From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-4192269-1516208193-2-859068903798895325 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES enda, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='com', MailFrom='org' X-Spam-charsets: X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: linux-api-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1516208193; b=E/KO2Mt2tqeJB4nzlSK8lRu4PmY8OfBE1FO7gS/BDoRxylS s31A9AAUxdZEwgjxVei+q9afXxiryxuQvFQ9kwQoGuCeIUvxmy6J1Cyf8f39dcgd qSQnKStpDGFUVVbVt+cfQSJjgy2nALjLqk4sN9ks0bDRbpg0DU4SVhWD7u0QiexO MWj1u2LkU3poiQKxmm+3UU6cyXtSCEcUP1o8Aa7iHfb1JHR6Mb0r/aigFiDH2Yh4 4rUoBhhykWJ6YXbL0tS2CG346Ict6EfESL2MaLlW1TxWxMsI231nIj799LFhfFyx ItDT7vPCemYk+iu69R/tNtazF17ZDnXGWeikmgQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:sender:list-id; s=arctest; t=1516208193; bh=JpCzMmgOY65ltvjJZTjhKPonhBfl6hyO2rDsPtt7kko=; b=TT6FE7PCPUnz 2t2rD1lBEilVr/RQMx054Gs1lGhUZ4tuJEAPmJofTtrNW+0hvBVunUx0bs5R0Rku Dnj5zwq6BsYZA2/CGZTHtTkjv02aHwlesi3e35975lb0DnnmfNgmQ02JRR07VV6h 60ku8TWqwt/ScvpQXL+JrI/BFvr/vTWiHez0S+Y25ri3Ex0IYETBtp6ZzkMo87iw saLVQDdvDq+/eC0ku1uV2pgdUOXdqL1V5yZRpzAiLHMnucGe+0T8jr1tbCzPKIJ1 11nVKbg2pcWfRzNNedNM9MrPgUkM6agg+nhBAiHI3ew7Jp8Uhhm/dhOmVnBI/GX1 6KoxKbTj1g== ARC-Authentication-Results: i=1; mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=efficios.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=efficios.com header.result=pass header_is_org_domain=yes Authentication-Results: mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=efficios.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=efficios.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754204AbeAQQ43 (ORCPT ); Wed, 17 Jan 2018 11:56:29 -0500 Received: from mail.efficios.com ([167.114.142.141]:46381 "EHLO mail.efficios.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754150AbeAQQ40 (ORCPT ); Wed, 17 Jan 2018 11:56:26 -0500 From: Mathieu Desnoyers To: Ingo Molnar , Peter Zijlstra , Thomas Gleixner Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, Andy Lutomirski , "Paul E . McKenney" , Boqun Feng , Andrew Hunter , Maged Michael , Avi Kivity , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Dave Watson , "H . Peter Anvin" , Andrea Parri , Russell King , Greg Hackmann , Will Deacon , David Sehr , Linus Torvalds , x86@kernel.org, Mathieu Desnoyers , linux-arch@vger.kernel.org Subject: [PATCH for 4.16 06/11] Introduce sync_core_before_usermode Date: Wed, 17 Jan 2018 11:54:53 -0500 Message-Id: <20180117165458.13330-7-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180117165458.13330-1-mathieu.desnoyers@efficios.com> References: <20180117165458.13330-1-mathieu.desnoyers@efficios.com> Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Introduce an architecture function that ensures the current CPU issues a core serializing instruction before returning to usermode. This is needed for the membarrier "sync_core" command. Architectures defining the sync_core_before_usermode() static inline need to select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE. Signed-off-by: Mathieu Desnoyers CC: Thomas Gleixner CC: Peter Zijlstra CC: Andy Lutomirski CC: Paul E. McKenney CC: Boqun Feng CC: Andrew Hunter CC: Maged Michael CC: Avi Kivity CC: Benjamin Herrenschmidt CC: Paul Mackerras CC: Michael Ellerman CC: Dave Watson CC: Ingo Molnar CC: "H. Peter Anvin" CC: Andrea Parri CC: Russell King CC: Greg Hackmann CC: Will Deacon CC: David Sehr CC: Linus Torvalds CC: x86@kernel.org CC: linux-arch@vger.kernel.org --- include/linux/processor.h | 6 ++++++ init/Kconfig | 3 +++ 2 files changed, 9 insertions(+) diff --git a/include/linux/processor.h b/include/linux/processor.h index dbc952eec869..866de5326d34 100644 --- a/include/linux/processor.h +++ b/include/linux/processor.h @@ -68,4 +68,10 @@ do { \ #endif +#ifndef CONFIG_ARCH_HAS_SYNC_CORE_BEFORE_USERMODE +static inline void sync_core_before_usermode(void) +{ +} +#endif + #endif /* _LINUX_PROCESSOR_H */ diff --git a/init/Kconfig b/init/Kconfig index 2d118b6adee2..30208da2221f 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1918,3 +1918,6 @@ config ASN1 functions to call on what tags. source "kernel/Kconfig.locks" + +config ARCH_HAS_SYNC_CORE_BEFORE_USERMODE + bool -- 2.11.0