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Subject[PATCH] mm: Fix the problem of mips architecture Oops
Date
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>
---
arch/mips/kernel/setup.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 23a140327a0b..f1da2b2ba5e9 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -653,6 +653,8 @@ static void __init arch_mem_init(char **cmdline_p)
*/
memblock_set_current_limit(PFN_PHYS(max_low_pfn));

+ memblock_reserve(0, PAGE_SIZE * NODE_DATA(0)->node_start_pfn);
+
mips_reserve_vmcore();

mips_parse_crashkernel();
--
2.20.1


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