- kernelnewbies@kernelnewbies.org - Kernelnewbies Mailing Lists

Re: Need help: How to set .RECIPEPREFIX variable to whitespaces
by amit mehta July 25, 2011

July 25, 2011

Asked 'Make' gurus today about this and here's what Paul D. Smith confirmed: "RECIPEPREFIX must be set to exactly one unique character. There's no way to set it to be "four spaces". Also note that this feature is only available in the latest version of GNU make and many systems do not include that version yet, so if you use this feature your makefiles will not be portable to older systems (you might not care about that). " - Amit On Mon, Jul 18, 2011 at 10:40 AM, amit mehta <gmate.amit(a)gmail.com> wrote: > Thank you. With your work around I do not need to edit my vimrc file > everytime i need to write a Makefile. > > -Amit > > On Wed, Jul 13, 2011 at 8:03 PM, DG <dangets(a)gmail.com> wrote: >> On Wed, Jul 13, 2011 at 1:52 AM, amit mehta <gmate.amit(a)gmail.com> wrote: >>> Hi, >>> >>> How to set .RECIPEPREFIX variable to whitespace(say 4 whitespces) , so that >>> make uses this particular set of characters to identify the recipe for >>> a particular target. >>> In my $HOME/.vimrc file, for code indentation purpose, I've put the >>> following entries >>> to replace tabs with 4 whitespaces: >>> >>> <<<snip from my $HOME/.vimrc file>>> >>> "replace tabs with spaces >>> set expandtab >>> set shiftwidth=4 >>> set tabstop=4 >>> <<<snip from my $HOME/.vimrc file>>> >>> >>> >>> but the above will cause problem in case you write your own makefile >>> for a kernel module, >>> because now the tab stroke will be replaced by 4 whitespaces which >>> 'make' will not understand. >>> Quoting from 'make' manual, >>> "Please note: you need to put a tab character at the beginning of >>> every recipe line!" >>> >>> Seems .RECIPEPREFIX will come for resuce, but as of now I don't know >>> how to use it >>> to fix my problem. >>> >>> Regards, >>> Amit >>> >>> -- >>> Life is elsewhere. Cross Frontiers. Fly away. >>> >>> - Salman Rushdie >>> >>> _______________________________________________ >>> Kernelnewbies mailing list >>> Kernelnewbies(a)kernelnewbies.org >>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >>> >> >> I have my vimrc file setup to use different tabs/spacing depending on >> the filetype. 8-width tab in C, 4-space indent in Python, etc... >> >> Here's a snippet from my vimrc: >> >> "-------- C ------------------------- >> function! LANG_C() >> setlocal noexpandtab >> setlocal shiftwidth=8 >> setlocal tabstop=8 >> setlocal softtabstop=8 >> setlocal formatoptions=tcroq >> endfunction >> autocmd FileType c call LANG_C() >> >> "------- Python ---------------- >> function! LANG_PYTHON() >> setlocal shiftwidth=4 >> setlocal tabstop=4 >> setlocal softtabstop=4 >> setlocal expandtab >> "--- python indent keywords -------- >> setlocal cinwords=if,elif,else,for,while,try,except,finally,def,class,with >> endfunction >> autocmd FileType python call LANG_PYTHON() >> >> "------- Makefile -------------- >> function! LANG_MAKEFILE() >> setlocal noexpandtab " makefiles only work with tab-indents >> setlocal shiftwidth=8 >> setlocal tabstop=8 >> setlocal softtabstop=8 >> endfunction >> autocmd FileType make call LANG_MAKEFILE() >> >> >> There may be other/better ways to do this, but it works well for me. >> > > > > -- > Life is elsewhere. Cross Frontiers. Fly away. > > - Salman Rushdie > -- Life is elsewhere. Cross Frontiers. Fly away. - Salman Rushdie

1 0

problem with queue numbers between bridge, bonding and lo devices
by jiangtao.jit July 25, 2011

July 25, 2011

Hi, all recently, i read some of the Kernel codes and i noticed that a bridge and lo device have only one queue when allocated but a bonding device can have multi queues they are all virtual devices why they can have diffrent queue numbers it confused me a lot i would really appreciate if someone could give me some guidelines thanks very much 2011-07-16 jiangtao.jit

2 4

setitimer shows different between amd64 and ia32
by Adam Lee July 25, 2011

July 25, 2011

Hi, all I'm working on a test which invoking setitimer(), and it hang in ia32 and ppc, but passed in amd64, could you guys give some help? 1, I know the 'value.it_interval.tv_usec' is too short, but why amd64 passed? 2, If I switch clock source from "tsc" to "hpet" on ia32, it passed. 3, I compiled it in ia32 and run it with ia32-libs in amd64, it passed. Here is the source: #include <sys/time.h> #include <signal.h> #include <unistd.h> #include <stdio.h> #include <time.h> #include <errno.h> #define LOOP_LIMIT 1E2 volatile int sigcount = 0; void catcher(int sig) { struct itimerval value; int which = ITIMER_REAL; sigcount++; if (sigcount > 1) { getitimer(which, &value); value.it_value.tv_sec = 0; value.it_value.tv_usec = 0; /*setitimer( which, &value, NULL ); */ } } int main(int argc, char *argv[]) { int result = 0; struct itimerval value, ovalue, pvalue; int which = ITIMER_REAL; struct sigaction sact; volatile double count; time_t t; sigemptyset(&sact.sa_mask); sact.sa_flags = 0; sact.sa_handler = catcher; sigaction(SIGALRM, &sact, NULL); getitimer(which, &pvalue); /*Set a real time interval timer to repeat */ value.it_interval.tv_sec = 0; value.it_interval.tv_usec = 1; value.it_value.tv_sec = 0; value.it_value.tv_usec = 5; result = setitimer(which, &value, &ovalue); /*The interval timer value returned by setitimer() should be */ /*identical to the timer value returned by getitimer() */ if (ovalue.it_interval.tv_sec != pvalue.it_interval.tv_sec || ovalue.it_interval.tv_usec != pvalue.it_interval.tv_usec || ovalue.it_value.tv_sec != pvalue.it_value.tv_sec || ovalue.it_value.tv_usec != pvalue.it_value.tv_usec) { printf("Real time interval timer mismatch, test Failed\n"); result = -1; } time(&t); printf("Before loop, time is %s", ctime(&t)); for (count = 0; ((count < LOOP_LIMIT)); count++) ; time(&t); printf("After loop, time is %s\n", ctime(&t)); if (sigcount == 0) printf("The signal catcher never gained control\n"); else printf("The signal catcher gained control\n"); printf("The value of count is %.0f\n", count); return (result); } -- Regards, Adam Lee -------------------------------------------------- E-mail: adam8157(a)gmail.com Website: http://www.adam8157.info --------------------------------------------------

3 3

regarding do_IRQ()
by santhosh kumars July 25, 2011

July 25, 2011

Hi I am reading robertlove implementing interrupt handlers. When interrupt comes, the processor immediately stops what it is doing, disables the interrupt system (I am assuming disables all local interrupts of that processor)and jumps to the initial entry point where it calls do_IRQ(). do_IRQ() acknowledges the receipt of the interrupt and disables the interrupt delivery on the line. Here is my question like ,If do_IRQ() disables the interrupt delivery on the line(I am assuming it disables the interrupt delivery to all other processors on that line),then what about the other devices which are sharing same interrupt line and trying to send interrupts to processors. thanks, santhu.

2 1

"echo c > /proc/sysrq-trigger" is hung in fedora14 guest os.
by Sudhakar Jha July 24, 2011

July 24, 2011

Hi, I am running Fedora14 in "Virtualbox 4.0.8". The host OS is Windows-XP. I configured kdump, kexec & crash as per instruction in Fedora-14-Deployment_Guide. The system gets hung and crash file is not generated after running the command "echo c > /proc/sysrq-trigger". ------------------------------------------------------ $ uname -a Linux fc14 2.6.35.6-45.fc14.i686 #1 SMP Mon Oct 18 23:56:17 UTC 2010 i686 i686 i386 $ service kdump status Kdump is operational $ su -c 'echo 1 > /proc/sys/kernel/sysrq' Password: $ su -c 'echo c > /proc/sysrq-trigger' Password: ------------------------------------------------------ Regards, Sudhakar.

1 0

git format-patch: skipping interim commits.
by Ali Bahar July 24, 2011

July 24, 2011

Hi all, (yes, I _am_ aware that there is a separate git mailing list. This seemed to be more apt for _here_, as a first attempt.) When I run 'git format-patch' to prepare a submission, it creates a patch-file for every commit. While this is sometimes fine, it often isn't: I want it to skip all the interim commits which I did during development. There is no point in (and likely prosecutable in several jurisdictions) submitting the interim miscellany, thereby creating needless, non-Acked, log entries in master. I do have a crude work-around for this, but I prefer to find out how everyone else tackles this. I expect that it is more a _workflow_ issue than having to do with specifying revision ranges on the command-line. thanks, ali PS the crude work-around is to copy all the changes into a clean branch, and do a single commit. But that's error-prone when you have numerous files, and several sets of commits. PPS A simplified example, given a Master and a Dev branch: 1. Dev has lots of interim commits, for a single, logically-cohesive change. Once the work is complete, I want to create a single patch file for the entire delta against Master. 2. Dev will next have another set of commits. These are logically related and, once done, are to result in another single patch file. 3. and so on. This is all subject to Release Early, Release Often, so I am not talking about sitting on a bunch of changes for too long!

2 2

Memory change notifications
by Erlon Cruz July 24, 2011

July 24, 2011

Hi all, I have a device driver that implements a mmap in a char device. I would like to know if is possible to get notified(in that kernel module) every time a process change its mapped memory. Does anyone know if so? Regards, Erlon

5 5

How to recognize synchronous write requests
by Amirali Shambayati July 23, 2011

July 23, 2011

Hi all, As much as I know, type of an IO request can be realized by "DATA_DIR" macro,but I wanted to know if it is possible to distinguish a read or write is synchronous or asychronous. I'm also using "blktrace" to extract requests dispatching to disk. blktrace, determines synchrnous writes as "ws" and asynchronous writes as "w". Regards, -- Amirali Shambayati Bachelor Student Computer Engineering Department Sharif University of Technology Tehran, Iran

2 1

Problem installing vanilla kernel on Fedora 13
by Vaibhav Jain July 23, 2011

July 23, 2011

Hi, I am trying to install an extra vanilla kernel on Fedora 13. The Fedora 13 runs on vmware virtual machine. I installed it using and iso of live cd. A 'uname -r' gives the version as 2.6.33-85.fc13.i686. The kernel version I am trying to install is 2.6.38.8 I am following these steps : - Download kernel source and unzip it - make menuconfig (Saved the config) - make - make modules_install - make install However as soon as i do a 'make install ' an error message appears saying : "ERROR:modinfo:could not find module i2c_core" I could find the options for i2c in the config menu and enabled some of them but didn't help. Could anyone please tell me how to debug this error ? I have tried the same thing on Fedora 14 earlier and there was no such problem. Thanks Vaibhav Jain

2 2

GPIO acces on x86
by Victor Rodriguez July 23, 2011

July 23, 2011

Hi I want to access to the GPIO on a Intel Atom N450. I have already read the kernel GPIO documentation http://www.mjmwired.net/kernel/Documentation/gpio.txt And by sysfs (/sys/class/gpio) echo 19 > export shows me an error of permisions Do i have to recompile the kernel like with this instructions ? http://elinux.org/GPIO I really would prefer to make a char driver , I already have one for OMAP technology, on that case in order to access to gpio is necessary to do this : #define PIN_LED GPIO_TO_PIN(6, 12) #define MUX_LED DA850_GPIO6_12 /*Free gpio */ gpio_free(PIN_LED); /*Configure in mux.h */ ret = davinci_cfg_reg (MUX_LED); if (ret<0) { return ret; } /*Ask permision to turn it on */ ret = gpio_request(PIN_LED, "led"); if (ret) { return ret; } /*Configure as out put */ gpio_direction_output(PIN_LED, 1); /*TURN ON */ gpio_set_value(PIN_LED, 1); But how can I do the GPIO_TO_PIN(6, 12) on Atom technology ? Thanks a lot for your help Regards Sincerely yours Victor Rodriguez

1 0