mm, devm_memremap_pages: kill mapping "System RAM" support

Given the fact that devm_memremap_pages() requires a percpu_ref that is
torn down by devm_memremap_pages_release() the current support for mapping
RAM is broken.

Support for remapping "System RAM" has been broken since the beginning and
there is no existing user of this this code path, so just kill the support
and make it an explicit error.

This cleanup also simplifies a follow-on patch to fix the error path when
setting a devm release action for devm_memremap_pages_release() fails.

Link: http://lkml.kernel.org/r/154275557997.76910.14689813630968180480.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: "Jérôme Glisse" <jglisse@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/memremap.c b/kernel/memremap.c
index 61dbcaa955306f7b2805de27389f5bbe136e9d45..99d14940acfa3007688a5ae356c22c23fb81d92e 100644 (file)
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -167,15 +167,12 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap)
        is_ram = region_intersects(align_start, align_size,
                IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE);
 
-       if (is_ram == REGION_MIXED) {
-               WARN_ONCE(1, "%s attempted on mixed region %pr\n",
-                               __func__, res);
+       if (is_ram != REGION_DISJOINT) {
+               WARN_ONCE(1, "%s attempted on %s region %pr\n", __func__,
+                               is_ram == REGION_MIXED ? "mixed" : "ram", res);
                return ERR_PTR(-ENXIO);
        }
 
-       if (is_ram == REGION_INTERSECTS)
-               return __va(res->start);
-
        if (!pgmap->ref)
                return ERR_PTR(-EINVAL);