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Mon, 21 Feb 2022 07:09:25 +0000 (GMT) Received: from tuxmaker.linux.ibm.com (unknown [9.152.85.9]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Mon, 21 Feb 2022 07:09:25 +0000 (GMT) From: Sven Schnelle To: Anshuman Khandual Cc: linux-mm@kvack.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, Christoph Hellwig , linux-arch@vger.kernel.org, Heiko Carstens , Vasily Gorbik , linux-s390@vger.kernel.org Subject: Re: [PATCH V2 14/30] s390/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT References: <1645425519-9034-1-git-send-email-anshuman.khandual@arm.com> <1645425519-9034-15-git-send-email-anshuman.khandual@arm.com> Date: Mon, 21 Feb 2022 08:09:24 +0100 In-Reply-To: <1645425519-9034-15-git-send-email-anshuman.khandual@arm.com> (Anshuman Khandual's message of "Mon, 21 Feb 2022 12:08:23 +0530") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 44z3tJRQA9fHVPR-mZnYWCBOdkf3-xMR X-Proofpoint-GUID: 44z3tJRQA9fHVPR-mZnYWCBOdkf3-xMR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-02-21_02,2022-02-18_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 mlxlogscore=724 impostorscore=0 clxscore=1011 adultscore=0 spamscore=0 bulkscore=0 phishscore=0 priorityscore=1501 suspectscore=0 lowpriorityscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202210045 X-Stat-Signature: mizb9eux7dm4p84zd8jir6f3yczq786u X-Rspam-User: Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=ibm.com header.s=pp1 header.b=kY+b+y1i; spf=pass (imf23.hostedemail.com: domain of svens@linux.ibm.com designates 148.163.158.5 as permitted sender) smtp.mailfrom=svens@linux.ibm.com; dmarc=pass (policy=none) header.from=ibm.com X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: E56AC140002 X-HE-Tag: 1645427380-825183 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000008, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Anshuman Khandual writes: > This defines and exports a platform specific custom vm_get_page_prot() via > subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX > macros can be dropped which are no longer needed. > > Cc: Heiko Carstens > Cc: Vasily Gorbik > Cc: linux-s390@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual Acked-by: Sven Schnelle > --- > arch/s390/Kconfig | 1 + > arch/s390/include/asm/pgtable.h | 17 ----------------- > arch/s390/mm/mmap.c | 33 +++++++++++++++++++++++++++++++++ > 3 files changed, 34 insertions(+), 17 deletions(-) > > diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig > index be9f39fd06df..cb1b487e8201 100644 > --- a/arch/s390/Kconfig > +++ b/arch/s390/Kconfig > @@ -78,6 +78,7 @@ config S390 > select ARCH_HAS_SYSCALL_WRAPPER > select ARCH_HAS_UBSAN_SANITIZE_ALL > select ARCH_HAS_VDSO_DATA > + select ARCH_HAS_VM_GET_PAGE_PROT > select ARCH_HAVE_NMI_SAFE_CMPXCHG > select ARCH_INLINE_READ_LOCK > select ARCH_INLINE_READ_LOCK_BH > diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h > index 008a6c856fa4..3893ef64b439 100644 > --- a/arch/s390/include/asm/pgtable.h > +++ b/arch/s390/include/asm/pgtable.h > @@ -422,23 +422,6 @@ static inline int is_module_addr(void *addr) > * implies read permission. > */ > /*xwr*/ > -#define __P000 PAGE_NONE > -#define __P001 PAGE_RO > -#define __P010 PAGE_RO > -#define __P011 PAGE_RO > -#define __P100 PAGE_RX > -#define __P101 PAGE_RX > -#define __P110 PAGE_RX > -#define __P111 PAGE_RX > - > -#define __S000 PAGE_NONE > -#define __S001 PAGE_RO > -#define __S010 PAGE_RW > -#define __S011 PAGE_RW > -#define __S100 PAGE_RX > -#define __S101 PAGE_RX > -#define __S110 PAGE_RWX > -#define __S111 PAGE_RWX > > /* > * Segment entry (large page) protection definitions. > diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c > index e54f928503c5..e99c198aa5de 100644 > --- a/arch/s390/mm/mmap.c > +++ b/arch/s390/mm/mmap.c > @@ -188,3 +188,36 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) > mm->get_unmapped_area = arch_get_unmapped_area_topdown; > } > } > + > +pgprot_t vm_get_page_prot(unsigned long vm_flags) > +{ > + switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) { > + case VM_NONE: > + return PAGE_NONE; > + case VM_READ: > + case VM_WRITE: > + case VM_WRITE | VM_READ: > + return PAGE_RO; > + case VM_EXEC: > + case VM_EXEC | VM_READ: > + case VM_EXEC | VM_WRITE: > + case VM_EXEC | VM_WRITE | VM_READ: > + return PAGE_RX; > + case VM_SHARED: > + return PAGE_NONE; > + case VM_SHARED | VM_READ: > + return PAGE_RO; > + case VM_SHARED | VM_WRITE: > + case VM_SHARED | VM_WRITE | VM_READ: > + return PAGE_RW; > + case VM_SHARED | VM_EXEC: > + case VM_SHARED | VM_EXEC | VM_READ: > + return PAGE_RX; > + case VM_SHARED | VM_EXEC | VM_WRITE: > + case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ: > + return PAGE_RWX; > + default: > + BUILD_BUG(); > + } > +} > +EXPORT_SYMBOL(vm_get_page_prot);