Re: Would like know when the tcp sequence no is rollover

[Bjørn Mork]

Ramana Reddy  writes:

> Hi all,
>
> I would like to know, when the TCP sequence no is rollover.
> Who will do it. Is it happens in tcp code or through the hardware.
> If is it is in the tcp code, can some one please point the code in the
> linux kernel
> where it happens.

Why this interest in TCP sequence numbers?

I believe RFC793 is a better source for understanding how this works:

  It is essential to remember that the actual sequence number space is
  finite, though very large.  This space ranges from 0 to 2**32 - 1.
  Since the space is finite, all arithmetic dealing with sequence
  numbers must be performed modulo 2**32.

Do you still think you'll find an explicit rollover code path? Why would
you write code like that?


Bjørn

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Would like know when the tcp sequence no is rollover

[Ramana Reddy]

Hi all,

I would like to know, when the TCP sequence no is rollover.
Who will do it. Is it happens in tcp code or through the hardware.
If is it is in the tcp code, can some one please point the code in the
linux kernel
where it happens.

Thanks & Regards,
Ramana
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Re: Wireless Driver issue (Atheros AR9485)

[Luis de Bethencourt]

On Thu, Sep 17, 2015 at 08:54:28AM -0400, David Scaperoth wrote:
> I'm attempting to run pm-suspend on my laptop (by shutting my lid and on
> command line), and its putting my AR9485 wifi card into a funk (i.e. wlan0
> interface seen through ifconfig never returns upon resume).
> 
> I know theres a lot to this (power management - pm-utils and kernel,
> wireless drivers, general linux drivers, and possibly other things), just
> need a little direction on which rabbit hole to start down...haha.
> 
> Ive looked through the ath9k and wireless list archives and had no luck
> finding the same issue.  I have tried different solutions (mostly related
> to pm-utils) from ubuntu's forums too.
> 
> an example of where it failed /var/log/pm-powersave.log
> 
>Running hook /usr/lib/pm-utils/power.d/wireless true:
> Turning powersave for wlan0 on...Error for wireless request "Set Power
> Management" (8B2C) :
> SET failed on device wlan0 ; Operation not supported.
> Failed.
> /usr/lib/pm-utils/power.d/wireless true: success.
> 
> 
> AND...according to
> https://wireless.wiki.kernel.org/en/users/documentation/dynamic-power-save
> I tried:
> iw dev wlan0 set power_save on
> command failed: Operation not supported (-95)
> 
> This is my first post to this list, so I'm not sure what information would
> be useful to help find a solution (or workaround).  Here goes nothing
> (perhaps I should attach text files next time for large diagnostic
> information?):
> 
> I built an upstream kernel against gregkh staging tree with a Ubuntu distro
> just to see if this would fix my issue and it did not.  Either way, here is
> some information:
> 
> >> uname -a
> Linux xxx 4.2.0+ #1 SMP Sun Sep 6 05:53:34 EDT 2015 x86_64 x86_64 x86_64
> GNU/Linux
> 
> >> lsb_release -a
> No LSB modules are available.
> Distributor ID:Ubuntu
> Description:Ubuntu 14.04.3 LTS
> Release:14.04
> Codename:trusty
> 
> cat /proc/version
> Linux version 4.2.0+ (gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04) ) #1
> SMP Sun Sep 6 05:53:34 EDT 2015
> 
> >>lspci -vvnn
> 
> 01:00.0 Network controller [0280]: Qualcomm Atheros AR9485 Wireless Network
> Adapter [168c:0032] (rev 01)
> Subsystem: Hewlett-Packard Company AR9485/HB125 802.11bgn 1??1 Wi-Fi
> Adapter [103c:1838]
> 
> 
> I could provide more information from lspci and lshw but I'm not sure what
> would help (if at all).  The strangest thing about the whole matter is that
> if I reboot, the card comes back online just fine.
> 
> Thanks again for any help you can provide!
> 
> David

Hi David,

I recommend you start with the support community of your distribution, which
in your case is Ubuntu.

https://help.ubuntu.com/community/WifiDocs/WirelessTroubleShootingGuide
That has a trouble shooting guide and a link to where to ask if the problem
persists.

Distribution communities are great to solve issues like this. The Kernel
Newbies mailing list focuses in people new to Linux Kernel development.

Hopefully your wifi works well soon :)
Luis

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Re: [PATCH 2662/2662] Staging: android: Fix 80 character length

[punit vara]

I have created one patch and already submitted. Now I have created
another patch for another directory . What should be the subject of
patch [Patch 2/2] or just [patch ] ???

On Fri, Sep 18, 2015 at 3:00 PM, punit vara  wrote:
> Thank you sir I will do the same If I would find any patch
>
> On Fri, Sep 18, 2015 at 2:45 PM, Sudip Mukherjee
>  wrote:
>> usually i will create the patch with git format-patch -1  to generate the
>> last patch
>>
>> On Fri, Sep 18, 2015 at 2:42 PM, punit vara  wrote:
>>>
>>> before changing the file I did git fetch and then git remote update
>>> .At that time all patches came automatically with update .Then I
>>> simply create patch with git format-patch master..my_local_branch
>>> 2662-...
>>>
>>> That is why subject was like [2662/2662] .
>>>
>>> On Fri, Sep 18, 2015 at 2:37 PM, Sudip Mukherjee
>>>  wrote:
>>> > I will also do git fetch but numbers will not show. what command you
>>> > gave to
>>> > generate the patch?
>>> >
>>> > On Fri, Sep 18, 2015 at 2:26 PM, punit vara  wrote:
>>> >>
>>> >> Sorry sir about that ..I have done git fetch so another 2661 patches
>>> >> fetched .that's why mistakenly it subject was like that.I again
>>> >> changed patch as you guide and send.Thank you for feedback sir
>>> >>
>>> >> On Fri, Sep 18, 2015 at 1:52 PM, Sudip Mukherjee
>>> >>  wrote:
>>> >> > On Fri, Sep 18, 2015 at 12:38:21PM +0530, Punit Vara wrote:
>>> >> >>   This patch is to the Kconfig file which fixes up lines which
>>> >> >>   exceeded the standard  80 character limitation.
>>> >> >>   This file also fixes up 3 warnings regarding paragraph.
>>> >> >>
>>> >> >> Signed-off-by: Punit Vara 
>>> >> >> ---
>>> >> > Your subject says 2662/2662. Then where are your 2661 earlier patches
>>> >> > of
>>> >> > the series?
>>> >> > No, that is wrong. The numbers we use when we submit a series of
>>> >> > patches. But for a single patch (1/1) numbers are not required and
>>> >> > 2662
>>> >> > is definitely wrong.
>>> >> >
>>> >> > regards
>>> >> > sudip
>>> >>
>>> >>
>>> >>
>>> >> --
>>> >> Regards,
>>> >> Punit Vara
>>> >> 9033553488
>>> >
>>> >
>>>
>>>
>>>
>>> --
>>> Regards,
>>> Punit Vara
>>> 9033553488
>>
>>
>
>
>
> --
> Regards,
> Punit Vara
> 9033553488



-- 
Regards,
Punit Vara
9033553488

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Re: [PATCH 2662/2662] Staging: android: Fix 80 character length

[Karthik Nayak]

On Fri, Sep 18, 2015 at 4:42 PM, punit vara  wrote:
> I have created one patch and already submitted. Now I have created
> another patch for another directory . What should be the subject of
> patch [Patch 2/2] or just [patch ] ???

If its different, keep it different ;)

-- 
Regards,
Karthik Nayak

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error when make pdfdocs

[慕冬亮]

I git clone and git pull the latest linux kernel.
When I make pdfdocs, it reports the following error to me.
But I checked the filesystems.xml:14946, no error found.

---
  PDF Documentation/DocBook/filesystems.pdf
Using catalogs: /etc/sgml/catalog
Using stylesheet: /usr/share/docbook-utils/docbook-utils.dsl#print
Working on: /home/mdl/Repos/linux/Documentation/DocBook/filesystems.xml
openjade:/home/mdl/Repos/linux/Documentation/DocBook/filesystems.xml:14946:16:E:
end tag for "variablelist" which is not finished
Documentation/DocBook/Makefile:131: recipe for target
'Documentation/DocBook/filesystems.pdf' failed
make[1]: *** [Documentation/DocBook/filesystems.pdf] Error 8
Makefile:1339: recipe for target 'pdfdocs' failed
---

- mudongliang

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Re: Preceding a method call with (void)

[Valdis . Kletnieks]

On Fri, 18 Sep 2015 17:04:03 +0300, Rami Rosen said:

> Well, there are rare cases in the kernel when you add (void) before calling
> the method. For example, if the method returns int or other type and you
> want to emphasize that you are aware of that and deliberately not check the
> return value.
> See for example:
> http://lxr.free-electrons.com/source/drivers/acpi/acpica/tbxfload.c#L156

The fact something is done in the tree doesn't mean it's *correct*.

If you check the tree, there are 80 instances of it being cast to (void),
and 9 instances of 'status ='.

Now if you go look at the source of the function in 
drivers/acpi/acpica/utmutex.c
we discover that there's 3 or 4 possible return(..) conditions in the
function (one only if _DEBUG is defined).  Looking at the places that
places that bother checking the return code, they all look something like this:

nsxfeval.c: status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
nsxfeval.c- if (ACPI_FAILURE(status)) {
nsxfeval.c- return (status);
nsxfeval.c- }

Now, given that 80 other sites don't bother checking, there's a good
chance that these 9 call sites shouldn't bother either, and the calling
code should be changed to not check the status either, and then make
the function definition a void.

(Of course a more careful examination of the code should be undertaken, but
it's more likely that there's 9 sites that are checking a return code that
doesn't actually matter than the chances that it really *does* matter in
9 places but not in 80 others...




pgpkz4LKB7Lx3.pgp
Description: PGP signature
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Re: Preceding a method call with (void)

[Rami Rosen]

Hi,
Well, there are rare cases in the kernel when you add (void) before calling
the method. For example, if the method returns int or other type and you
want to emphasize that you are aware of that and deliberately not check the
return value.
See for example:
http://lxr.free-electrons.com/source/drivers/acpi/acpica/tbxfload.c#L156

Regards,
Rami Rosen
בתאריך 10 בספט 2015 09:39,  כתב:

> On Thu, 10 Sep 2015 07:52:49 +0300, Kevin Wilson said:
>
> > (void) myFunc(param1);
> >
> > I did not encounter such cases in the kernel code that I read, thus far.
> >
> > On the other hand, I did not saw in the kernel coding style doc
> > anything which prohibits such usage.
> >
> > If I remember, using (void) before the method name is a way to tell
> > explicitly that this method does not return any value,
> > but I am not sure as for the exact reasons it is used (in userspace).
>
> Well, if the function actually returns nothing, in kernel code we usually
> declare it as:
>
> void myFunc( int param1)
> {
> /* yadda yadda yadda *.
> }
>
> Given that, what reason is there for casting the return value with (void)?
>
> (And if the function is actually   'int myFunc ( int param1) {...}',
> why are you calling it and then ignoring the return value?  That's a clue
> that you're abusing the API...)
>
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[no subject]

[Shraddha Barke]

By mistake I made some changes to staging-next branch
Now I've reverted those changes but I'm getting this message when I
checkout to staging-next

Your branch is ahead of 'origin/staging-next' by 4 commits.
  (use "git push" to publish your local commits)

How do I fix this?

Thanks in advance
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Re:

[Umair Khan]

You have made 4 commits on your local branch.
You need to remove them by git reset.
One way is to do git reset --hard origin/staging-next .
Note that this will revert all the changes made by you.

On Fri, Sep 18, 2015, 10:53 PM Shraddha Barke 
wrote:

> By mistake I made some changes to staging-next branch
> Now I've reverted those changes but I'm getting this message when I
> checkout to staging-next
>
> Your branch is ahead of 'origin/staging-next' by 4 commits.
>   (use "git push" to publish your local commits)
>
> How do I fix this?
>
> Thanks in advance
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Re:

[Shraddha Barke]

On Fri, Sep 18, 2015 at 10:58 PM, Umair Khan  wrote:

> You have made 4 commits on your local branch.
> You need to remove them by git reset.
> One way is to do git reset --hard origin/staging-next .
> Note that this will revert all the changes made by you.
>
> Yes. Thanks a lot :)


> On Fri, Sep 18, 2015, 10:53 PM Shraddha Barke 
> wrote:
>
>> By mistake I made some changes to staging-next branch
>> Now I've reverted those changes but I'm getting this message when I
>> checkout to staging-next
>>
>> Your branch is ahead of 'origin/staging-next' by 4 commits.
>>   (use "git push" to publish your local commits)
>>
>> How do I fix this?
>>
>> Thanks in advance
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>>
>
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