From nobody Wed Feb 11 05:13:56 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 29B87311946 for ; Mon, 9 Feb 2026 22:15:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770675304; cv=none; b=rn/EGYv/XLb6/Pm/aYxVn5exZQJP0z6xYyccRSlApR2e6RWCxM2VfXVFHQ0L3IoufweW0Ewwm4tCNtL8RD7HEToFib9Ehej9KUFp9LnvtLTm17OkWQczjSYrfCMK+zSp6JnUTxjFqN78+Zf/v65AnxnomaPhGb+AcqYkqbRhfvs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770675304; c=relaxed/simple; bh=xPa/fA4XpsR78dMIU3NBRTTvwCrvEcRVBBHohgczIqs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=p5yzLRmAF1CUXfhg7RLOLWVbLhVI1TUbgJOGLDBwfQTNCqiLp7vdps0e7qsEl2razkCL/uHh9sfeNonwGvLgDEZsbr3Vfghb4L+8JGte9+NHof89JKWmrskIeUEBHYM92kIT9AqSrzloftdFx6Tz/e46gnAvWiS2/XCzBybJNcA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=dNsP5AOE; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="dNsP5AOE" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1770675302; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=67cjgvmN4wcDxnHIeyr7N4NSsVtUrHJXnKrlVxHMIvo=; b=dNsP5AOEknqc4IUb2w/x2UzHBvPEup1c+DPSdhMDnAMg/OFjWczZFZGzhf0UEmCTdDhaNF 5nUksjJ1Nw1oAeYa7Ac/iZGoZ6FEPpqbDV+T7mcHI83PPMq83JHUx4K1j+iU7tau7MnuLC fEFvxNTt9GDFvQJJPfn/FF/h5PG1TtU= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-121-TLr_Jra7Oci7mr7xmIMOiQ-1; Mon, 09 Feb 2026 17:15:00 -0500 X-MC-Unique: TLr_Jra7Oci7mr7xmIMOiQ-1 X-Mimecast-MFC-AGG-ID: TLr_Jra7Oci7mr7xmIMOiQ_1770675299 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0A6361955E77; Mon, 9 Feb 2026 22:14:59 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.22.65.66]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id B5F72180066C; Mon, 9 Feb 2026 22:14:57 +0000 (UTC) From: Luiz Capitulino To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, david@kernel.org, baolin.wang@linux.alibaba.com Cc: ryan.roberts@arm.com, akpm@linux-foundation.org, lorenzo.stoakes@oracle.com Subject: [PATCH v2 09/11] mm: replace thp_disabled_by_hw() with pgtable_has_pmd_leaves() Date: Mon, 9 Feb 2026 17:14:31 -0500 Message-ID: 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 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Content-Type: text/plain; charset="utf-8" Despite its name, thp_disabled_by_hw() just checks whether the architecture supports PMD-sized pages. It returns true when TRANSPARENT_HUGEPAGE_UNSUPPORTED is set in transparent_hugepage_flags, this only occurs if the architecture implements arch_has_pmd_leaves() and that function returns false. Since pgtable_has_pmd_leaves() provides the same semantics, use it instead. Signed-off-by: Luiz Capitulino --- include/linux/huge_mm.h | 7 ------- mm/huge_memory.c | 6 ++---- mm/memory.c | 2 +- mm/shmem.c | 2 +- 4 files changed, 4 insertions(+), 13 deletions(-) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index a4d9f964dfde..e291a650b10f 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -47,7 +47,6 @@ vm_fault_t vmf_insert_folio_pud(struct vm_fault *vmf, str= uct folio *folio, bool write); =20 enum transparent_hugepage_flag { - TRANSPARENT_HUGEPAGE_UNSUPPORTED, TRANSPARENT_HUGEPAGE_FLAG, TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, @@ -352,12 +351,6 @@ static inline bool vma_thp_disabled(struct vm_area_str= uct *vma, return mm_flags_test(MMF_DISABLE_THP_EXCEPT_ADVISED, vma->vm_mm); } =20 -static inline bool thp_disabled_by_hw(void) -{ - /* If the hardware/firmware marked hugepage support disabled. */ - return transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_UNSUPPORTE= D); -} - unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags); unsigned long thp_get_unmapped_area_vmflags(struct file *filp, unsigned lo= ng addr, diff --git a/mm/huge_memory.c b/mm/huge_memory.c index b80a897b9b6f..1e5ea2e47f79 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -122,7 +122,7 @@ unsigned long __thp_vma_allowable_orders(struct vm_area= _struct *vma, if (!vma->vm_mm) /* vdso */ return 0; =20 - if (thp_disabled_by_hw() || vma_thp_disabled(vma, vm_flags, forced_collap= se)) + if (!pgtable_has_pmd_leaves() || vma_thp_disabled(vma, vm_flags, forced_c= ollapse)) return 0; =20 /* khugepaged doesn't collapse DAX vma, but page fault is fine. */ @@ -905,10 +905,8 @@ static int __init hugepage_init(void) int err; struct kobject *hugepage_kobj; =20 - if (!arch_has_pmd_leaves()) { - transparent_hugepage_flags =3D 1 << TRANSPARENT_HUGEPAGE_UNSUPPORTED; + if (!pgtable_has_pmd_leaves()) return -EINVAL; - } =20 /* * hugepages can't be allocated by the buddy allocator diff --git a/mm/memory.c b/mm/memory.c index 9794429df015..1e9dbec7e6eb 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -5386,7 +5386,7 @@ vm_fault_t do_set_pmd(struct vm_fault *vmf, struct fo= lio *folio, struct page *pa * PMD mappings if THPs are disabled. As we already have a THP, * behave as if we are forcing a collapse. */ - if (thp_disabled_by_hw() || vma_thp_disabled(vma, vma->vm_flags, + if (!pgtable_has_pmd_leaves() || vma_thp_disabled(vma, vma->vm_flags, /* forced_collapse=3D*/ true)) return ret; =20 diff --git a/mm/shmem.c b/mm/shmem.c index 32529586cd78..1c98e84667a4 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1827,7 +1827,7 @@ unsigned long shmem_allowable_huge_orders(struct inod= e *inode, vm_flags_t vm_flags =3D vma ? vma->vm_flags : 0; unsigned int global_orders; =20 - if (thp_disabled_by_hw() || (vma && vma_thp_disabled(vma, vm_flags, shmem= _huge_force))) + if (!pgtable_has_pmd_leaves() || (vma && vma_thp_disabled(vma, vm_flags, = shmem_huge_force))) return 0; =20 global_orders =3D shmem_huge_global_enabled(inode, index, write_end, --=20 2.53.0