mm: Fix memory size alignment in devm_memremap_pages_release()

The functions devm_memremap_pages() and devm_memremap_pages_release() use
different ways to calculate the section-aligned amount of memory. The
latter function may use an incorrect size if the memory region is small
but straddles a section border.

Use the same code for both.

Cc: <stable@vger.kernel.org>
Fixes: 5f29a77cd957 ("mm: fix mixed zone detection in devm_memremap_pages")
Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/memremap.c b/kernel/memremap.c
index ada31b0d76d4..4ef97525a4ff 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -293,7 +293,8 @@ static void devm_memremap_pages_release(void *data)
 
         /* pages are dead and unused, undo the arch mapping */
         align_start = res->start & ~(SECTION_SIZE - 1);
-        align_size = ALIGN(resource_size(res), SECTION_SIZE);
+        align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE)
+                - align_start;
 
         mem_hotplug_begin();
         arch_remove_memory(align_start, align_size, pgmap->altmap_valid ?