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