<div dir="ltr">Hi Wenda Ni,<div><br></div><div>Please go through the following link to enable debugging output.Seems you have missed enabling DEBUG in Makefile. Hope it will help you.</div><div><br></div><div><a href="https://www.kernel.org/doc/local/pr_debug.txt">https://www.kernel.org/doc/local/pr_debug.txt</a></div><div><br></div><div><pre style="color:rgb(0,0,0);word-wrap:break-word;white-space:pre-wrap"><i>CFLAGS_[filename].o := -DDEBUG</i>
</pre><div><br></div><div><br></div><div><br></div></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><p style="text-align:left"><font size="2"><span style="font-family:arial,helvetica,sans-serif"><b><span style="color:rgb(31,73,125)">With Best Regards,</span></b></span></font></p><p style="text-align:left"><font size="2"><span style="font-family:arial,helvetica,sans-serif"><span style="color:rgb(89,89,89)">Sukanya Ch</span></span></font></p><p style="text-align:left"><font size="2"><span style="font-family:arial,helvetica,sans-serif"><span style="color:rgb(89,89,89)">Software Engineer</span></span></font></p><p style="text-align:left"><font size="2"><span style="font-family:arial,helvetica,sans-serif"><span style="color:rgb(31,73,125)">VVDN Technologies Pvt Ltd</span></span></font></p><p style="text-align:left"><font size="2"><span style="font-family:arial,helvetica,sans-serif"><b><span style="color:rgb(31,73,125)">Cell : </span></b></span></font><span style="color:#1f497d"><font size="2"><span style="font-family:arial,helvetica,sans-serif">+91 9551955031 | <b>Skype :</b> sukanya.chinthamreddy</span></font><br></span></p> <span style="color:#1f497d"></span></div></div></div></div></div>
<br><div class="gmail_quote">On Tue, Oct 18, 2016 at 7:44 PM, <span dir="ltr"><<a href="mailto:kernelnewbies-request@kernelnewbies.org" target="_blank">kernelnewbies-request@kernelnewbies.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send Kernelnewbies mailing list submissions to<br>
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Today's Topics:<br>
<br>
1. kernel loglevel (Wenda Ni)<br>
2. Re: kernel loglevel (Wenda Ni)<br>
3. Re: kernel loglevel (Joel Fernandes)<br>
4. Re: kernel loglevel (Thibaut SAUTEREAU)<br>
5. Re: kernel loglevel (Wenda Ni)<br>
6. Fw: TPS65910 Regulator Isuue (Amit Mahadik)<br>
<br>
<br>
------------------------------<wbr>------------------------------<wbr>----------<br>
<br>
Message: 1<br>
Date: Mon, 17 Oct 2016 19:17:32 -0400<br>
From: Wenda Ni <<a href="mailto:wonda.ni@gmail.com">wonda.ni@gmail.com</a>><br>
Subject: kernel loglevel<br>
To: <a href="mailto:kernelnewbies@kernelnewbies.org">kernelnewbies@kernelnewbies.<wbr>org</a><br>
Message-ID:<br>
<CAEnvTt0RRDWtMD=<a href="mailto:VxVpuhiiJ%2BMRX2g3WiTgXkA-M5GGaTMyB-g@mail.gmail.com">VxVpuhiiJ+<wbr>MRX2g3WiTgXkA-M5GGaTMyB-g@<wbr>mail.gmail.com</a>><br>
Content-Type: text/plain; charset=UTF-8<br>
<br>
Dear all,<br>
<br>
I am working on a kernel module that incorporate both pr_debug and<br>
pr_warn. I would like to see pr_debug messages from dmesg.<br>
<br>
What I followed is to specify kernel parameter by saying "loglevel=7".<br>
This can be seen confirmed from /proc/cmdline. But still, I donot get<br>
pr_debug level messages either from dmesg or from /var/log/messages. I<br>
also tried echo 7 > /proc/sys/kernel/printk. It does not return what I<br>
expect, either.<br>
<br>
Let me know what I am missing. Thank you very much in advance.<br>
<br>
Cheers,<br>
<br>
Wenda Ni, Ph.D.<br>
<br>
<br>
<br>
------------------------------<br>
<br>
Message: 2<br>
Date: Mon, 17 Oct 2016 19:47:14 -0400<br>
From: Wenda Ni <<a href="mailto:wonda.ni@gmail.com">wonda.ni@gmail.com</a>><br>
Subject: Re: kernel loglevel<br>
To: Thibaut SAUTEREAU <<a href="mailto:thibaut.sautereau@telecom-sudparis.eu">thibaut.sautereau@telecom-<wbr>sudparis.eu</a>><br>
Cc: <a href="mailto:kernelnewbies@kernelnewbies.org">kernelnewbies@kernelnewbies.<wbr>org</a><br>
Message-ID:<br>
<<a href="mailto:CAEnvTt3oh%2BtuhKCwho8eZd5VmJfuXdcmWGpUpsjiH2wWSFpWvg@mail.gmail.com">CAEnvTt3oh+<wbr>tuhKCwho8eZd5VmJfuXdcmWGpUpsji<wbr>H2wWSFpWvg@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Thank you so much, Thibaut. I have spotted the source-code logic in<br>
include/linux/prink.h<br>
<br>
Cheers,<br>
<br>
Wenda Ni, Ph.D.<br>
<br>
<br>
<br>
On Mon, Oct 17, 2016 at 7:41 PM, Thibaut SAUTEREAU <<br>
<a href="mailto:thibaut.sautereau@telecom-sudparis.eu">thibaut.sautereau@telecom-<wbr>sudparis.eu</a>> wrote:<br>
> On Mon, Oct 17, 2016 at 07:17:32PM -0400, Wenda Ni wrote:<br>
>> Dear all,<br>
>><br>
>> I am working on a kernel module that incorporate both pr_debug and<br>
>> pr_warn. I would like to see pr_debug messages from dmesg.<br>
>><br>
>> What I followed is to specify kernel parameter by saying "loglevel=7".<br>
>> This can be seen confirmed from /proc/cmdline. But still, I donot get<br>
>> pr_debug level messages either from dmesg or from /var/log/messages. I<br>
>> also tried echo 7 > /proc/sys/kernel/printk. It does not return what I<br>
>> expect, either.<br>
>><br>
>> Let me know what I am missing. Thank you very much in advance.<br>
>><br>
>> Cheers,<br>
>><br>
>> Wenda Ni, Ph.D.<br>
>><br>
>> ______________________________<wbr>_________________<br>
>> Kernelnewbies mailing list<br>
>> <a href="mailto:Kernelnewbies@kernelnewbies.org">Kernelnewbies@kernelnewbies.<wbr>org</a><br>
>> <a href="https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies" rel="noreferrer" target="_blank">https://lists.kernelnewbies.<wbr>org/mailman/listinfo/<wbr>kernelnewbies</a><br>
><br>
> Hello Wenda,<br>
><br>
> I encountered the same issue a while ago.<br>
> As stated here: <a href="http://elinux.org/Debugging_by_printing" rel="noreferrer" target="_blank">http://elinux.org/Debugging_<wbr>by_printing</a><br>
> pr_debug is replaced with an empty statement unless the kernel is compiled<br>
> with DEBUG. So if you just want to play with printing kernel debug logs,<br>
> just define the DEBUG macro in your module source file for testing.<br>
><br>
> I also observed that without a new line character at the end of the string<br>
> passed to pr_debug, I could not find the log line in dmesg output. Not<br>
sure<br>
> where this comes from.<br>
><br>
> --<br>
> Thibaut SAUTEREAU<br>
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Message: 3<br>
Date: Mon, 17 Oct 2016 16:48:46 -0700<br>
From: Joel Fernandes <<a href="mailto:agnel.joel@gmail.com">agnel.joel@gmail.com</a>><br>
Subject: Re: kernel loglevel<br>
To: Wenda Ni <<a href="mailto:wonda.ni@gmail.com">wonda.ni@gmail.com</a>><br>
Cc: "<a href="mailto:kernelnewbies@kernelnewbies.org">kernelnewbies@kernelnewbies.<wbr>org</a>"<br>
<<a href="mailto:kernelnewbies@kernelnewbies.org">kernelnewbies@kernelnewbies.<wbr>org</a>><br>
Message-ID:<br>
<CAD=<a href="mailto:GYpb-UKodnqeb0o71KytF_M2pLGV7bRzZ3YL4Ck0GqLdU%2BA@mail.gmail.com">GYpb-UKodnqeb0o71KytF_<wbr>M2pLGV7bRzZ3YL4Ck0GqLdU+A@<wbr>mail.gmail.com</a>><br>
Content-Type: text/plain; charset=UTF-8<br>
<br>
Hi Wenda,<br>
<br>
pr_debug needs you to define the DEBUG macro to activate it.<br>
<br>
Check:<br>
<a href="http://stackoverflow.com/questions/28936199/pr-debug-not-giving-any-output" rel="noreferrer" target="_blank">http://stackoverflow.com/<wbr>questions/28936199/pr-debug-<wbr>not-giving-any-output</a><br>
<br>
and the kernel docs,<br>
<a href="https://www.kernel.org/doc/local/pr_debug.txt" rel="noreferrer" target="_blank">https://www.kernel.org/doc/<wbr>local/pr_debug.txt</a><br>
<br>
Joel<br>
<br>
On Mon, Oct 17, 2016 at 4:17 PM, Wenda Ni <<a href="mailto:wonda.ni@gmail.com">wonda.ni@gmail.com</a>> wrote:<br>
> Dear all,<br>
><br>
> I am working on a kernel module that incorporate both pr_debug and<br>
> pr_warn. I would like to see pr_debug messages from dmesg.<br>
><br>
> What I followed is to specify kernel parameter by saying "loglevel=7".<br>
> This can be seen confirmed from /proc/cmdline. But still, I donot get<br>
> pr_debug level messages either from dmesg or from /var/log/messages. I<br>
> also tried echo 7 > /proc/sys/kernel/printk. It does not return what I<br>
> expect, either.<br>
><br>
> Let me know what I am missing. Thank you very much in advance.<br>
><br>
> Cheers,<br>
><br>
> Wenda Ni, Ph.D.<br>
><br>
> ______________________________<wbr>_________________<br>
> Kernelnewbies mailing list<br>
> <a href="mailto:Kernelnewbies@kernelnewbies.org">Kernelnewbies@kernelnewbies.<wbr>org</a><br>
> <a href="https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies" rel="noreferrer" target="_blank">https://lists.kernelnewbies.<wbr>org/mailman/listinfo/<wbr>kernelnewbies</a><br>
<br>
<br>
<br>
------------------------------<br>
<br>
Message: 4<br>
Date: Tue, 18 Oct 2016 01:41:57 +0200<br>
From: Thibaut SAUTEREAU <<a href="mailto:thibaut.sautereau@telecom-sudparis.eu">thibaut.sautereau@telecom-<wbr>sudparis.eu</a>><br>
Subject: Re: kernel loglevel<br>
To: Wenda Ni <<a href="mailto:wonda.ni@gmail.com">wonda.ni@gmail.com</a>><br>
Cc: <a href="mailto:kernelnewbies@kernelnewbies.org">kernelnewbies@kernelnewbies.<wbr>org</a><br>
Message-ID: <<a href="mailto:20161017234156.GB1191@mines-telecom.fr">20161017234156.GB1191@mines-<wbr>telecom.fr</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
On Mon, Oct 17, 2016 at 07:17:32PM -0400, Wenda Ni wrote:<br>
> Dear all,<br>
><br>
> I am working on a kernel module that incorporate both pr_debug and<br>
> pr_warn. I would like to see pr_debug messages from dmesg.<br>
><br>
> What I followed is to specify kernel parameter by saying "loglevel=7".<br>
> This can be seen confirmed from /proc/cmdline. But still, I donot get<br>
> pr_debug level messages either from dmesg or from /var/log/messages. I<br>
> also tried echo 7 > /proc/sys/kernel/printk. It does not return what I<br>
> expect, either.<br>
><br>
> Let me know what I am missing. Thank you very much in advance.<br>
><br>
> Cheers,<br>
><br>
> Wenda Ni, Ph.D.<br>
><br>
> ______________________________<wbr>_________________<br>
> Kernelnewbies mailing list<br>
> <a href="mailto:Kernelnewbies@kernelnewbies.org">Kernelnewbies@kernelnewbies.<wbr>org</a><br>
> <a href="https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies" rel="noreferrer" target="_blank">https://lists.kernelnewbies.<wbr>org/mailman/listinfo/<wbr>kernelnewbies</a><br>
<br>
Hello Wenda,<br>
<br>
I encountered the same issue a while ago.<br>
As stated here: <a href="http://elinux.org/Debugging_by_printing" rel="noreferrer" target="_blank">http://elinux.org/Debugging_<wbr>by_printing</a><br>
pr_debug is replaced with an empty statement unless the kernel is compiled<br>
with DEBUG. So if you just want to play with printing kernel debug logs,<br>
just define the DEBUG macro in your module source file for testing.<br>
<br>
I also observed that without a new line character at the end of the string<br>
passed to pr_debug, I could not find the log line in dmesg output. Not sure<br>
where this comes from.<br>
<br>
--<br>
Thibaut SAUTEREAU<br>
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------------------------------<br>
<br>
Message: 5<br>
Date: Mon, 17 Oct 2016 20:29:33 -0400<br>
From: Wenda Ni <<a href="mailto:wonda.ni@gmail.com">wonda.ni@gmail.com</a>><br>
Subject: Re: kernel loglevel<br>
To: Joel Fernandes <<a href="mailto:agnel.joel@gmail.com">agnel.joel@gmail.com</a>><br>
Cc: "<a href="mailto:kernelnewbies@kernelnewbies.org">kernelnewbies@kernelnewbies.<wbr>org</a>"<br>
<<a href="mailto:kernelnewbies@kernelnewbies.org">kernelnewbies@kernelnewbies.<wbr>org</a>><br>
Message-ID:<br>
<<a href="mailto:CAEnvTt0BmAJ_nxf0oEUsFqqJjGssuXCQBg6pdt95Jk3PyBBQew@mail.gmail.com">CAEnvTt0BmAJ_<wbr>nxf0oEUsFqqJjGssuXCQBg6pdt95Jk<wbr>3PyBBQew@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Hi Joel,<br>
<br>
It works by specifying ccflags-y += -DDEBUG in the Makefile.<br>
<br>
Thank you for the info!!!!<br>
<br>
<br>
Cheers,<br>
<br>
Wenda Ni, Ph.D.<br>
<br>
<br>
On Mon, Oct 17, 2016 at 7:48 PM, Joel Fernandes <<a href="mailto:agnel.joel@gmail.com">agnel.joel@gmail.com</a>><br>
wrote:<br>
<br>
> Hi Wenda,<br>
><br>
> pr_debug needs you to define the DEBUG macro to activate it.<br>
><br>
> Check:<br>
> <a href="http://stackoverflow.com/questions/28936199/pr-debug-not-giving-any-output" rel="noreferrer" target="_blank">http://stackoverflow.com/<wbr>questions/28936199/pr-debug-<wbr>not-giving-any-output</a><br>
><br>
> and the kernel docs,<br>
> <a href="https://www.kernel.org/doc/local/pr_debug.txt" rel="noreferrer" target="_blank">https://www.kernel.org/doc/<wbr>local/pr_debug.txt</a><br>
><br>
> Joel<br>
><br>
> On Mon, Oct 17, 2016 at 4:17 PM, Wenda Ni <<a href="mailto:wonda.ni@gmail.com">wonda.ni@gmail.com</a>> wrote:<br>
> > Dear all,<br>
> ><br>
> > I am working on a kernel module that incorporate both pr_debug and<br>
> > pr_warn. I would like to see pr_debug messages from dmesg.<br>
> ><br>
> > What I followed is to specify kernel parameter by saying "loglevel=7".<br>
> > This can be seen confirmed from /proc/cmdline. But still, I donot get<br>
> > pr_debug level messages either from dmesg or from /var/log/messages. I<br>
> > also tried echo 7 > /proc/sys/kernel/printk. It does not return what I<br>
> > expect, either.<br>
> ><br>
> > Let me know what I am missing. Thank you very much in advance.<br>
> ><br>
> > Cheers,<br>
> ><br>
> > Wenda Ni, Ph.D.<br>
> ><br>
> > ______________________________<wbr>_________________<br>
> > Kernelnewbies mailing list<br>
> > <a href="mailto:Kernelnewbies@kernelnewbies.org">Kernelnewbies@kernelnewbies.<wbr>org</a><br>
> > <a href="https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies" rel="noreferrer" target="_blank">https://lists.kernelnewbies.<wbr>org/mailman/listinfo/<wbr>kernelnewbies</a><br>
><br>
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------------------------------<br>
<br>
Message: 6<br>
Date: Tue, 18 Oct 2016 14:11:41 +0000 (UTC)<br>
From: Amit Mahadik <<a href="mailto:amitmahadik35@yahoo.com">amitmahadik35@yahoo.com</a>><br>
Subject: Fw: TPS65910 Regulator Isuue<br>
To: Kernelnewbies <<a href="mailto:kernelnewbies@kernelnewbies.org">kernelnewbies@kernelnewbies.<wbr>org</a>><br>
Message-ID: <<a href="mailto:1865063607.2350837.1476799901899@mail.yahoo.com">1865063607.2350837.<wbr>1476799901899@mail.yahoo.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
<br>
<br>
<br>
Hi,? ? ?I am working on integrating TPS695190 regulator code into kernel version 4.4.16. The regulator powers MMC card slot using Designware MMC controller. I have declared the necessary code in my board.c file. The MMC card slot is powered by ldo8 supply declared as<br>
------------------------------<wbr>------------------------------<wbr>-----------------Code---------<wbr>------------------------------<wbr>------------------------------<wbr>------------<br>
<br>
static struct regulator_consumer_supply opv5xc_ldo8_supply[] = {<br>
??????? REGULATOR_SUPPLY("sd_vdd", NULL),<br>
};<br>
<br>
static struct regulator_init_data opv5xc_ldo8 = {<br>
??????? .constraints = {<br>
??????????????? .min_uV = 1000000,<br>
??????????????? .max_uV = 3300000,<br>
??????????????? .valid_ops_mask = (REGULATOR_CHANGE_VOLTAGE |<br>
??????????????????????????????<wbr>? REGULATOR_CHANGE_STATUS),<br>
??????????????? .boot_on = 1,<br>
??????? },<br>
??????? .num_consumer_supplies = ARRAY_SIZE(opv5xc_ldo8_supply)<wbr>,<br>
??????? .consumer_supplies = opv5xc_ldo8_supply,<br>
};<br>
static struct tps65910_board tps65910_pdata = {<br>
????? ??????? .tps65910_pmic_init_data[<wbr>TPS65911_REG_LDO8]???? = &opv5xc_ldo8,<br>
};<br>
static struct i2c_board_info __initdata opv5xc_i2c1_devs[] = {<br>
??????? {<br>
??????????????? I2C_BOARD_INFO ("tps65911", TPS65910_I2C_ID1),<br>
??????????????? .platform_data = &tps65910_pdata,<br>
??????? },<br>
};<br>
------------------------------<wbr>------------------------------<wbr>------------------------------<wbr>------------------------------<wbr>------------------------------<wbr>-----------------<br>
When I call regulator_get struct regulator *sd_vdd = regulator_get(NULL, "sd_vdd");? function from the Designware MMC driver code function the kernel panics.I have attached the log file for reference. Can somebody please let me know what I am doing wrong here?<br>
Regards,Amit.<br>
<br>
<br>
<br>
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</blockquote></div><br></div>