Re: [PATCH] MIPS: vdso: flush the vdso data page to update it on all processes

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Hello.

On 2/21/2016 3:57 PM, Hauke Mehrtens wrote:

Without flushing the vdso data page the vdso call is working on dated
or unsynced data. This resulted in problems where the clock_gettime
vdso call returned a time 6 seconds later after a 3 sounds sleep,
while the syscall reported a time 3 sounds later like expected. This

   s/sounds/seconds/ perhaps?

happened very often and I got these ping results for example:

root@OpenWrt:/# ping 192.168.1.255
PING 192.168.1.255 (192.168.1.255): 56 data bytes
64 bytes from 192.168.1.3: seq=0 ttl=64 time=0.688 ms
64 bytes from 192.168.1.3: seq=1 ttl=64 time=4294172.045 ms
64 bytes from 192.168.1.3: seq=2 ttl=64 time=4293968.105 ms
64 bytes from 192.168.1.3: seq=3 ttl=64 time=4294055.920 ms
64 bytes from 192.168.1.3: seq=4 ttl=64 time=4294671.913 ms

The flush is now done like it is done on the arm architecture code.

This was tested on a Lantiq/Intel VRX288 (MIPS BE 34Kc V5.6 CPU with
two VPEs)

Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v4.4+
[...]

MBR, Sergei

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