[PATCH v3 3/3] mm: Change __remove_pages() to call release_mem_region_adjustable()

[Toshi Kani]

Changed __remove_pages() to call release_mem_region_adjustable().
This allows a requested memory range to be released from
the iomem_resource table even if it does not match exactly to
an resource entry but still fits into.  The resource entries
initialized at bootup usually cover the whole contiguous
memory ranges and may not necessarily match with the size of
memory hot-delete requests.

If release_mem_region_adjustable() failed, __remove_pages() emits
a warning message and continues to proceed as it was the case
with release_mem_region().  release_mem_region(), which is defined
to __release_region(), emits a warning message and returns no error
since a void function.

Signed-off-by: Toshi Kani <toshi.kani@xxxxxx>
Reviewed-by : Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
---
 mm/memory_hotplug.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 57decb2..c916582 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -705,8 +705,10 @@ EXPORT_SYMBOL_GPL(__add_pages);
 int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
 		 unsigned long nr_pages)
 {
-	unsigned long i, ret = 0;
+	unsigned long i;
 	int sections_to_remove;
+	resource_size_t start, size;
+	int ret = 0;
 
 	/*
 	 * We can only remove entire sections
@@ -714,7 +716,12 @@ int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
 	BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK);
 	BUG_ON(nr_pages % PAGES_PER_SECTION);
 
-	release_mem_region(phys_start_pfn << PAGE_SHIFT, nr_pages * PAGE_SIZE);
+	start = phys_start_pfn << PAGE_SHIFT;
+	size = nr_pages * PAGE_SIZE;
+	ret = release_mem_region_adjustable(&iomem_resource, start, size);
+	if (ret)
+		pr_warn("Unable to release resource <%016llx-%016llx> (%d)\n",
+				start, start + size - 1, ret);
 
 	sections_to_remove = nr_pages / PAGES_PER_SECTION;
 	for (i = 0; i < sections_to_remove; i++) {
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/