Not getting printk output

Not getting printk output

[Mayank]

Hi,
	I am trying to print something to the kernel debug log level using
printk, but while using dmesg i am not getting the output on the
console. My /proc/sys/kernel/printk setting is 4 4 1 7.
Please help

Thanks,
Mayank

Not getting printk output

[karthik nayak]

Hello,
What debug level are you using with printk.
Regards,
Karthik

On Sun Nov 23 2014 at 11:38:39 AM Mayank <mskernel@yahoo.in> wrote:

> Hi,
>         I am trying to print something to the kernel debug log level using
> printk, but while using dmesg i am not getting the output on the
> console. My /proc/sys/kernel/printk setting is 4 4 1 7.
> Please help
>
> Thanks,
> Mayank
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
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Not getting printk output

[Philipp Muhoray]

Am 2014-11-23 um 06:58 schrieb Mayank:
> Hi,
> 	I am trying to print something to the kernel debug log level using
> printk, but while using dmesg i am not getting the output on the
> console. My /proc/sys/kernel/printk setting is 4 4 1 7.
> Please help
>
> Thanks,
> Mayank
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

Hello,

Does your string end with the newline character '\n'? Otherwise your 
output will not be flushed immediately (it remains in the buffer). So try

     printk(KERN_DEBUG "Hello World!\n");

Maybe that helps.

br,
phil

Not getting printk output

[karthik nayak]

Hello,
Use the new macros such as pr_info(), pr_debug() and so on.

On Sun Nov 23 2014 at 2:04:27 PM Philipp Muhoray <philipp.muhoray@gmail.com>
wrote:

>
> Am 2014-11-23 um 06:58 schrieb Mayank:
> > Hi,
> >       I am trying to print something to the kernel debug log level using
> > printk, but while using dmesg i am not getting the output on the
> > console. My /proc/sys/kernel/printk setting is 4 4 1 7.
> > Please help
> >
> > Thanks,
> > Mayank
> >
> >
> > _______________________________________________
> > Kernelnewbies mailing list
> > Kernelnewbies at kernelnewbies.org
> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
> Hello,
>
> Does your string end with the newline character '\n'? Otherwise your
> output will not be flushed immediately (it remains in the buffer). So try
>
>      printk(KERN_DEBUG "Hello World!\n");
>
> Maybe that helps.
>
> br,
> phil
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
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Not getting printk output

[Vignesh Radhakrishnan]

Use pr_info() or pr_err() for getting it printed definitely as suggested.
The caveat with pr_debug() is that, messages will only be printed in case
you have dynamic debug control for that file enabled.(same goes with
printk(KERN_DEBUG ).



On Sun, Nov 23, 2014 at 6:49 PM, karthik nayak <karthik.188@gmail.com>
wrote:

> Hello,
> Use the new macros such as pr_info(), pr_debug() and so on.
>
>
> On Sun Nov 23 2014 at 2:04:27 PM Philipp Muhoray <
> philipp.muhoray at gmail.com> wrote:
>
>>
>> Am 2014-11-23 um 06:58 schrieb Mayank:
>> > Hi,
>> >       I am trying to print something to the kernel debug log level using
>> > printk, but while using dmesg i am not getting the output on the
>> > console. My /proc/sys/kernel/printk setting is 4 4 1 7.
>> > Please help
>> >
>> > Thanks,
>> > Mayank
>> >
>> >
>> > _______________________________________________
>> > Kernelnewbies mailing list
>> > Kernelnewbies at kernelnewbies.org
>> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>> Hello,
>>
>> Does your string end with the newline character '\n'? Otherwise your
>> output will not be flushed immediately (it remains in the buffer). So try
>>
>>      printk(KERN_DEBUG "Hello World!\n");
>>
>> Maybe that helps.
>>
>> br,
>> phil
>>
>> _______________________________________________
>> Kernelnewbies mailing list
>> Kernelnewbies at kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>


-- 
http://vigneshradhakrishnan.blogspot.com/
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