From patchwork Wed Aug 26 18:24:21 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric B Munson X-Patchwork-Id: 7079601 Return-Path: X-Original-To: patchwork-linux-sh@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 9BE699F372 for ; Wed, 26 Aug 2015 18:54:41 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id AAC1120947 for ; Wed, 26 Aug 2015 18:54:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1116820942 for ; Wed, 26 Aug 2015 18:54:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751759AbbHZSyc (ORCPT ); Wed, 26 Aug 2015 14:54:32 -0400 Received: from a23-79-238-179.deploy.static.akamaitechnologies.com ([23.79.238.179]:23550 "EHLO prod-mail-xrelay05.akamai.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1750836AbbHZSyb (ORCPT ); Wed, 26 Aug 2015 14:54:31 -0400 X-Greylist: delayed 1801 seconds by postgrey-1.27 at vger.kernel.org; Wed, 26 Aug 2015 14:54:30 EDT Received: from prod-mail-xrelay05.akamai.com (localhost.localdomain [127.0.0.1]) by postfix.imss70 (Postfix) with ESMTP id 22B7147CDE; Wed, 26 Aug 2015 18:24:28 +0000 (GMT) Received: from prod-mail-relay11.akamai.com (prod-mail-relay11.akamai.com [172.27.118.250]) by prod-mail-xrelay05.akamai.com (Postfix) with ESMTP id 0859047CBC; Wed, 26 Aug 2015 18:24:28 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=akamai.com; s=a1; t=1440613468; bh=owreH8DCaTxmlvtNmOZHySLPiEMtDOfWY41S02LuLpA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dsteukobF6yBhI56yMP9QIuzOp9ITworbgr6+pInTh0Wv6ZYQSQiOoe6hh2nEKfyh xiKHlYr23UzQxg7Nv9+1LUUurNG0rKJK3+B9KMZENJONxu4EHItFPfefiB+H7U+F5U D9qGRf5/bkRG4yuElawVq+9FXDrd9XhpiuRJxy44= Received: from bos-lp6ds.kendall.corp.akamai.com (bos-lp6ds.kendall.corp.akamai.com [172.28.12.119]) by prod-mail-relay11.akamai.com (Postfix) with ESMTP id E77F0203F; Wed, 26 Aug 2015 18:24:27 +0000 (GMT) From: Eric B Munson To: Andrew Morton Cc: Eric B Munson , Michal Hocko , Vlastimil Babka , Heiko Carstens , Geert Uytterhoeven , Catalin Marinas , Stephen Rothwell , Guenter Roeck , 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-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: [PATCH v8 2/6] mm: mlock: Add new mlock system call Date: Wed, 26 Aug 2015 14:24:21 -0400 Message-Id: <1440613465-30393-3-git-send-email-emunson@akamai.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1440613465-30393-1-git-send-email-emunson@akamai.com> References: <1440613465-30393-1-git-send-email-emunson@akamai.com> Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Spam-Status: No, score=-3.2 required=5.0 tests=BAYES_00,DKIM_SIGNED, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP With the refactored mlock code, introduce a new system call for mlock. The new call will allow the user to specify what lock states are being added. mlock2 is trivial at the moment, but a follow on patch will add a new mlock state making it useful. Signed-off-by: Eric B Munson Acked-by: Vlastimil Babka Acked-by: Michal Hocko Cc: Michal Hocko Cc: Vlastimil Babka Cc: Heiko Carstens Cc: Geert Uytterhoeven Cc: Catalin Marinas Cc: Stephen Rothwell Cc: Guenter Roeck Cc: linux-alpha@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: adi-buildroot-devel@lists.sourceforge.net Cc: linux-cris-kernel@axis.com Cc: linux-ia64@vger.kernel.org Cc: linux-m68k@lists.linux-m68k.org Cc: linux-am33-list@redhat.com Cc: linux-parisc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: linux-sh@vger.kernel.org Cc: sparclinux@vger.kernel.org Cc: linux-xtensa@linux-xtensa.org Cc: linux-api@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-mm@kvack.org --- arch/x86/entry/syscalls/syscall_32.tbl | 1 + arch/x86/entry/syscalls/syscall_64.tbl | 1 + include/linux/syscalls.h | 2 ++ include/uapi/asm-generic/unistd.h | 4 +++- kernel/sys_ni.c | 1 + mm/mlock.c | 8 ++++++++ 6 files changed, 16 insertions(+), 1 deletion(-) diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl index ef8187f..8e06da6 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -365,3 +365,4 @@ 356 i386 memfd_create sys_memfd_create 357 i386 bpf sys_bpf 358 i386 execveat sys_execveat stub32_execveat +360 i386 mlock2 sys_mlock2 diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl index 9ef32d5..67601e7 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -329,6 +329,7 @@ 320 common kexec_file_load sys_kexec_file_load 321 common bpf sys_bpf 322 64 execveat stub_execveat +324 common mlock2 sys_mlock2 # # x32-specific system call numbers start at 512 to avoid cache impact diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index b45c45b..56a3d59 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -884,4 +884,6 @@ asmlinkage long sys_execveat(int dfd, const char __user *filename, const char __user *const __user *argv, const char __user *const __user *envp, int flags); +asmlinkage long sys_mlock2(unsigned long start, size_t len, int flags); + #endif diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index e016bd9..14a6013 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -709,9 +709,11 @@ __SYSCALL(__NR_memfd_create, sys_memfd_create) __SYSCALL(__NR_bpf, sys_bpf) #define __NR_execveat 281 __SC_COMP(__NR_execveat, sys_execveat, compat_sys_execveat) +#define __NR_mlock2 282 +__SYSCALL(__NR_mlock2, sys_mlock2) #undef __NR_syscalls -#define __NR_syscalls 282 +#define __NR_syscalls 283 /* * All syscalls below here should go away really, diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c index 7995ef5..4818b71 100644 --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c @@ -193,6 +193,7 @@ cond_syscall(sys_mlock); cond_syscall(sys_munlock); cond_syscall(sys_mlockall); cond_syscall(sys_munlockall); +cond_syscall(sys_mlock2); cond_syscall(sys_mincore); cond_syscall(sys_madvise); cond_syscall(sys_mremap); diff --git a/mm/mlock.c b/mm/mlock.c index 5692ee5..3094f27 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -643,6 +643,14 @@ SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len) return do_mlock(start, len, VM_LOCKED); } +SYSCALL_DEFINE3(mlock2, unsigned long, start, size_t, len, int, flags) +{ + if (flags) + return -EINVAL; + + return do_mlock(start, len, VM_LOCKED); +} + SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len) { int ret;