From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f197.google.com (mail-ob0-f197.google.com [209.85.214.197]) by kanga.kvack.org (Postfix) with ESMTP id 339836B0262 for ; Wed, 29 Jun 2016 06:59:03 -0400 (EDT) Received: by mail-ob0-f197.google.com with SMTP id at7so95964463obd.1 for ; Wed, 29 Jun 2016 03:59:03 -0700 (PDT) Received: from EUR01-HE1-obe.outbound.protection.outlook.com (mail-he1eur01on0132.outbound.protection.outlook.com. [104.47.0.132]) by mx.google.com with ESMTPS id l39si2526277ote.168.2016.06.29.03.59.02 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 29 Jun 2016 03:59:02 -0700 (PDT) From: Dmitry Safonov Subject: [PATCHv2 3/6] x86/arch_prctl/vdso: add ARCH_MAP_VDSO_* Date: Wed, 29 Jun 2016 13:57:33 +0300 Message-ID: <20160629105736.15017-4-dsafonov@virtuozzo.com> In-Reply-To: <20160629105736.15017-1-dsafonov@virtuozzo.com> References: <20160629105736.15017-1-dsafonov@virtuozzo.com> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel@vger.kernel.org Cc: 0x7f454c46@gmail.com, linux-mm@kvack.org, mingo@redhat.com, luto@amacapital.net, gorcunov@openvz.org, xemul@virtuozzo.com, oleg@redhat.com, Dmitry Safonov , Andy Lutomirski , Thomas Gleixner , "H. Peter Anvin" , x86@kernel.org Add API to change vdso blob type with arch_prctl. As this is usefull only by needs of CRIU, expose this interface under CONFIG_CHECKPOINT_RESTORE. Cc: Andy Lutomirski Cc: Ingo Molnar Cc: Thomas Gleixner Cc: "H. Peter Anvin" Cc: Cyrill Gorcunov Cc: Pavel Emelyanov Cc: x86@kernel.org Signed-off-by: Dmitry Safonov --- arch/x86/include/uapi/asm/prctl.h | 6 ++++++ arch/x86/kernel/process_64.c | 10 ++++++++++ 2 files changed, 16 insertions(+) diff --git a/arch/x86/include/uapi/asm/prctl.h b/arch/x86/include/uapi/asm/prctl.h index 3ac5032fae09..ae135de547f5 100644 --- a/arch/x86/include/uapi/asm/prctl.h +++ b/arch/x86/include/uapi/asm/prctl.h @@ -6,4 +6,10 @@ #define ARCH_GET_FS 0x1003 #define ARCH_GET_GS 0x1004 +#ifdef CONFIG_CHECKPOINT_RESTORE +# define ARCH_MAP_VDSO_X32 0x2001 +# define ARCH_MAP_VDSO_32 0x2002 +# define ARCH_MAP_VDSO_64 0x2003 +#endif + #endif /* _ASM_X86_PRCTL_H */ diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 6e789ca1f841..64459c88b3d9 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -49,6 +49,7 @@ #include #include #include +#include asmlinkage extern void ret_from_fork(void); @@ -577,6 +578,15 @@ long do_arch_prctl(struct task_struct *task, int code, unsigned long addr) break; } +#ifdef CONFIG_CHECKPOINT_RESTORE + case ARCH_MAP_VDSO_X32: + return do_map_vdso(VDSO_X32, addr, false); + case ARCH_MAP_VDSO_32: + return do_map_vdso(VDSO_32, addr, false); + case ARCH_MAP_VDSO_64: + return do_map_vdso(VDSO_64, addr, false); +#endif + default: ret = -EINVAL; break; -- 2.9.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org