=115.124.30.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="I92paPWm" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1774075391; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=DKPUJMB2CvMsCVl9Ou1D+eNQe4gk5dNFjUcWcWZbm30=; b=I92paPWmxugBP1jyYwgk1vGgAbijED+CMrOWSw7UKnclmb5dAZFpKKGWkkgJnYC1cODxdnPk04lwLZbNFVcVV2MJ8ZOHQ1gOlinCdLwNwBicxLYJNGCoIGmOIe/Fjg4EvkkQVBBRhmO+9wXtBl7a9ChvqeMO0uicGSbfe/ty8to= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R311e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037033178;MF=baolin.wang@linux.alibaba.com;NM=1;PH=DS;RN=18;SR=0;TI=SMTPD_---0X.O5VF6_1774075390; Received: from localhost(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0X.O5VF6_1774075390 cluster:ay36) by smtp.aliyun-inc.com; Sat, 21 Mar 2026 14:43:10 +0800 From: Baolin Wang To: akpm@linux-foundation.org, david@kernel.org Cc: ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, baolin.wang@linux.alibaba.com, linux-arm-kernel@lists.infradead.org, x86@kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org (open), linux-kernel@vger.kernel.org Subject: [PATCH v2 3/6] mm: change to return bool for pmdp_test_and_clear_young() Date: Sat, 21 Mar 2026 14:42:51 +0800 Message-ID: X-Mailer: git-send-email 2.47.3 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Callers use pmdp_test_and_clear_young() to clear the young flag and check whether it was set for this PMD entry. Change the return type to bool to make the intention clearer. Reviewed-by: Ritesh Harjani (IBM) Reviewed-by: Lorenzo Stoakes (Oracle) Signed-off-by: Baolin Wang --- arch/arm64/include/asm/pgtable.h | 5 ++--- arch/powerpc/include/asm/book3s/64/pgtable.h | 10 +++++----- arch/powerpc/mm/book3s64/pgtable.c | 4 ++-- arch/riscv/include/asm/pgtable.h | 4 ++-- arch/s390/include/asm/pgtable.h | 4 ++-- arch/x86/include/asm/pgtable.h | 4 ++-- arch/x86/mm/pgtable.c | 6 +++--- include/linux/pgtable.h | 19 +++++++++---------- 8 files changed, 27 insertions(+), 29 deletions(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgta= ble.h index 1009f719b157..52bafe79c10a 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -1320,9 +1320,8 @@ static inline bool __ptep_clear_flush_young(struct vm= _area_struct *vma, =20 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_ARCH_HAS_NONLEA= F_PMD_YOUNG) #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG -static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, - unsigned long address, - pmd_t *pmdp) +static inline bool pmdp_test_and_clear_young(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp) { /* Operation applies to PMD table entry only if FEAT_HAFT is enabled */ VM_WARN_ON(pmd_table(READ_ONCE(*pmdp)) && !system_supports_haft()); diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/in= clude/asm/book3s/64/pgtable.h index c049a2e26e25..8b354e81ab22 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -1161,13 +1161,13 @@ pud_hugepage_update(struct mm_struct *mm, unsigned = long addr, pud_t *pudp, * For radix we should always find H_PAGE_HASHPTE zero. Hence * the below will work for radix too */ -static inline int __pmdp_test_and_clear_young(struct mm_struct *mm, - unsigned long addr, pmd_t *pmdp) +static inline bool __pmdp_test_and_clear_young(struct mm_struct *mm, + unsigned long addr, pmd_t *pmdp) { unsigned long old; =20 if ((pmd_raw(*pmdp) & cpu_to_be64(_PAGE_ACCESSED | H_PAGE_HASHPTE)) =3D= =3D 0) - return 0; + return false; old =3D pmd_hugepage_update(mm, addr, pmdp, _PAGE_ACCESSED, 0); return ((old & _PAGE_ACCESSED) !=3D 0); } @@ -1300,8 +1300,8 @@ extern int pudp_set_access_flags(struct vm_area_struc= t *vma, pud_t entry, int dirty); =20 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG -extern int pmdp_test_and_clear_young(struct vm_area_struct *vma, - unsigned long address, pmd_t *pmdp); +bool pmdp_test_and_clear_young(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp); #define __HAVE_ARCH_PUDP_TEST_AND_CLEAR_YOUNG extern int pudp_test_and_clear_young(struct vm_area_struct *vma, unsigned long address, pud_t *pudp); diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/= pgtable.c index 4b09c04654a8..c584321e3d41 100644 --- a/arch/powerpc/mm/book3s64/pgtable.c +++ b/arch/powerpc/mm/book3s64/pgtable.c @@ -98,8 +98,8 @@ int pudp_set_access_flags(struct vm_area_struct *vma, uns= igned long address, } =20 =20 -int pmdp_test_and_clear_young(struct vm_area_struct *vma, - unsigned long address, pmd_t *pmdp) +bool pmdp_test_and_clear_young(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp) { return __pmdp_test_and_clear_young(vma->vm_mm, address, pmdp); } diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgta= ble.h index b9dacfc280b1..67e7746e3fbe 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -1015,8 +1015,8 @@ static inline int pmdp_set_access_flags(struct vm_are= a_struct *vma, } =20 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG -static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, - unsigned long address, pmd_t *pmdp) +static inline bool pmdp_test_and_clear_young(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp) { return ptep_test_and_clear_young(vma, address, (pte_t *)pmdp); } diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtabl= e.h index ac74b5076d8f..87a5082da28e 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -1683,8 +1683,8 @@ static inline int pmdp_set_access_flags(struct vm_are= a_struct *vma, } =20 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG -static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, - unsigned long addr, pmd_t *pmdp) +static inline bool pmdp_test_and_clear_young(struct vm_area_struct *vma, + unsigned long addr, pmd_t *pmdp) { pmd_t pmd =3D *pmdp; =20 diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 3993657e0a35..ba867bac6096 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -1295,8 +1295,8 @@ extern int pudp_set_access_flags(struct vm_area_struc= t *vma, pud_t entry, int dirty); =20 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG -extern int pmdp_test_and_clear_young(struct vm_area_struct *vma, - unsigned long addr, pmd_t *pmdp); +bool pmdp_test_and_clear_young(struct vm_area_struct *vma, + unsigned long addr, pmd_t *pmdp); extern int pudp_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pud_t *pudp); =20 diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index 1348384a3bb9..b09e8c5dadf9 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -456,10 +456,10 @@ bool ptep_test_and_clear_young(struct vm_area_struct = *vma, } =20 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_ARCH_HAS_NONLEA= F_PMD_YOUNG) -int pmdp_test_and_clear_young(struct vm_area_struct *vma, - unsigned long addr, pmd_t *pmdp) +bool pmdp_test_and_clear_young(struct vm_area_struct *vma, + unsigned long addr, pmd_t *pmdp) { - int ret =3D 0; + bool ret =3D false; =20 if (pmd_young(*pmdp)) ret =3D test_and_clear_bit(_PAGE_BIT_ACCESSED, diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 99450a3b0705..6db900a5d38b 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -507,25 +507,24 @@ static inline bool ptep_test_and_clear_young(struct v= m_area_struct *vma, =20 #ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_ARCH_HAS_NONLEA= F_PMD_YOUNG) -static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, - unsigned long address, - pmd_t *pmdp) +static inline bool pmdp_test_and_clear_young(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp) { pmd_t pmd =3D *pmdp; - int r =3D 1; + bool young =3D true; + if (!pmd_young(pmd)) - r =3D 0; + young =3D false; else set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd)); - return r; + return young; } #else -static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, - unsigned long address, - pmd_t *pmdp) +static inline bool pmdp_test_and_clear_young(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp) { BUILD_BUG(); - return 0; + return false; } #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG= */ #endif --=20 2.47.3