August 2015 - kernelnewbies@kernelnewbies.org

Re: Make sure the searching header file path when building Linux kernel
by Nan Xiao Aug. 6, 2015

Aug. 6, 2015

"gcc -xc -E -v -" can show the include search paths. Best Regards Nan Xiao On Wed, Aug 5, 2015 at 6:34 PM, Abhilash Mhaisne <abhilashmhaisne(a)gmail.com> wrote: > By default gcc does search under /usr/include. I am not sure about > /usr/local/include though. > If header files at the top are #included as > "your_build_direc/include/some_header_file.h" then gcc will look into that > path. > Otherwise if it is #include <some_header_file.h> , it will search under > /usr/include and anything that is under C_INCLUDE_PATH variable. See man > page of gcc for more. > > Regards, > Abhilash Mhaisne > > On Wed, Aug 5, 2015 at 3:13 PM, Nan Xiao <xiaonan830818(a)gmail.com> wrote: > >> Hi all, >> >> I want to make sure the searching header file path when building Linux >> kernel: >> Per my understanding, the gcc only find header files in current building >> linux >> directory: include/*, won't search system header file path: such as >> /usr/inclue, >> /usr/local/include, etc. >> >> Is my understanding right? Thanks very much in advance! >> >> Best Regards >> Nan Xiao >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies(a)kernelnewbies.org >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> >> >

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Requirement to customize Linux Network Interface naming Convention
by Akash Bhatnagar Aug. 5, 2015

Aug. 5, 2015

Hi, We have a requirement to tweak the Linux Network Interface Naming conventions so that, it can support names of interfaces with "/" character. For example, ip tuntap add dev fe/1/1 mode tap With iproute2 it simply shows error as INVALID Argument. What are the changes we supposed to do inside Kernel and iproute2 package? Thanks Akash Bhatnagar

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Make sure the searching header file path when building Linux kernel
by Nan Xiao Aug. 5, 2015

Aug. 5, 2015

Hi all, I want to make sure the searching header file path when building Linux kernel: Per my understanding, the gcc only find header files in current building linux directory: include/*, won't search system header file path: such as /usr/inclue, /usr/local/include, etc. Is my understanding right? Thanks very much in advance! Best Regards Nan Xiao

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debugging kernel module __init function?
by Nicholas Murphy Aug. 5, 2015

Aug. 5, 2015

I can’t for the life of me figure out how to set a breakpoint on a kernel module’s __init function. Everything I’ve read talks about using add-symbol-file with the values for .text, .bss, and .data after the module is loaded, a la: https://www.linux.com/learn/linux-training/33991-the-kernel-newbie-corner-k… How do I debug the __init function (that is called on module load)? Thanks, Nick

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Where does the linux kernel put local variables
by Rock Lee Aug. 4, 2015

Aug. 4, 2015

Hi, all: I print a local variable address in start_kernel(), and I realize this address is between __data_start and _edata. In my opinion, local variables should be located in stack, why is this local variable located in data section? BTW, I use a arm11 board with linux-2.6.28. Thanks -- Rock Lee

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Is there any tool can format source code according to kernel coding rule?
by Nan Xiao Aug. 3, 2015

Aug. 3, 2015

Hi all, I am just wondering whether there is a script/tool which format source code according to kernel coding rule automatically? Such as tab, space, brace, etc. Thanks very much in advance! Best Regards Nan Xiao

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can't create lttng-modules
by Jacob Gonik Aug. 3, 2015

Aug. 3, 2015

Hi, In my work, i need to "install" lttng tracer to an embedded linux platform, with arm7 processor. I use bitbake files from an open embedded project. For the first time, i activated : # bitbake -c compile lttng-modules , and it fetches the source code. But when i make an entire project build, i have no "module" product file: "lttng-modules.ko" or any "lttng*.ko" file. The bb file i use is : lttng-modules_2.0.pre11.bb https://github.com/dlespiau/poky/blob/master/meta/recipes-kernel/lttng-2.0/… I would like to have a clue or direction to solve this. Regards Kobi

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How can I locate a struct's defination?
by Navy Cheng Aug. 3, 2015

Aug. 3, 2015

Hi, I use emacs and tags to read kernel source. The tags is create by make tags in the kernel source tree. When I want to find a struct's defination, something goes wrong. For example: when I find *dentry* , the first result is: struct rchan_buf { ... struct dentry *dentry; /* channel file dentry */ ... } There are so many items like this before I find struct dentry { .... } How can I find the struct's defination directly? Thanks.

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Re: Is there any tool can format source code according to kernel coding rule?
by Rameshbabu Aug. 3, 2015

Aug. 3, 2015

Hi , There is a script in kernel source tree which used to check the code is in the proper coding style. But I don't about automatically changing code to specific coding style. The script name called checkpatch.pl present in kernel tree scripts/ directory. If you want to use this script. Make it as executable, by giving chmod +x checkpatch.pl ./checkpatch.pl --no-tree -f <file_name> This will tell you what are all the coding style you have missed. So you can format your code to coding style easily. Thanks, Ramesh From: "Aruna Hewapathirane" <aruna.hewapathirane(a)gmail.com> To: "Nan Xiao" <xiaonan830818(a)gmail.com> Cc: "kernelnewbies" <kernelnewbies(a)kernelnewbies.org> Sent: Monday, August 3, 2015 10:30:47 AM Subject: Re: Is there any tool can format source code according to kernel coding rule? > Hi all, > > I am just wondering whether there is a script/tool which format source code > according to kernel coding rule automatically? Such as tab, space, brace, > etc. > > Thanks very much in advance! > > Best Regards > Nan Xiao If your using vi(m) in command mode type gg=G this will indent your code . if your want kernel coding rules compatibility run your code through scripts/Lindent. There is a vim plugi-in http://www.vim.org/scripts/script.php?script_id=4369 will do the same. _______________________________________________ Kernelnewbies mailing list Kernelnewbies(a)kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

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Fwd: USB Driver - Device No Response standard compliant
by Christian N Aug. 3, 2015

Aug. 3, 2015

Hi All According to USB On The Go and Embedded Host Automated Compliacne Plan, item 6.7.22 A-UUT “Device No Response” for connection timeout, the "Device not responding” error message should be displayed when a non-responsive device is attached. I know that the presentation of the message is the responsibility of the application (user space), but to do this is necesary an event from usb driver (I think it). Nowdays when a non responsive device is attached, "unable to enumerate USB device on port... " is logged a in dmesg, but not event is dispatched (by example in usb_uevent). Without an event application should poll the log (loading the system unnecessarily) searching new "not responsive devices". To comply with the standard usb driver should be modified? I'm probably confusing responsibilities of user and kernel space. I appreciate your opinion/answer. Thanks in advance Christian

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