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| author | zhanglianjie <zhanglianjie@uniontech.com> | 2021-06-28 17:11:05 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-19 09:44:55 +0200 |
| commit | ff4762bcb95ea9d1427c9c2dc6e434b0fd93a64e (patch) | |
| tree | 502618111bd37c1d38921a69c798cd4e1ceb9289 /arch/mips | |
| parent | 6ef81a5c0e22233e13c748e813c54d3bf0145782 (diff) | |
| download | linux-stable-ff4762bcb95ea9d1427c9c2dc6e434b0fd93a64e.tar.gz linux-stable-ff4762bcb95ea9d1427c9c2dc6e434b0fd93a64e.tar.bz2 linux-stable-ff4762bcb95ea9d1427c9c2dc6e434b0fd93a64e.zip | |
MIPS: loongsoon64: Reserve memory below starting pfn to prevent Oops
[ Upstream commit 6817c944430d00f71ccaa9c99ff5b0096aeb7873 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/loongson64/numa.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/mips/loongson64/numa.c b/arch/mips/loongson64/numa.c index cf9459f79f9b..e4c461df3ee6 100644 --- a/arch/mips/loongson64/numa.c +++ b/arch/mips/loongson64/numa.c @@ -182,6 +182,9 @@ 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); } } |