From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1D416C433FF for ; Mon, 5 Aug 2019 15:46:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DF9432086D for ; Mon, 5 Aug 2019 15:46:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="RPl/cWr4" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728086AbfHEPqA (ORCPT ); Mon, 5 Aug 2019 11:46:00 -0400 Received: from mail-wr1-f67.google.com ([209.85.221.67]:38997 "EHLO mail-wr1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727460AbfHEPqA (ORCPT ); Mon, 5 Aug 2019 11:46:00 -0400 Received: by mail-wr1-f67.google.com with SMTP id x4so31735092wrt.6 for ; Mon, 05 Aug 2019 08:45:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=v306sfwUGIVnriTquF2KCh9r0qG80xENrZcYr3yv41A=; b=RPl/cWr4ICJ1bdX1iZkG7X25CTPpq5Ar/WW0HcJ9gh5rqtkdD6q+0gjm3pYy80LHB7 ELw9Df1MB3ZM5DzXGQtjdAMPwyex8IiqdGKjuXDxFrQJJiog8knuUUCzGlQJkSJcylCN f6E625dTHPgYBXlqgrWGSayMZAOiXy9+KK4OP95Z7YdHJOXPvABdeursdLsGzp/xy5xx GN51bL/l/g3eajCja5cX2Mxp5mshzDQhFo/u1rKNq67lnuK0zeaPUW0EHObGBXr90fte cM1CkFfovDVjZ9WVP3wjmAgeQQhpPI9AXl0WHYSzW8KxOqc2Gwi+OhPu7VHmdfjfoovC YuMQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=v306sfwUGIVnriTquF2KCh9r0qG80xENrZcYr3yv41A=; b=JZTRWp/uEvmwVW4nxb/gmnryw4SGL4mtKdkjIeqQOVzXNxthtLYBmSKgIap0zH8yIC HeDkPmaAnme9ACsvLvks9EdV/+gNoguYaFH9Z7CGNsRCrKgxVjQBja3IAzlKceBCdVzZ 8KgWHMbbHFLS78N2f//d/18kPaczb1/t2oncn6goq/foYx40P+gwuXyBCHSFxw8gjN0Y YvRubR7WosUfEQ21iZfBW/VFO+6LPgbyO1xem79ZPeHC1pUrQBtyX4ZV6dVNxqaPedCG oYXsvCOEOe3dpxmeSlJTHkH70ogz5fWSPgwdCNZCxgzJTlLUz5/E0Z1OfKv0joBHBCVS pVdQ== X-Gm-Message-State: APjAAAX5pb7Pt5rH8gKQuBgLR4Fe9qVwT7fO7h2GOAkDOJBaQJcaKWR9 TMXzqlvzcKArUW5Db6AJgkc= X-Google-Smtp-Source: APXvYqyiVh4JW9BAxeQmV7Ga2Y/xwkIkFOdeQDansqXZR5hzlhxtXw4izgVGV95M9bxc9zQCbGMijQ== X-Received: by 2002:a5d:4090:: with SMTP id o16mr6149082wrp.292.1565019958047; Mon, 05 Aug 2019 08:45:58 -0700 (PDT) Received: from abel.fritz.box ([2a02:908:1252:fb60:fdbd:6233:4990:5a8d]) by smtp.gmail.com with ESMTPSA id 91sm171836865wrp.3.2019.08.05.08.45.57 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 05 Aug 2019 08:45:57 -0700 (PDT) From: "=?UTF-8?q?Christian=20K=C3=B6nig?=" X-Google-Original-From: =?UTF-8?q?Christian=20K=C3=B6nig?= To: intel-gfx@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, chris@chris-wilson.co.uk Subject: [PATCH 3/5] dma-buf: further relax reservation_object_add_shared_fence Date: Mon, 5 Aug 2019 17:45:52 +0200 Message-Id: <20190805154554.3476-3-christian.koenig@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190805154554.3476-1-christian.koenig@amd.com> References: <20190805154554.3476-1-christian.koenig@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Other cores don't busy wait any more and we removed the last user of checking the seqno for changes. Drop updating the number for shared fences altogether. Signed-off-by: Christian König --- drivers/dma-buf/reservation.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c index d59207ca72d2..6eaca469005f 100644 --- a/drivers/dma-buf/reservation.c +++ b/drivers/dma-buf/reservation.c @@ -206,9 +206,6 @@ void reservation_object_add_shared_fence(struct reservation_object *obj, fobj = reservation_object_get_list(obj); count = fobj->shared_count; - preempt_disable(); - write_seqcount_begin(&obj->seq); - for (i = 0; i < count; ++i) { old = rcu_dereference_protected(fobj->shared[i], @@ -226,9 +223,6 @@ void reservation_object_add_shared_fence(struct reservation_object *obj, RCU_INIT_POINTER(fobj->shared[i], fence); /* pointer update must be visible before we extend the shared_count */ smp_store_mb(fobj->shared_count, count); - - write_seqcount_end(&obj->seq); - preempt_enable(); dma_fence_put(old); } EXPORT_SYMBOL(reservation_object_add_shared_fence); -- 2.17.1