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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190906144300.GD7824@char.us.oracle.com> Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9372 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=738 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909060156 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9372 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=804 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909060157 Cc: Juergen Gross , Stefano Stabellini , x86@kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, xen-devel@lists.xenproject.org, Christoph Hellwig , linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org On 9/6/19 10:43 AM, Konrad Rzeszutek Wilk wrote: > On Fri, Sep 06, 2019 at 10:19:01AM -0400, Boris Ostrovsky wrote: >> On 9/6/19 10:01 AM, Christoph Hellwig wrote: >>> On Fri, Sep 06, 2019 at 09:52:12AM -0400, Boris Ostrovsky wrote: >>>> We need nop definitions of these two for x86. >>>> >>>> Everything builds now but that's probably because the calls are under >>>> 'if (!dev_is_dma_coherent(dev))' which is always false so compiler >>>> optimized is out. I don't think we should rely on that. >>> That is how a lot of the kernel works. Provide protypes only for code >>> that is semantically compiled, but can't ever be called due to >>> IS_ENABLED() checks. It took me a while to get used to it, but it >>> actually is pretty nice as the linker does the work for you to check >>> that it really is never called. Much better than say a BUILD_BUG_ON(). >> >> (with corrected Juergen's email) >> >> I know about IS_ENABLED() but I didn't realize that this is allowed for >> compile-time inlines and such as well. >> >> Anyway, for non-ARM bits >> >> Reviewed-by: Boris Ostrovsky > Acked-by: Konrad Rzeszutek Wilk > > as well. > > Albeit folks have tested this under x86 Xen with 'swiotlb=force' right? Yes, I did. -boris > > I can test it myself but it will take a couple of days. >> If this goes via Xen tree then the first couple of patches need an ack >> from ARM maintainers. >> >> -boris _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu