linux-kernel - [PATCH 3.18 12/24] mm: cma: fix totalcma_pages to include DT defined CMA regions

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Date:   Thu, 31 Aug 2017 17:43:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "George G. Davis" <george_davis@...tor.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Michal Nazarewicz <mina86@...a86.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 3.18 12/24] mm: cma: fix totalcma_pages to include DT defined CMA regions

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: George G. Davis <ggdavisiv@...il.com>

commit 94737a85f332aee75255960eaa16e89ddfa4c75a upstream.

The totalcma_pages variable is not updated to account for CMA regions
defined via device tree reserved-memory sub-nodes.  Fix this omission by
moving the calculation of totalcma_pages into cma_init_reserved_mem()
instead of cma_declare_contiguous() such that it will include reserved
memory used by all CMA regions.

Signed-off-by: George G. Davis <george_davis@...tor.com>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Acked-by: Michal Nazarewicz <mina86@...a86.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 mm/cma.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/cma.c
+++ b/mm/cma.c
@@ -200,6 +200,7 @@ int __init cma_init_reserved_mem(phys_ad
 	cma->order_per_bit = order_per_bit;
 	*res_cma = cma;
 	cma_area_count++;
+	totalcma_pages += (size / PAGE_SIZE);

 	return 0;
 }
@@ -338,7 +339,6 @@ int __init cma_declare_contiguous(phys_a
 	if (ret)
 		goto err;

-	totalcma_pages += (size / PAGE_SIZE);
 	pr_info("Reserved %ld MiB at %pa\n", (unsigned long)size / SZ_1M,
 		&base);
 	return 0;