Re: [PATCH 6/13] devres: implement managed iomap interface

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Tejun Heo wrote:

+/**
+ * devm_ioremap - Managed ioremap()
+ * @dev: Generic device to remap IO address for
+ * @offset: BUS offset to map
+ * @size: Size of map
+ *
+ * Managed ioremap().  Map is automatically unmapped on driver detach.
+ */
+void __iomem *devm_ioremap(struct device *dev, unsigned long offset,
+			   unsigned long size)
+{
+	void __iomem **ptr, *addr;
+
+	ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return NULL;
+
+	addr = ioremap(offset, size);
+	if (addr) {
+		*ptr = addr;
+		devres_add(dev, ptr);
+	} else
+		devres_free(ptr);
+
+	return addr;
+}
+EXPORT_SYMBOL(devm_ioremap);
+
+/**
+ * devm_ioremap_nocache - Managed ioremap_nocache()
+ * @dev: Generic device to remap IO address for
+ * @offset: BUS offset to map
+ * @size: Size of map
+ *
+ * Managed ioremap_nocache().  Map is automatically unmapped on driver
+ * detach.
+ */
+void __iomem *devm_ioremap_nocache(struct device *dev, unsigned long offset,
+				   unsigned long size)
+{
+	void __iomem **ptr, *addr;
+
+	ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return NULL;
+
+	addr = ioremap_nocache(offset, size);
+	if (addr) {
+		*ptr = addr;
+		devres_add(dev, ptr);
+	} else
+		devres_free(ptr);
+
+	return addr;
+}
+EXPORT_SYMBOL(devm_ioremap_nocache);

   A very late comment but nevertheless... :-)
Those functions are going to break on 32-bit platforms with extended physical address (well, that's starting with Pentiums which had 36-bit PAE :-) AND devices mapped beyond 4 GB (e.g. PowerPC 44x). You should have used resource_size_t for the 'offset' parameter. As this most probably means that libata is broken on such platforms, I'm going to submit a patch...

WBR, Sergei
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