January 2013 - kernelnewbies@kernelnewbies.org

what is SYSCALL in arch/i386/kernel/Makefile
by horseriver Jan. 6, 2013

Jan. 6, 2013

hi: In arch/i386/kernel/Makefile , there is a SYSCALL , what is it ? thank!

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subscription
by 谢逸凡 Jan. 6, 2013

Jan. 6, 2013

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keyboard driver question
by Racz Zoli Jan. 5, 2013

Jan. 5, 2013

Hi. I`m sorry if this isn`t the right place to post my question, but first I tried posting it on forum.kernelnewbies.org and nobody answered. Here`s my question: I have a Gembird kb-9140l keyboard with some multimedia keys which are not working on linux. I thought about writing my own driver for it, so as a start, I wrote a small module, which registers an interrupt handler on irq 1 with the IRQF_SHARED flag. In the handler function I put a simple printk with the scancode read from the keyboard. The problem is, that the handler never gets executed. I searched on google, and found that because the native driver doesn`t share its interrupt with another modules, before I call request_irq I have to free the original interrupt handler from the native driver. This would make my computer practically unusable until I reboot, but at least I would see, it works, but it doesn`t. The original driver works fine after I insert my module, and the interrupt handler still doesn`t get called. The weird thing is, when I remove my module, my handler executes ones, and the scancode is 0xFE. The code is the following: #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/interrupt.h> #include <asm/io.h> MODULE_LICENSE("Dual BSD/GPL"); static int gembirdkb_init(void); static void gembirdkb_exit(void); irq_handler_t irq_handler (int irq, void *dev_id, struct pt_regs *regs) { static unsigned char scancode; scancode = inb (0x60); printk("gembirdkb: irq handled... scancode: %d\n",scancode); return (irq_handler_t) IRQ_HANDLED; } static int gembirdkb_init(void) { int ret; /* free original interrupt handler */ // free_irq(1, NULL); ret = request_irq (1, (irq_handler_t) irq_handler, IRQF_SHARED, "gembirdkb", (void *)&irq_handler); printk("gembirdkb: request_irq result: %d\n", ret); return ret; } static void gembirdkb_exit(void) { free_irq(1, (void *)&irq_handler); } module_init(gembirdkb_init); module_exit(gembirdkb_exit); Is there any way I can remove the native driver, or I need to recompile the kernel without it, and insert mine? P.s.: Why every topic on the forum is full with questions about mac, iphone, samsung galaxy etc.?

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trace MKFS
by KASHISH BHATIA Jan. 5, 2013

Jan. 5, 2013

Hi, I want to trace the overall flow of mkfs inside linux kernel. Specifically want to know which kernel fs data structures are affected when we run "mkfs" ? What all "mkfs" command writes on the block device when we run the command? Are there any good documents which can explain the same? -- Regards, Kashish Bhatia

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question about compilation in directory linux-2.6.0\arch\i386\kernel
by horseriver Jan. 4, 2013

Jan. 4, 2013

hi: in the makefile ,I can not find link options for vsyscall-int80.so, I want to add a option for ld how can I do this ? thank!

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what is SYSCALL in kernel makefile
by horseriver Jan. 4, 2013

Jan. 4, 2013

hi: In arch/i386/kernel/Mkaefile : quiet_cmd_syscall = SYSCALL $@ what does this mean ? I can not fins SYSCALL's definition any advice is appreciate! thanks!

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IOCTL number differs from kernel space
by Jeshwanth Kumar N K Jeshu Jan. 3, 2013

Jan. 3, 2013

Hello All, I am trying IOCTL example provided in http://linux.die.net/lkmpg/x892.html, both user-space and kernel space using same chardev.h file for IOCTL number. But the number receiving in kernel is different than number in kernel. I printed both the received number and defined number in dmesg, please find it below. // IOCTL number which is in kernel [ 6417.807403] Value of IOCTL_GET_NTH_BYTE: -1073454078 [ 6417.807398] Value of IOCTL_GET_MSG: -2147195903 [ 6417.807391] Value of IOCTL_SET_MSG: -2147195904 // IOCTL number which is received by kernel. [ 6426.691360] Passed IOCTL:number 0 [ 6426.691464] Passed IOCTL:number -1074930088 [ 6426.691537] Passed IOCTL:number 134514878 Can you please tell why this number is getting changed while receiving in kernel ? // Here is the definition of numbers. #define MAJOR_NUM 100 #define IOCTL_SET_MSG _IOR(MAJOR_NUM, 0, char *) #define IOCTL_GET_MSG _IOR(MAJOR_NUM, 1, char *) #define IOCTL_GET_NTH_BYTE _IOWR(MAJOR_NUM, 2, int) -- Regards Jeshwanth Kumar N K +91-7411483498

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Re: Kernelnewbies Digest, Vol 26, Issue 1
by Ganesh B Jan. 3, 2013

Jan. 3, 2013

I am trying to build the Kernel 3.7 and there are some files which have to be overwritten when uncompressing. One of the same files, ipt_ECN.c, gives an error stopping the build process. Any suggestions? net/ipv4/netfilter/ipt_ECN.c:20:42: fatal error: linux/netfilter_ipv4/ipt_ECN.h: No such file or directory compilation terminated. make[3]: *** [net/ipv4/netfilter/ipt_ECN.o] Error 1 make[2]: *** [net/ipv4/netfilter] Error 2 make[1]: *** [net/ipv4] Error 2 make: *** [net] Error 2 TnR, Ganesh B ________________________________ From: "kernelnewbies-request(a)kernelnewbies.org" <kernelnewbies-request(a)kernelnewbies.org> To: kernelnewbies(a)kernelnewbies.org Sent: Wednesday, January 2, 2013 10:30 PM Subject: Kernelnewbies Digest, Vol 26, Issue 1 Send Kernelnewbies mailing list submissions to kernelnewbies(a)kernelnewbies.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies or, via email, send a message with subject or body 'help' to kernelnewbies-request(a)kernelnewbies.org You can reach the person managing the list at kernelnewbies-owner(a)kernelnewbies.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Kernelnewbies digest..." Today's Topics: 1. Re: trace_console function definition not found in Linux kernel v3.5 (jiangtao.jit) 2. compile linux kernel 2.6.0 failed! (horse_rivers) ---------------------------------------------------------------------- Message: 1 Date: Wed, 02 Jan 2013 11:45:38 +0800 From: "jiangtao.jit" <jiangtao.jit(a)gmail.com> Subject: Re: trace_console function definition not found in Linux kernel v3.5 To: "siddharth goel" <siddharth98391(a)gmail.com> Cc: kernelnewbies <kernelnewbies(a)kernelnewbies.org> Message-ID: <50e3ad65.8abe440a.56a1.ffffbc73(a)mx.google.com> Content-Type: text/plain; charset="utf-8" siddharth goel: defined in include/trace/event/printk.h refer to macro TRACE_EVENT_CONDITION(...) 2013-01-02 jiangtao.jit ????siddharth goel ?????2012-12-28 15:43 ???trace_console function definition not found in Linux kernel v3.5 ????"kernelnewbies"<kernelnewbies(a)kernelnewbies.org> ??? In file kernel/printk.c in Linux Kernel 3.5 there is a function call trace_console(text, 0, len, len); @line 1219 . But I could not find the definition for same. Am I missing any concept ? -- Thanks and Regards, Siddharth Goel

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compile linux kernel 2.6.0 failed
by horseriver Jan. 3, 2013

Jan. 3, 2013

hi: I am compiling 2.6.0 kernel with gcc 4.4.5 and link with ld 2.20 version. my host os is 2.6.32 kernel . when linking .so , output this error : /usr/bin/ld: arch/i386/kernel/vsyscall-int80.so: Not enough room for program headers, try linking with -N does gcc generate the program headers ? why not enough room for it ? I guess it is because gcc version is not compitable with ld version is there some advice ? thanks!

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compile linux kernel 2.6.0 failed!
by horse_rivers Jan. 2, 2013

Jan. 2, 2013

hi, I am compiling kernel 2.6.0 with gcc 4.4.5, when linking , here comes the error : /usr/bin/ld: arch/i386/kernel/vsyscall-int80.so: Not enough room for program headers, try linking with -N I suspect that gcc version is not compitable for ld , my ld is 2.20 version . I want to know what does this error mean ? and the general reason for this ? thanks!

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