How to enable the print timestamping in dmesg

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Hi, 

When I dmesg in my ubuntu machine it gave a time stamp in front of the
printk's. I want to know how to enable this in powerpc and arm based
board for optimization. The sample dmesg log is below. 

[18142.277611] wlan0: associated 
[18409.007121] hda-intel: IRQ timing workaround is activated for card
#0. Suggest a bigger bdl_pos_adj. 
[18551.912525] wlan0: deauthenticated 
[18552.913635] wlan0: direct probe to AP 00:17:df:aa:78:d1 try 1 
[18552.916097] wlan0 direct probe responded 
[18552.916106] wlan0: authenticate with AP 00:17:df:aa:78:d1 
[18552.918654] wlan0: authenticated 
[18552.918663] wlan0: associate with AP 00:17:df:aa:78:d1 
[18552.920831] wlan0: RX ReassocResp from 00:17:df:aa:78:d1 (capab=0x421
status=0 aid=102) 
[18552.920838] wlan0: associated 
[18964.845121] wlan0: deauthenticated 
[18965.844063] wlan0: direct probe to AP 00:17:df:aa:78:d1 try 1 
[18965.845462] wlan0 direct probe responded 
[18965.845471] wlan0: authenticate with AP 00:17:df:aa:78:d1 
[18965.846964] wlan0: authenticated 
[18965.846970] wlan0: associate with AP 00:17:df:aa:78:d1 
[18965.849496] wlan0: RX ReassocResp from 00:17:df:aa:78:d1 (capab=0x421
status=0 aid=113) 
[18965.849501] wlan0: associated

-- 
H M Thalib


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