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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 15 Oct 2018 17:42:53 +0100 Received: from d06av24.portsmouth.uk.ibm.com (mk.ibm.com [9.149.105.60]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w9FGgqSg4784628 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 15 Oct 2018 16:42:52 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6C31442045; Mon, 15 Oct 2018 19:42:26 +0100 (BST) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1E5A94203F; Mon, 15 Oct 2018 19:42:26 +0100 (BST) Received: from mschwideX1.emea.ibm.com (unknown [9.145.33.55]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Mon, 15 Oct 2018 19:42:26 +0100 (BST) From: Martin Schwidefsky To: Li Wang , Guenter Roeck , Janosch Frank Cc: "Kirill A. Shutemov" , Heiko Carstens , linux-kernel , Linux-MM , Martin Schwidefsky Subject: [PATCH 1/3] mm: introduce mm_[p4d|pud|pmd]_folded Date: Mon, 15 Oct 2018 18:42:37 +0200 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1539621759-5967-1-git-send-email-schwidefsky@de.ibm.com> References: <1539621759-5967-1-git-send-email-schwidefsky@de.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18101516-0012-0000-0000-000002B75875 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18101516-0013-0000-0000-000020EBC9DC Message-Id: <1539621759-5967-2-git-send-email-schwidefsky@de.ibm.com> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-10-15_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=703 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1810150147 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add three architecture overrideable function to test if the p4d, pud, or pmd layer of a page table is folded or not. Signed-off-by: Martin Schwidefsky --- include/linux/mm.h | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 0416a7204be3..d1029972541c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -105,6 +105,46 @@ extern int mmap_rnd_compat_bits __read_mostly; #define mm_zero_struct_page(pp) ((void)memset((pp), 0, sizeof(struct page))) #endif +/* + * On some architectures it depends on the mm if the p4d/pud or pmd + * layer of the page table hierarchy is folded or not. + */ +#ifndef mm_p4d_folded +#define mm_p4d_folded(mm) mm_p4d_folded(mm) +static inline bool mm_p4d_folded(struct mm_struct *mm) +{ +#ifdef __PAGETABLE_P4D_FOLDED + return 1; +#else + return 0; +#endif +} +#endif + +#ifndef mm_pud_folded +#define mm_pud_folded(mm) mm_pud_folded(mm) +static inline bool mm_pud_folded(struct mm_struct *mm) +{ +#ifdef __PAGETABLE_PUD_FOLDED + return 1; +#else + return 0; +#endif +} +#endif + +#ifndef mm_pmd_folded +#define mm_pmd_folded(mm) mm_pmd_folded(mm) +static inline bool mm_pmd_folded(struct mm_struct *mm) +{ +#ifdef __PAGETABLE_PMD_FOLDED + return 1; +#else + return 0; +#endif +} +#endif + /* * Default maximum number of active map areas, this limits the number of vmas * per mm struct. Users can overwrite this number by sysctl but there is a -- 2.16.4