From patchwork Tue Nov 8 00:31:39 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vineet Gupta X-Patchwork-Id: 692121 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3tCVd80nz9z9t5m for ; Tue, 8 Nov 2016 11:32:28 +1100 (AEDT) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 63C8B2FA99; Tue, 8 Nov 2016 00:32:24 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jCN3YvDPAQsB; Tue, 8 Nov 2016 00:32:16 +0000 (UTC) Received: from ash.osuosl.org (ash.osuosl.org [140.211.166.34]) by silver.osuosl.org (Postfix) with ESMTP id A017630898; Tue, 8 Nov 2016 00:32:09 +0000 (UTC) X-Original-To: uclibc@lists.busybox.net Delivered-To: uclibc@osuosl.org Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by ash.osuosl.org (Postfix) with ESMTP id E49781C0677 for ; Tue, 8 Nov 2016 00:32:02 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id CD0C23013C for ; Tue, 8 Nov 2016 00:32:02 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LmaOieCQO30n for ; Tue, 8 Nov 2016 00:31:59 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from smtprelay.synopsys.com (us01smtprelay-2.synopsys.com [198.182.60.111]) by silver.osuosl.org (Postfix) with ESMTPS id 161D42F7CF for ; Tue, 8 Nov 2016 00:31:58 +0000 (UTC) Received: from mailhost.synopsys.com (mailhost3.synopsys.com [10.12.238.238]) by smtprelay.synopsys.com (Postfix) with ESMTP id DA9D310C0E69; Mon, 7 Nov 2016 16:31:57 -0800 (PST) Received: from mailhost.synopsys.com (localhost [127.0.0.1]) by mailhost.synopsys.com (Postfix) with ESMTP id C51A6BA; Mon, 7 Nov 2016 16:31:57 -0800 (PST) Received: from us01wehtc1.internal.synopsys.com (us01wehtc1-vip.internal.synopsys.com [10.12.239.236]) by mailhost.synopsys.com (Postfix) with ESMTP id B5CC3B9; Mon, 7 Nov 2016 16:31:57 -0800 (PST) Received: from IN01WEHTCA.internal.synopsys.com (10.144.199.104) by us01wehtc1.internal.synopsys.com (10.12.239.235) with Microsoft SMTP Server (TLS) id 14.3.266.1; Mon, 7 Nov 2016 16:31:57 -0800 Received: from IN01WEHTCB.internal.synopsys.com (10.144.199.105) by IN01WEHTCA.internal.synopsys.com (10.144.199.103) with Microsoft SMTP Server (TLS) id 14.3.266.1; Tue, 8 Nov 2016 06:01:54 +0530 Received: from vineetg-Latitude-E7450.internal.synopsys.com (10.10.161.65) by IN01WEHTCB.internal.synopsys.com (10.144.199.243) with Microsoft SMTP Server (TLS) id 14.3.266.1; Tue, 8 Nov 2016 06:01:54 +0530 From: Vineet Gupta To: Subject: [PATCH 2/3] ARC: introduce explicit support for atomics Date: Mon, 7 Nov 2016 16:31:39 -0800 Message-ID: <1478565100-23924-3-git-send-email-vgupta@synopsys.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1478565100-23924-1-git-send-email-vgupta@synopsys.com> References: <1478565100-23924-1-git-send-email-vgupta@synopsys.com> MIME-Version: 1.0 X-Originating-IP: [10.10.161.65] Cc: uclibc@uclibc.org, Vineet Gupta , Alexey.Brodkin@synopsys.com X-BeenThere: uclibc@uclibc.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "Discussion and development of uClibc \(the embedded C library\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: uclibc-bounces@uclibc.org Sender: "uClibc" Signed-off-by: Vineet Gupta --- extra/Configs/Config.arc | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/extra/Configs/Config.arc b/extra/Configs/Config.arc index 0c0bc71ce2fc..c263dbf46028 100644 --- a/extra/Configs/Config.arc +++ b/extra/Configs/Config.arc @@ -28,6 +28,14 @@ config CONFIG_ARC_CPU_HS endchoice +config CONFIG_ARC_HAS_ATOMICS + bool "Support for LLOCK/SCOND instructions" + default y + help + LLOCK/SCOND instructions are needed to implement atomic r-m-w + Otherwise libc needs kernel assisted atomic cmpxchg available + since v4.9 kernel + choice prompt "MMU Page Size" default CONFIG_ARC_PAGE_SIZE_8K