From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: use generic DMA mapping code in powerpc V4 Date: Fri, 18 Jan 2019 09:35:39 +0100 Message-ID: <20190118083539.GA30479@lst.de> References: <3504ee70-02de-049e-6402-2d530bf55a84@xenosoft.de> <23284859-bf0a-9cd5-a480-2a7fd7802056@xenosoft.de> <075f70e3-7a4a-732f-b501-05a1a8e3c853@xenosoft.de> <21f72a6a-9095-7034-f169-95e876228b2a@xenosoft.de> <27148ac2-2a92-5536-d886-2c0971ab43d9@xenosoft.de> <20190115133558.GA29225@lst.de> <685f0c06-af1b-0bec-ac03-f9bf1f7a2b35@xenosoft.de> <20190115151732.GA2325@lst.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Christian Zigotzky Cc: Christoph Hellwig , linux-arch@vger.kernel.org, Darren Stevens , linux-kernel@vger.kernel.org, Julian Margetson , linux-mm@kvack.org, iommu@lists.linux-foundation.org, Paul Mackerras , Olof Johansson , linuxppc-dev@lists.ozlabs.org List-Id: iommu@lists.linux-foundation.org Hi Christian, can you check if the debug printks in this patch trigger? diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 355d16acee6d..e46c9b64ec0d 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -118,8 +118,11 @@ struct page *__dma_direct_alloc_pages(struct device *dev, size_t size, page = NULL; } } - if (!page) + if (!page) { page = alloc_pages_node(dev_to_node(dev), gfp, page_order); + if (!page) + pr_warn("failed to allocate memory with gfp 0x%x\n", gfp); + } if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) { __free_pages(page, page_order); @@ -139,6 +142,10 @@ struct page *__dma_direct_alloc_pages(struct device *dev, size_t size, } } + if (!page) { + pr_warn("failed to allocate DMA memory!\n"); + dump_stack(); + } return page; }