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authorzhanglianjie <zhanglianjie@uniontech.com>2021-06-28 12:11:05 +0300
committerThomas Bogendoerfer <tsbogend@alpha.franken.de>2021-06-29 11:15:46 +0300
commit6817c944430d00f71ccaa9c99ff5b0096aeb7873 (patch)
tree460efbb48ee8b188d1d6758e0e25a7fad5eedbf6 /arch/mips/loongson64
parentcad065ed8d8831df67b9754cc4437ed55d8b48c0 (diff)
downloadlinux-6817c944430d00f71ccaa9c99ff5b0096aeb7873.tar.xz
MIPS: loongsoon64: Reserve memory below starting pfn to prevent Oops
The cause of the problem is as follows: 1. when cat /sys/devices/system/memory/memory0/valid_zones, test_pages_in_a_zone() will be called. 2. test_pages_in_a_zone() finds the zone according to stat_pfn = 0. The smallest pfn of the numa node in the mips architecture is 128, and the page corresponding to the previous 0~127 pfn is not initialized (page->flags is 0xFFFFFFFF) 3. The nid and zonenum obtained using page_zone(pfn_to_page(0)) are out of bounds in the corresponding array, &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)], access to the out-of-bounds zone member variables appear abnormal, resulting in Oops. Therefore, it is necessary to keep the page between 0 and the minimum pfn to prevent Oops from appearing. Signed-off-by: zhanglianjie <zhanglianjie@uniontech.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips/loongson64')
-rw-r--r--arch/mips/loongson64/numa.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/mips/loongson64/numa.c b/arch/mips/loongson64/numa.c
index fa9b4a487a47..e8e3e48c5333 100644
--- a/arch/mips/loongson64/numa.c
+++ b/arch/mips/loongson64/numa.c
@@ -129,6 +129,9 @@ static void __init node_mem_init(unsigned int node)
if (node_end_pfn(0) >= (0xffffffff >> PAGE_SHIFT))
memblock_reserve((node_addrspace_offset | 0xfe000000),
32 << 20);
+
+ /* Reserve pfn range 0~node[0]->node_start_pfn */
+ memblock_reserve(0, PAGE_SIZE * start_pfn);
}
}