Tao Zeng c432ed2742 mm: fix compound page header problem [2/2] ...

PD#SWPL-131211

Problem:
kernel crash in check_page_to_cma

Solution:
The problem is that page_mapping function returns a invalid mapping
pointer, when a compound page is building while a compaction is doing
at same time, there will have a risk of compound page status checking.
page->mapping is set to TAIL_MAPPING first then set compound header.
But check_page_to_cma don't check real status of page, which caused
panic

Verify:
local

Change-Id: Id44ac3d43d1385148e0527b0ba4d3421c68d825e
Signed-off-by: Tao Zeng <tao.zeng@amlogic.com>

2023-09-13 16:22:33 +08:00

..

amlogic

mm: fix compound page header problem [2/2]

2023-09-13 16:22:33 +08:00