July 2015 - kernelnewbies@kernelnewbies.org - Kernelnewbies Mailing Lists

How to understand "processor" in "SMP" and "UP"?
by Nan Xiao July 21, 2015

July 21, 2015

Hi all, Per my understanding, the "processor" in "SMP" and "UP" should be a "logic CPU", not a "physical CPU". If the "physical CPU" contains 2 "cores", and every "core" contains 2 "hardware threads", then the "processor" should stands for "hardware thread". Is my understanding right? Thanks very much in advance! Best Regards Nan Xiao

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What can I do if I sent a wrong patch?
by Navy July 19, 2015

July 19, 2015

Hello, A mistake was found after I sent the patch to mentors. What Can I do to make up the fault?

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When to resend a patchset?
by Ricardo Ribalda Delgado July 19, 2015

July 19, 2015

Hello Usually I was taking the approach of pinging a patch after 21 days of inactivity. This has worked ok in the past, but the last time I have done it I was told that the merge window was open and that nothing could be done at that time. Is there a written guideline to know when to resend/ping a patch? How can I figure out the current development status of the kernel? Anything better than the lwn? I dont want to wast useful maintainer time :) Thanks! -- Ricardo Ribalda

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Re: goto???
by Sudip Mukherjee July 17, 2015

July 17, 2015

On Fri, Jul 17, 2015 at 2:52 PM, Martin Knappe <kohaerenzstifter(a)posteo.de> wrote: > I'm just messing ... > I guess I felt a bit challenged by your "try to write that without using > goto" Hey, it was not a challenge. main thing is the readability. But going by your general rules how will you modify this same function of dgap? I think I can get rid of multiple return only if i modify the code into a series of if - else . or anything simple? regards sudip

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dev_* mesage
by roni July 17, 2015

July 17, 2015

What is the difference between dev_* (like dev_err) and pr_* (like pr_err)? In which situations we use them?

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Re: goto???
by Sudip Mukherjee July 17, 2015

July 17, 2015

On Fri, Jul 17, 2015 at 2:18 PM, Martin Knappe <kohaerenzstifter(a)posteo.de> wrote: > Very easy: Looks good. :) But for me, now while reading the code I have to keep a note of the value of cleanupState variable and the error path becomes confusing. And besides in your opinion now which code is more readable, the original code or this one? regards sudip

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goto???
by Navy July 17, 2015

July 17, 2015

Hello, Goto is recommend in linux kernel programming, but it is despised in many other situation. There are four rationable for using goto in Documentation/CodingStyle. Do you have some viewpoints about "why goto" or "why not goto"? I'm glad to get your point. Thank you.

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Can I submit a patch?
by Navy July 16, 2015

July 16, 2015

Hi, I have done some cleanups in /drivers/staging/dgnc. I have compiled the driver and insmod/lsmod it. As I have no "dgnc" divice in my laptop, I don't kown whether it works well. Can I submit the patch? Thanks.

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Configuration settings for WM8850 wolfson audio codec
by bineet July 15, 2015

July 15, 2015

I need to check setting done for WM8850 wolfson audio codec chip. I tried browsing linux code, but couldn't find any clue. Could someone please help with the same? Thanks, Bineet

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Query on operstatus for link, can I change it?
by Amit Agarwal July 14, 2015

July 14, 2015

Hi, I am looking for a way to change the operstatus shown for the network interface. Problem: I have an extra interface on the machine that I would like to use for some program like tcpreplay and tcpdump/wireshark. So, I would like to play a pcap file on this interface and then capture on the same interface with wireshark. Now the problem with this is that unless a cable is plugged in I do not see any packets in wireshark, although I do not see any failures in sending the packets. I would like to do this without any cable being plugged in as I do not intend to send the packets out, is this possible? The reason I cannot use lo interface for doing this is: there will be other packets on the lo interface and I want to capture only the packets in the pcap file that I am playing with tcpreplay. Thanks in advance for any advice on this. -- Thanks, -aka

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