January 2013 - kernelnewbies@kernelnewbies.org

Re: /usr/ld Not enough room for program headers
by horseriver Jan. 9, 2013

Jan. 9, 2013

On Fri, Jan 04, 2013 at 11:34:24AM +0400, Игорь Пашев wrote: > 2013/1/4 horseriver <horserivers(a)gmail.com> > > > > Not enough room for program headers > > > Try to search the Web for this. E. g.: > http://lists.gnu.org/archive/html/bug-gnu-utils/2002-08/msg00176.html thanks! in my compile option. I have specifiedmy ld-script file ,and there is no SIZEOF_HEADER in that file , but where this error come from ?

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calling system call in arm from user space
by Niroj Pokhrel Jan. 9, 2013

Jan. 9, 2013

Hi, I have written a system call and build it with kernel for Arm architecture. However, I'm confused to use it to call it from the user space. As it is in x86, where we can simply call by using sycall() function and the return value is returned by the syscal() itself. In Arm, I tried to write an assembly language program and was able to call the system call using the assembly code but what I'm confused is how to call this function using C program. I tried using inline assembly but it didn't work. Further, if I can implement it using inline assembly then return value will be in r0 and how can I move this value to the user variable. Thanking you in advance. -- Niroj Pokhrel Software Engineer, Samsung India Software Operations

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netlink execution context
by Terry Hsu Jan. 8, 2013

Jan. 8, 2013

Hello guys, I have a question about the execution context of netlink. I am building a loadable kernel module in my kernel. I try to use it as a netlink server to receive the messages from user space. When the kernel module receives the message from user space and starts to process, is it living in its own context or it's actually borrowing the context of the current task? I want to access functions in user space when the netlink module receives the certain messages from user space. Is it possible to do so? Or it has to live in syscall context? such as using clone to define where the child process to start executing (function pointer as a parameter). Thanks in advance! Terry

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Locating the keyboard driver (and replacing it)
by manty kuma Jan. 8, 2013

Jan. 8, 2013

Hi, I have written a small module that toggles the capslock LED. To demonstrate it i want to replace the Existing keyboard module with mine. I tried lsmod|grep "key" without any success. also checked /proc/modules. I couldnot find any clue regarding the name of the module i need to uninstall. So, How can i remove the existing keyboard module and insert mine? Regards, Manty

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Need a tutorial about `write a simple file system` in linux
by Madper Jan. 8, 2013

Jan. 8, 2013

Hi all, Is there a good tutorial about how to write a simple file system? I know FUSE is easier. But I want to write a real filesystem based on disk. Any simple code example is ok. -- Thanks, Madper Xie.

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Re: Need a tutorial about `write a simple file system` in linux
by Madper Jan. 8, 2013

Jan. 8, 2013

On 01/08/2013 11:07 PM, Manish Katiyar wrote: > search google for "mkatiyar testfs" or "mkatiyar nngfs" > Hi, I'm reading your testfs. Thank you very very much! > On Tue, Jan 8, 2013 at 5:59 AM, Madper <bbboson(a)gmail.com > <mailto:bbboson@gmail.com>> wrote: > > Hi all, > Is there a good tutorial about how to write a simple file > system? > I know FUSE is easier. But I want to write a real filesystem > based > on disk. > Any simple code example is ok. > > -- > Thanks, > Madper Xie. > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies(a)kernelnewbies.org > <mailto:Kernelnewbies@kernelnewbies.org> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > > > -- > Thanks - > Manish

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doesn't support DPO or FUA
by Rahul Bedarkar Jan. 8, 2013

Jan. 8, 2013

Hi, When I attach pen-drive, I am seeing following logs. And when I remove pen-drive, file system does not unmount for 10-15 secs. [ 35.183406] usb 1-1: new full-speed USB device number 2 using dwc_otg [ 35.440812] usb 1-1: not running at top speed; connect to a high speed hub [ 35.456740] usb 1-1: New USB device found, idVendor=0781, idProduct=5572 [ 35.479144] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 35.501552] usb 1-1: Product: Cruzer Switch [ 35.513147] usb 1-1: Manufacturer: SanDisk [ 35.535614] usb 1-1: SerialNumber: 4C532000050910112450 [ 35.571416] scsi0 : usb-storage 1-1:1.0 [ 36.619687] scsi 0:0:0:0: Direct-Access SanDisk Cruzer Switch 1.20 PQ: 0 ANSI: 5 [ 36.651795] sd 0:0:0:0: [sda] 3908352 512-byte logical blocks: (2.00 GB/1.86 GiB) [ 36.682780] sd 0:0:0:0: [sda] Write Protect is off [ 36.709971] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 36.756973] sda: sda1 what is "doesn't support DPO or FUA" ? I am using Linux kernel 3.3.0. Thanks, Rahul B.

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SDHCI Driver Problem
by Nick Jan. 7, 2013

Jan. 7, 2013

All, I am currently working on a new freescale development board and am trying to get my SD card working. I am using the 3.0.34 kernel. I have modified my device tree settings and the sdhci-of file to match. However I am receiving the error " Controller never released inhibit bit(s)." when I attempt to mount the card though I can see it fine when I do an fdisk -l. Any of you guys with much mmc experience have any ideas? *fdisk -l output: * Disk /dev/mmcblk0: 7948 MB, 7948206080 bytes 4 heads, 16 sectors/track, 242560 cylinders Units = cylinders of 64 * 512 = 32768 bytes Device Boot Start End Blocks Id System /dev/mmcblk0p1 1 242560 7761912 b Win95 FAT32 *dmesg output:* * * mmc0: starting CMD18 arg 00000002 flags 000000b5 mmc0: blksz 512 blocks 2 flags 00000200 tsac 100 ms nsac 0 mmc0: CMD12 arg 00000000 flags 0000049d sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001 sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x0000000a sdhci [sdhci_data_irq()]: mmc0: DMA base 0x2f89e400, transferred 0x061c00 bytes, next 0x2f900000 sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001 mmc0: req done (CMD18): 0: 00000900 00000000 00000000 00000000 mmc0: 1024 bytes transferred: 0 mmc0: (CMD12): 0: 00000b00 00000000 00000000 00000000 mmc0: starting CMD18 arg 00000000 flags 000000b5 mmc0: blksz 512 blocks 8 flags 00000200 tsac 100 ms nsac 0 mmc0: CMD12 arg 00000000 flags 0000049d mmc0: Controller never released inhibit bit(s). sdhci: =========== REGISTER DUMP (mmc0)=========== sdhci: Sys addr: 0x2f900000 | Version: 0x00001301 sdhci: Blk size: 0x00000200 | Blk cnt: 0x00000000 sdhci: Argument: 0x00000000 | Trn mode: 0x00000033 sdhci: Present: 0xff8d000e | Host ctl: 0x00000032 sdhci: Power: 0x00000002 | Blk gap: 0x00000000 sdhci: Wake-up: 0x00000000 | Clock: 0x00000128 sdhci: Timeout: 0x0000000e | Int stat: 0x00000000 sdhci: Int enab: 0x027f000b | Sig enab: 0x027f000b sdhci: AC12 err: 0x00000000 | Slot int: 0x00001301 sdhci: Caps: 0x07fa0000 | Caps_1: 0x00100010 sdhci: Cmd: 0x00000c1b | Max curr: 0x00000000 sdhci: Host ctl2: 0x00000000 sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x08f0082c sdhci: =========================================== mmc0: req done (CMD18): -5: 00000000 00000000 00000000 00000000 mmc0: 0 bytes transferred: 0 mmc0: (CMD12): 0: 00000000 00000000 00000000 00000000 mmc0: starting CMD13 arg aaaa0000 flags 00000195 sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001 mmc0: req done (CMD13): 0: 00000900 00000000 00000000 00000000 mmcblk0: unknown error -5 sending read/write command, card status 0x900 end_request: I/O error, dev mmcblk0, sector 0 EXT2-fs (mmcblk0): error: couldn't readsuperblock on 2nd try mmc0: starting CMD17 arg 00000000 flags 000000b5 mmc0: blksz 512 blocks 1 flags 00000200 tsac 100 ms nsac 0 sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001 sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x0000000a sdhci [sdhci_data_irq()]: mmc0: DMA base 0x2f89e000, transferred 0x062000 bytes, next 0x2f900000 mmc0: req done (CMD17): 0: 00000900 00000000 00000000 00000000 mmc0: 512 bytes transferred: 0 mmc0: starting CMD17 arg 00000000 flags 000000b5 mmc0: blksz 512 blocks 1 flags 00000200 tsac 100 ms nsac 0 sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001 sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x0000000a sdhci [sdhci_data_irq()]: mmc0: DMA base 0x2f89e000, transferred 0x062000 bytes, next 0x2f900000 mmc0: req done (CMD17): 0: 00000900 00000000 00000000 00000000 mmc0: 512 bytes transferred: 0

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Detect list corruption at early stage to avoid BUG hitting?
by Ritesh Harjani Jan. 7, 2013

Jan. 7, 2013

Hi Everyone, Many times we see the following warning, which causes some kernel Bug to hit. I googled for any solution to detect list corruption so as to avoid the bug hit, but couldnt find any. Do you guys have any info ?? Does kernel provide any generic solution to do this? *Warning: list_del corruption. next->prev should be xxxxxx, but was yyyyy. * Regards Ritesh

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can i replace a .S file with .c file.
by SaNtosh kuLkarni Jan. 7, 2013

Jan. 7, 2013

Hi is it possible that the assembly code .S file in linux kernel be replaced by a .C file. -- *Regards, Santosh*

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