From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e06smtp10.uk.ibm.com (e06smtp10.uk.ibm.com [195.75.94.106]) (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id DB0371A1974 for ; Wed, 8 Jul 2015 16:46:16 +1000 (AEST) Received: from /spool/local by e06smtp10.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 8 Jul 2015 07:46:11 +0100 Received: from b06cxnps3074.portsmouth.uk.ibm.com (d06relay09.portsmouth.uk.ibm.com [9.149.109.194]) by d06dlp03.portsmouth.uk.ibm.com (Postfix) with ESMTP id 2C1081B08072 for ; Wed, 8 Jul 2015 07:47:20 +0100 (BST) Received: from d06av01.portsmouth.uk.ibm.com (d06av01.portsmouth.uk.ibm.com [9.149.37.212]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id t686k9Bs29163650 for ; Wed, 8 Jul 2015 06:46:09 GMT Received: from d06av01.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av01.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id t686k7N7011517 for ; Wed, 8 Jul 2015 00:46:08 -0600 Date: Wed, 8 Jul 2015 08:46:07 +0200 From: Heiko Carstens To: Eric B Munson Cc: Andrew Morton , Michal Hocko , Vlastimil Babka , linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, adi-buildroot-devel@lists.sourceforge.net, linux-cris-kernel@axis.com, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@linux-mips.org, linux-am33-list@redhat.com, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH V3 2/5] mm: mlock: Add new mlock, munlock, and munlockall system calls Message-ID: <20150708064607.GB7079@osiris> References: <1436288623-13007-1-git-send-email-emunson@akamai.com> <1436288623-13007-3-git-send-email-emunson@akamai.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <1436288623-13007-3-git-send-email-emunson@akamai.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Tue, Jul 07, 2015 at 01:03:40PM -0400, Eric B Munson wrote: > With the refactored mlock code, introduce new system calls for mlock, > munlock, and munlockall. The new calls will allow the user to specify > what lock states are being added or cleared. mlock2 and munlock2 are > trivial at the moment, but a follow on patch will add a new mlock state > making them useful. > > munlock2 addresses a limitation of the current implementation. If a > user calls mlockall(MCL_CURRENT | MCL_FUTURE) and then later decides > that MCL_FUTURE should be removed, they would have to call munlockall() > followed by mlockall(MCL_CURRENT) which could potentially be very > expensive. The new munlockall2 system call allows a user to simply > clear the MCL_FUTURE flag. > > Signed-off-by: Eric B Munson ... > diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S > index 1acad02..f6d81d6 100644 > --- a/arch/s390/kernel/syscalls.S > +++ b/arch/s390/kernel/syscalls.S > @@ -363,3 +363,6 @@ SYSCALL(sys_bpf,compat_sys_bpf) > SYSCALL(sys_s390_pci_mmio_write,compat_sys_s390_pci_mmio_write) > SYSCALL(sys_s390_pci_mmio_read,compat_sys_s390_pci_mmio_read) > SYSCALL(sys_execveat,compat_sys_execveat) > +SYSCALL(sys_mlock2,compat_sys_mlock2) /* 355 */ > +SYSCALL(sys_munlock2,compat_sys_munlock2) > +SYSCALL(sys_munlockall2,compat_sys_munlockall2) FWIW, you would also need to add matching lines to the two files arch/s390/include/uapi/asm/unistd.h arch/s390/kernel/compat_wrapper.c so that the system call would be wired up on s390.