lkml.org 
[lkml]   [2023]   [Jul]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2] cma: check for memory region overlapping
Date
From: l3b2w1 <l3b2w1@gmail.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@gmail.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
\
 
 \ /
  Last update: 2023-07-25 16:21    [W:0.085 / U:0.168 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site