RE: [RFC V2] Free the reserved memblock when free cma pages

["Wang, Yalin" <Yalin.Wang@sonymobile.com>]

This patch add memblock_free to also free the reserved memblock,
so that the cma pages are not marked as reserved memory in
/sys/kernel/debug/memblock/reserved debug file

Signed-off-by: Yalin Wang <yalin.wang@sonymobile.com>
---
 mm/cma.c        | 6 +++++-
 mm/page_alloc.c | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/cma.c b/mm/cma.c
index c17751c..ec69c69 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -196,7 +196,11 @@ int __init cma_declare_contiguous(phys_addr_t base,
 	if (!IS_ALIGNED(size >> PAGE_SHIFT, 1 << order_per_bit))
 		return -EINVAL;
 
-	/* Reserve memory */
+	/*
+	 * Reserve memory, and the reserved memory are marked as reserved by
+	 * memblock driver, remember to clear the reserved status when free
+	 * these cma pages, see init_cma_reserved_pageblock()
+	 */
 	if (base && fixed) {
 		if (memblock_is_region_reserved(base, size) ||
 		    memblock_reserve(base, size) < 0) {
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 18cee0d..fffbb84 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -836,8 +836,8 @@ void __init init_cma_reserved_pageblock(struct page *page)
 		set_page_refcounted(page);
 		__free_pages(page, pageblock_order);
 	}
-
 	adjust_managed_page_count(page, pageblock_nr_pages);
+	memblock_free(page_to_phys(page), pageblock_nr_pages << PAGE_SHIFT);
 }
 #endif
 
-- 
2.1.0