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Message-Id: <20230725141602.7759-1-l3b2w1@gmail.com>
Date: Tue, 25 Jul 2023 22:16:02 +0800
From: Binglei Wang <l3b2w1@...il.com>
To: hch@....de
Cc: m.szyprowski@...sung.com, robin.murphy@....com,
iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
l3b2w1@...il.com
Subject: [PATCH v2] cma: check for memory region overlapping
From: l3b2w1 <l3b2w1@...il.com>
Add a overlapping check in the program flow of paring dts.
Check if cma area overlaps with memblock-reserved areas
(kenrel code area for example)before calling
early_init_fdt_scan_reserved_mem.
Signed-off-by: l3b2w1 <l3b2w1@...il.com>
---
Notes:
v2: delete the logic code for handling return EBUSY.
v1: return EBUSY when detect overlapping and handle the return case.
kernel/dma/contiguous.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c
index 6ea80ae42..20ebbcefd 100644
--- a/kernel/dma/contiguous.c
+++ b/kernel/dma/contiguous.c
@@ -410,6 +410,11 @@ static int __init rmem_cma_setup(struct reserved_mem *rmem)
return -EBUSY;
}
+ if (memblock_is_region_reserved(rmem->base, rmem->size)) {
+ pr_info("Reserved memory: overlap with other memblock reserved region\n",
+ return -EBUSY;
+ }
+
if (!of_get_flat_dt_prop(node, "reusable", NULL) ||
of_get_flat_dt_prop(node, "no-map", NULL))
return -EINVAL;
--
2.39.0
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