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=-9.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 89BAEC06513 for ; Wed, 3 Jul 2019 18:45:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6819521852 for ; Wed, 3 Jul 2019 18:45:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="BlA5dAkf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727213AbfGCSpV (ORCPT ); Wed, 3 Jul 2019 14:45:21 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:57564 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727106AbfGCSpK (ORCPT ); Wed, 3 Jul 2019 14:45:10 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=R2IKJDEoBTtrdnvArsNvIg0bEouxs/Ep6eg9PGhct3U=; b=BlA5dAkfa9XMUD9jvGrc0232RZ iZAb/Solva5+7b6CeewDjYUi3nVNSc3Y5Vj+XgHfbDmlC0iu05TXVzvkPsP2zIAARSyEp/3hcr1jO sNbbIMUpAz7/1ee7T2ZFVL4l5/eeWDXxjn9SrSVxsrHm60pXcTj7Miq1xEyTOj5CkGTSwt9XJgdVd 9x90lGMU+wCDPzSCMRCB/Bfo9rxv07Aj4hz7ZCfkUdcS/DPpHVLrEfXievanIbqVwcRF70IRpMb2D 0Ocnxbgl710VUzNX3BNPFhddrHQVm9BDJ7VLcSx7rzf8TH2hoWntc7qJQxEL8IvzBO/8OxF7NRiNA 87ZsaxZw==; Received: from rap-us.hgst.com ([199.255.44.250] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hikFb-0007Bw-7r; Wed, 03 Jul 2019 18:45:03 +0000 From: Christoph Hellwig To: =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Jason Gunthorpe , Ben Skeggs Cc: linux-mm@kvack.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Ralph Campbell Subject: [PATCH 1/5] mm: return valid info from hmm_range_unregister Date: Wed, 3 Jul 2019 11:44:58 -0700 Message-Id: <20190703184502.16234-2-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190703184502.16234-1-hch@lst.de> References: <20190703184502.16234-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Checking range->valid is trivial and has no meaningful cost, but nicely simplifies the fastpath in typical callers. Also remove the hmm_vma_range_done function, which now is a trivial wrapper around hmm_range_unregister. Signed-off-by: Christoph Hellwig Reviewed-by: Ralph Campbell --- drivers/gpu/drm/nouveau/nouveau_svm.c | 2 +- include/linux/hmm.h | 11 +---------- mm/hmm.c | 7 ++++++- 3 files changed, 8 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_svm.c b/drivers/gpu/drm/nouveau/nouveau_svm.c index 8c92374afcf2..9d40114d7949 100644 --- a/drivers/gpu/drm/nouveau/nouveau_svm.c +++ b/drivers/gpu/drm/nouveau/nouveau_svm.c @@ -652,7 +652,7 @@ nouveau_svm_fault(struct nvif_notify *notify) ret = hmm_vma_fault(&svmm->mirror, &range, true); if (ret == 0) { mutex_lock(&svmm->mutex); - if (!hmm_vma_range_done(&range)) { + if (!hmm_range_unregister(&range)) { mutex_unlock(&svmm->mutex); goto again; } diff --git a/include/linux/hmm.h b/include/linux/hmm.h index b8a08b2a10ca..6b55e59fd8e3 100644 --- a/include/linux/hmm.h +++ b/include/linux/hmm.h @@ -462,7 +462,7 @@ int hmm_range_register(struct hmm_range *range, unsigned long start, unsigned long end, unsigned page_shift); -void hmm_range_unregister(struct hmm_range *range); +bool hmm_range_unregister(struct hmm_range *range); long hmm_range_snapshot(struct hmm_range *range); long hmm_range_fault(struct hmm_range *range, bool block); long hmm_range_dma_map(struct hmm_range *range, @@ -484,15 +484,6 @@ long hmm_range_dma_unmap(struct hmm_range *range, */ #define HMM_RANGE_DEFAULT_TIMEOUT 1000 -/* This is a temporary helper to avoid merge conflict between trees. */ -static inline bool hmm_vma_range_done(struct hmm_range *range) -{ - bool ret = hmm_range_valid(range); - - hmm_range_unregister(range); - return ret; -} - /* This is a temporary helper to avoid merge conflict between trees. */ static inline int hmm_vma_fault(struct hmm_mirror *mirror, struct hmm_range *range, bool block) diff --git a/mm/hmm.c b/mm/hmm.c index d48b9283725a..ac238d3f1f4e 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -917,11 +917,15 @@ EXPORT_SYMBOL(hmm_range_register); * * Range struct is used to track updates to the CPU page table after a call to * hmm_range_register(). See include/linux/hmm.h for how to use it. + * + * Return: %true if the range was still valid at the time of unregistering, + * else %false. */ -void hmm_range_unregister(struct hmm_range *range) +bool hmm_range_unregister(struct hmm_range *range) { struct hmm *hmm = range->hmm; unsigned long flags; + bool ret = range->valid; spin_lock_irqsave(&hmm->ranges_lock, flags); list_del_init(&range->list); @@ -938,6 +942,7 @@ void hmm_range_unregister(struct hmm_range *range) */ range->valid = false; memset(&range->hmm, POISON_INUSE, sizeof(range->hmm)); + return ret; } EXPORT_SYMBOL(hmm_range_unregister); -- 2.20.1