From nobody Wed Feb 11 07:07:37 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 57146605AD for ; Wed, 6 Mar 2024 10:42:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709721779; cv=none; b=J5KAvOUTo6sgAMx5ZDUA+ZyCsACtprlSeJ2djAvz3dwH9gYJrXuiJr8rRqTEJcF0IsePmtrG9JILlNu0surlYwdVe8mxx1Y2ZuX/YTt1ODIIHtS5rXCPl8GQac+bAAznxcIQHZh8OGS7e68tE9zbqfIEUlaY2Ba9mvAHRFuahBY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709721779; c=relaxed/simple; bh=5RHxSgtdvJKVCp5Pr7PrdSJPxWg3TC/UA6xoLVOm0PY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=f4l7dXSb9RLtX/mR+plC3bixCwXBJhMVnaA9o7fmU+jJJtwpTRy1aOzoQ0+ITbgfh0XLG0J+c/kObh7ftn7V5WMwfRqRTzK2tLq2jhKmGx/52ZPVvNGlXVW6KdMNIiGbU9R4Lm7B8sLLxenez4yhtpb3EqMUe9CVuFt0gF9jDDw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none 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=eVWZ5zwK; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none 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="eVWZ5zwK" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1709721777; 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=4C+lWpN1qDfU+nymiqOVXkY7IqPiijqTb8F5rFjpmTU=; b=eVWZ5zwKEn8D25OPaGhlp+G77eC1s/VFSQZFX7ZvRMeh6LSTS7vORfQP5vYpnprelmrGn3 KuJgJbsHcZH70ERCBmFUM804XqyGrD2HnaJJymlEBNvkXJBUR+R4uXsI/nPNmfie/tWYzv 8M0w72q+B0hvNuAmvVSMi4M5yivXI3k= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-622-aSR7lTs0MGOXGlrFM8hoQg-1; Wed, 06 Mar 2024 05:42:54 -0500 X-MC-Unique: aSR7lTs0MGOXGlrFM8hoQg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (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 mimecast-mx02.redhat.com (Postfix) with ESMTPS id 7927980F7E3; Wed, 6 Mar 2024 10:42:53 +0000 (UTC) Received: from x1n.redhat.com (unknown [10.72.116.8]) by smtp.corp.redhat.com (Postfix) with ESMTP id A34D7111DCFF; Wed, 6 Mar 2024 10:42:44 +0000 (UTC) From: peterx@redhat.com To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org, Andrew Morton , Muchun Song , Jason Gunthorpe , peterx@redhat.com, Matthew Wilcox , Mike Rapoport , Christophe Leroy , x86@kernel.org, sparclinux@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Russell King , Shawn Guo , Krzysztof Kozlowski , Bjorn Andersson , Arnd Bergmann , Konrad Dybcio , Fabio Estevam Subject: [PATCH RFC 07/13] mm/arm: Redefine pmd_huge() with pmd_leaf() Date: Wed, 6 Mar 2024 18:41:41 +0800 Message-ID: <20240306104147.193052-8-peterx@redhat.com> In-Reply-To: <20240306104147.193052-1-peterx@redhat.com> References: <20240306104147.193052-1-peterx@redhat.com> 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 10.11.54.3 Content-Type: text/plain; charset="utf-8" From: Peter Xu Most of the archs already define these two APIs the same way. ARM is more complicated in two aspects: - For pXd_huge() it's always checking against !PXD_TABLE_BIT, while for pXd_leaf() it's always checking against PXD_TYPE_SECT. - SECT/TABLE bits are defined differently on 2-level v.s. 3-level ARM pgtables, which makes the whole thing even harder to follow. Luckily, the second complexity should be hidden by the pmd_leaf() implementation against 2-level v.s. 3-level headers. Invoke pmd_leaf() directly for pmd_huge(), to remove the first part of complexity. This prepares to drop pXd_huge() API globally. When at it, drop the obsolete comments - it's outdated. Cc: Russell King Cc: Shawn Guo Cc: Krzysztof Kozlowski Cc: Bjorn Andersson Cc: Arnd Bergmann Cc: Konrad Dybcio Cc: Fabio Estevam Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Peter Xu --- arch/arm/mm/hugetlbpage.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/arch/arm/mm/hugetlbpage.c b/arch/arm/mm/hugetlbpage.c index dd7a0277c5c0..c2fa643f6bb5 100644 --- a/arch/arm/mm/hugetlbpage.c +++ b/arch/arm/mm/hugetlbpage.c @@ -18,11 +18,6 @@ #include #include =20 -/* - * On ARM, huge pages are backed by pmd's rather than pte's, so we do a lot - * of type casting from pmd_t * to pte_t *. - */ - int pud_huge(pud_t pud) { return 0; @@ -30,5 +25,5 @@ int pud_huge(pud_t pud) =20 int pmd_huge(pmd_t pmd) { - return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT); + return pmd_leaf(pmd); } --=20 2.44.0