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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190906140123.GA9894@lst.de> 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=623 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909060152 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=676 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1909060152 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190906_071915_379570_AB28E90B X-CRM114-Status: GOOD ( 19.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , Stefano Stabellini , Konrad Rzeszutek Wilk , x86@kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, xen-devel@lists.xenproject.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 If this goes via Xen tree then the first couple of patches need an ack from ARM maintainers. -boris _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel