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SubjectRe: [PATCH v3] mm: Fix the problem of mips architecture Oops
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@uniontech.com>
> ---
> 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 ]

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