On Mon, Jun 28, 2021 at 05:11:05PM +0800, 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@xxxxxxxxxxxxx> > --- > arch/mips/loongson64/numa.c | 3 +++ > 1 file changed, 3 insertions(+) applied to mips-next (with subject changed to reflect what patch does). Thomas. -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ]
