Kernel 5.9-rc regression.

[Zhou Yanjie]

Hi Thomas and list,

There is a strange phenomenon in kernel 5.9-rc: when using kernel 5.9-rc 
with debian 10 and running htop, the memory footprint will be displayed 
as 3.99T. When the actual memory footprint increases, the displayed 
value will be reduced to 3.98T, 3.97T etc. These phenomena have been 
confirmed in X1000, X1830, and JZ4780 (disable SMP), this phenomenon 
does not seem to affect the SMP processor. When the JZ4780 turn on SMP, 
the memory footprint will be displayed normally.


The following is the relevant log:

  CPU[*                         0.7%]   Tasks: 18, 4 thr; 1 running
  Mem[###*****************3.99T/120M]   Load average: 0.02 0.02 0.00
  Swp[                       0K/768M]   Uptime: 00:02:07

  PID USER      PRI  NI  VIRT   RES   SHR S CPU% MEM%   TIME+ Command
 1135 cu-neo     20   0  8872  3152  2724 R  1.3  2.6  0:00.06 htop
    1 root       20   0 16268  7940  6588 S  0.0  6.5  0:02.06 /sbin/init
  512 root       20   0 23932  6188  5408 S  0.0  5.0  0:00.30 
/lib/systemd/syst
  746 root       20   0 17124  3492  2956 S  0.0  2.8  0:00.17 
/lib/systemd/syst
  770 systemd-t  20   0 23524  5700  5040 S  0.0  4.6  0:00.02 
/lib/systemd/syst
  756 systemd-t  20   0 23524  5700  5040 S  0.0  4.6  0:00.22 
/lib/systemd/syst
  772 root       20   0  8832  2436  2252 S  0.0  2.0  0:00.01 
/usr/sbin/cron -f
  773 root       20   0 14224  5812  5152 S  0.0  4.7  0:00.14 
/lib/systemd/syst
  774 messagebu  20   0  7392  4056  3628 S  0.0  3.3  0:00.20 
/usr/bin/dbus-dae
  775 root       20   0 12256  5096  4644 S  0.0  4.2  0:00.06 
/sbin/wpa_supplic
  793 root       20   0 25152  3844  3112 S  0.0  3.1  0:00.01 
/usr/sbin/rsyslog
  794 root       20   0 25152  3844  3112 S  0.0  3.1  0:00.00 
/usr/sbin/rsyslog
  795 root       20   0 25152  3844  3112 S  0.0  3.1  0:00.02 
/usr/sbin/rsyslog
  776 root       20   0 25152  3844  3112 S  0.0  3.1  0:00.06 
/usr/sbin/rsyslog
  821 root       20   0  8576  5492  4632 S  0.0  4.5  0:00.03 
/sbin/dhclient -4
  868 root       20   0  4524  1856  1748 S  0.0  1.5  0:00.01 
/sbin/agetty -o -
  871 root       20   0 11524  3820  3348 S  0.0  3.1  0:00.17 
/bin/login -p --
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