From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:61960 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726040AbfGRRVe (ORCPT ); Thu, 18 Jul 2019 13:21:34 -0400 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x6IHIu8Q027278 for ; Thu, 18 Jul 2019 13:21:33 -0400 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0b-001b2d01.pphosted.com with ESMTP id 2ttuv4u31j-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 18 Jul 2019 13:21:33 -0400 Received: from localhost by e06smtp03.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 18 Jul 2019 18:21:31 +0100 From: Halil Pasic Subject: [PATCH 1/1] s390/dma: provide proper ARCH_ZONE_DMA_BITS value Date: Thu, 18 Jul 2019 19:21:20 +0200 Message-Id: <20190718172120.69947-1-pasic@linux.ibm.com> Sender: linux-s390-owner@vger.kernel.org List-ID: To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, Christoph Hellwig , Heiko Carstens , Vasily Gorbik Cc: Halil Pasic , Petr Tesarik , Christian Borntraeger , Janosch Frank On s390 ZONE_DMA is up to 2G, i.e. ARCH_ZONE_DMA_BITS should be 31 bits. The current value is 24 and makes __dma_direct_alloc_pages() take a wrong turn first (but __dma_direct_alloc_pages() recovers then). Let's correct ARCH_ZONE_DMA_BITS value and avoid wrong turns. Signed-off-by: Halil Pasic Reported-by: Petr Tesarik Fixes: c61e9637340e ("dma-direct: add support for allocation from ZONE_DMA and ZONE_DMA32") --- arch/s390/include/asm/dma.h | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/s390/include/asm/dma.h b/arch/s390/include/asm/dma.h index 6f26f35d4a71..3b0329665b13 100644 --- a/arch/s390/include/asm/dma.h +++ b/arch/s390/include/asm/dma.h @@ -10,6 +10,7 @@ * by the 31 bit heritage. */ #define MAX_DMA_ADDRESS 0x80000000 +#define ARCH_ZONE_DMA_BITS 31 #ifdef CONFIG_PCI extern int isa_dma_bridge_buggy; -- 2.17.1