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[173.79.56.208]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6eec9627e9bsm62509246d6.15.2025.04.01.07.44.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Apr 2025 07:44:19 -0700 (PDT) Date: Tue, 1 Apr 2025 10:44:17 -0400 From: Gregory Price To: David Hildenbrand Cc: linux-cxl@vger.kernel.org, nvdimm@lists.linux.dev, linux-kernel@vger.kernel.org, kernel-team@meta.com, dan.j.williams@intel.com, vishal.l.verma@intel.com, dave.jiang@intel.com Subject: Re: [PATCH] DAX: warn when kmem regions are truncated for memory block alignment. Message-ID: References: <20250321180731.568460-1-gourry@gourry.net> <88bce46e-a703-4935-b10e-638e33ea91b3@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <88bce46e-a703-4935-b10e-638e33ea91b3@redhat.com> On Tue, Apr 01, 2025 at 11:47:32AM +0200, David Hildenbrand wrote: > > Can't that be done a bit simpler? Yes, this is better, lets do this. Thank you! > > diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c > index e97d47f42ee2e..23a68ff809cdf 100644 > --- a/drivers/dax/kmem.c > +++ b/drivers/dax/kmem.c > @@ -67,8 +67,8 @@ static void kmem_put_memory_types(void) > static int dev_dax_kmem_probe(struct dev_dax *dev_dax) > { > + unsigned long total_len = 0, orig_len = 0; > struct device *dev = &dev_dax->dev; > - unsigned long total_len = 0; > struct dax_kmem_data *data; > struct memory_dev_type *mtype; > int i, rc, mapped = 0; > @@ -97,6 +97,7 @@ static int dev_dax_kmem_probe(struct dev_dax *dev_dax) > for (i = 0; i < dev_dax->nr_range; i++) { > struct range range; > + orig_len += range_len(&dev_dax->ranges[i].range); > rc = dax_kmem_range(dev_dax, i, &range); > if (rc) { > dev_info(dev, "mapping%d: %#llx-%#llx too small after alignment\n", > @@ -109,6 +110,9 @@ static int dev_dax_kmem_probe(struct dev_dax *dev_dax) > if (!total_len) { > dev_warn(dev, "rejecting DAX region without any memory after alignment\n"); > return -EINVAL; > + } else if (total_len != orig_len) { > + dev_warn(dev, "DAX region truncated by %lu bytes due to alignment\n", > + orig_len - total_len); > } > init_node_memory_type(numa_node, mtype); > > > -- > Cheers, > > David / dhildenb >