代码拉取完成，页面将自动刷新
The existed pGp shows the names of page flags only, rather than the full
information including section, node, zone, last cpuipid and kasan tag.
While it is not easy to parse these information manually because there
are so many flavors. We'd better interpret them in printf.
To be compitable with the existed format of pGp, the new introduced ones
also use '|' as the separator, then the user tools parsing pGp won't
need to make change, suggested by Matthew. The new added information is
tracked onto the end of the existed one, e.g.
[ 8838.835456] Slab 0x000000002828b78a objects=33 used=3 fp=0x00000000d04efc88 flags=0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)
The documentation and test cases are also updated. The result of the
test cases as follows,
[68599.816764] test_printf: loaded.
[68599.819068] test_printf: all 388 tests passed
[68599.830367] test_printf: unloaded.
This patchset also includes some code cleanup in mm/slub.c.
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openEuler-21.09分支合入如下相关补丁：
c01d3363a538 vsprintf: dump full information of page flags in pGp
e78374ae0321 mm, slub: don't combine pr_err with INFO
843505da5920 mm, slub: use pGp to print page flags
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