Messages in this thread | | | Subject | Re: [PATCH v2] mm: Fix the problem of mips architecture Oops | From | Sergei Shtylyov <> | Date | Mon, 28 Jun 2021 11:51:02 +0300 |
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Hello!
On 28.06.2021 8:47, zhanglianjie wrote:
> 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/loongson64/numa.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/mips/loongson64/numa.c b/arch/mips/loongson64/numa.c > index fa9b4a487a47..dba9e6f17b9e 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); > + > + /* Reserver pfn range 0~node[0]->node_start_pfn */
Reserve?
> + memblock_reserve(0, PAGE_SIZE * start_pfn); > } > } [...]
MBR, Sergei
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