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

Test
by Mohit . July 5, 2015

July 5, 2015

Test mail

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Changel anguage
by Gnoleba GNOGBO July 4, 2015

July 4, 2015

Hi ! I would like to change my language to french please. Best regards Gnoleba

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HELP All USEFULL LINK
by Gnoleba GNOGBO July 3, 2015

July 3, 2015

Hi All ! Please help me. Can you give me the all usefull link to understand how the kernel works. I am 62. I would like to be evangilist of linux in Africa. I have no money to buy books or courses. Thanks for your help. GNOGBO

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Unit in which generic_buffer.c application gives data for sensors.
by s.rawat July 2, 2015

July 2, 2015

Hi, What are the unit in which the generic_buffer.c application gives the accelerometer , Gyro and Magnetometer values. Thanks in advance ! Rgd, S

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Linux's MMC driver and SDCard life time doubt
by Daniel. July 2, 2015

July 2, 2015

Hi for all, I have an application running on top of an sd card formated with vfat. This application is Java and uses ActiveMQ on same vfat sdcard filesystem, the ActiveMQ generates a huge I/O on sdcard. I know that SDCards sectors have an specific writing limits. I want to know if Linux's mmc driver would spare the writes across whole SDCard improving its life time or if this role is to be played by filesystem? The SDCards live about 15 days before crashing, after crashing I can't format it again, I have no idea about tools for getting a status of SD remaing life time, any pointing would be helpful! Thanks in advance! -- *"Do or do not. There is no try"* *Yoda Master*

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working with linux-next ... must tags be fetched separately?
by Robert P. J. Day July 1, 2015

July 1, 2015

perusing the current instructions on how to work with linux-next here: https://www.kernel.org/doc/man-pages/linux-next.html and i'm puzzled by this part of the instructions: Fetch linux-next plus tags $ git fetch linux-next ... $ git fetch --tags linux-next ... is it really necessary to run two separate fetch commands? from the man page for git-fetch, one reads: -t, --tags Fetch all tags from the remote (i.e., fetch remote tags refs/tags/* into local tags with the same name), in addition to whatever else would otherwise be fetched. so would it not be sufficient to run simply: $ git fetch --tags linux-next or am i misreading something? rday -- ======================================================================== Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================

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All links for a dummy
by Gnoleba GNOGBO July 1, 2015

July 1, 2015

Hi All ! Step by step I would like to understand how work the linux kernel help me please and give me all useful link. I shall work hard but I ' ll become evangelist for linux ! Help me please. I am sixty two, I have no money to buy courses or books. Thanks Gnoleba

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CONFIG_PREEMPT_NONE and interrupts
by Sudharsan Vijayaraghavan July 1, 2015

July 1, 2015

HI All, Please validate my understanding regarding the following, While CONFIG_PREEMPT_NONE is set 1 and a process is already in kernel mode, interrupts to that core will not honored until it exits from kernel mode, Thanks, Sudharsan

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Divide Error: 0000 [#1] SMP
by Sioban July 1, 2015

July 1, 2015

Hello, I have a problem with my server, it's several times I got "Divide Error: 0000 [#1] SMP". I'm not qualified enough to identify the problem. This is the message, I got : ---------------------------------------------------------------------------------------------------------------------------- [1639377.680125] divide error: 0000 [#1] SMP [1639377.680149] Modules linked in: dm_mod lp parport_pc joydev st sr_mod cdrom xt_multiport nfnetlink_queue nfnetlink nf_conntrack_ipv4 nf_defrag_ipv4 xt_tcpudp iptable_filter ip_tables xt_iprange xt_conntrack nf_conntrack ipt_REJECT xt_mark xt_NFQUEUE x_tables binfmt_misc arc4 ecb md4 hmac nls_utf8 cifs dns_resolver fscache pl2303 usbserial ext4 crc16 mbcache jbd2 snd_hda_codec_hdmi nouveau mxm_wmi wmi video snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm ttm drm_kms_helper drm snd_timer i2c_algo_bit iTCO_wdt snd iTCO_vendor_support soundcore pcspkr evdev serio_raw kvm_intel kvm shpchp i2c_i801 i2c_core lpc_ich mfd_core asus_atk0110 button processor thermal_sys hwmon_vid coretemp loop fuse ppdev parport autofs4 xfs crc32c_generic libcrc32c hid_generic usbhid hid raid1 md_mod sg sd_mod [1639377.680439] crc_t10dif crct10dif_generic crct10dif_common ata_generic ahci libahci ata_piix pata_jmicron atl1 mii libata ehci_pci uhci_hcd ehci_hcd scsi_mod usbcore usb_common [last unloaded: parport_pc] [1639377.680513] CPU: 2 PID: 2618 Comm: pgld Not tainted 3.16.0-4-686-pae #1 Debian 3.16.7-ckt9-3~deb8u1 [1639377.680542] Hardware name: System manufacturer P5K/P5K, BIOS 1201 10/14/2008 [1639377.680571] task: f0855560 ti: efe54000 task.ti: efe54000 [1639377.680589] EIP: 0060:[<c125bfad>] EFLAGS: 00010246 CPU: 2 [1639377.680609] EIP is at div64_u64+0x2d/0x160 [1639377.680626] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000 [1639377.680644] ESI: 00000000 EDI: 00000000 EBP: efe55d4c ESP: efe55d28 [1639377.680662] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [1639377.680680] CR0: 80050033 CR2: b776b000 CR3: 2fd55000 CR4: 000007f0 [1639377.680698] Stack: [1639377.680711] 00000416 00000000 efe55d4c c111f6b6 0000ba44 00000000 00000000 0000005b [1639377.680749] 00000000 efe55d80 c111f97d 00000000 00000000 00000000 0000005b 00000000 [1639377.680788] 00010000 00000001 00000212 00000000 00000416 f0fb0ea0 efe55e18 c1120dce [1639377.680826] Call Trace: [1639377.680845] [<c111f6b6>] ? pos_ratio_polynom+0x36/0xa0 [1639377.680863] [<c111f97d>] ? bdi_position_ratio.isra.11+0x15d/0x200 [1639377.680883] [<c1120dce>] ? balance_dirty_pages_ratelimited+0x17e/0x690 [1639377.680903] [<c11985f2>] ? generic_write_end+0xb2/0xe0 [1639377.680932] [<f8073380>] ? xfs_vm_write_end+0x40/0xe0 [xfs] [1639377.680951] [<c11171a2>] ? generic_perform_write+0x132/0x1a0 [1639377.680981] [<f8080abb>] ? xfs_file_buffered_aio_write+0xfb/0x1a0 [xfs] [1639377.681011] [<f8080bc9>] ? xfs_file_write_iter+0x69/0x130 [xfs] [1639377.681031] [<c11706d9>] ? cp_new_stat64+0x109/0x120 [1639377.681049] [<c116c099>] ? new_sync_write+0x69/0xa0 [1639377.681067] [<c116c030>] ? do_iter_readv_writev+0x90/0x90 [1639377.681084] [<c116c53d>] ? vfs_write+0x9d/0x1d0 [1639377.681102] [<c116cc06>] ? SyS_write+0x46/0x90 [1639377.681120] [<c147bcdf>] ? sysenter_do_call+0x12/0x12 [1639377.681137] Code: e5 57 56 53 83 ec 18 89 44 24 10 8b 45 0c 89 54 24 14 85 c0 75 40 8b 4c 24 14 8b 5d 08 89 ce 39 cb 0f 87 17 01 00 00 89 c8 31 d2 <f7> f3 31 d2 89 c1 89 f0 f7 f3 89 d6 8b 5c 24 10 89 f2 89 cf 89 [1639377.681292] EIP: [<c125bfad>] div64_u64+0x2d/0x160 SS:ESP 0068:efe55d28 [1639377.681522] ---[ end trace 22f807c15589e633 ]--- ---------------------------------------------------------------------------------------------------------------------------- I also got this message on my SSH session: ---------------------------------------------------------------------------------------------------------------------------- Message from syslogd@shax <mailto:syslogd@shax> at Fri Jun 12 13:55:36 2015 ... shax vmunix: [1639377.681137] Code: e5 57 56 53 83 ec 18 89 44 24 10 8b 45 0c 89 54 24 14 85 c0 75 40 8b 4c 24 14 8b 5d 08 89 ce 39 cb 0f 87 17 01 00 00 89 c8 31 d2 <f7> f3 31 d2 89 c1 89 f0 f7 f3 89 d6 8b 5c 24 10 89 f2 89 cf 89 Message from syslogd@shax <mailto:syslogd@shax> at Fri Jun 12 13:55:36 2015 ... shax vmunix: [1639377.681292] EIP: [<c125bfad>] div64_u64+0x2d/0x160 SS:ESP 0068:efe55d28 ---------------------------------------------------------------------------------------------------------------------------- My system: ---------------------------------------------------------------------------------------------------------------------------- uname -a Linux shax 3.16.0-4-686-pae #1 SMP Debian 3.16.7-ckt9-3~deb8u1 (2015-04-24) i686 GNU/Linux ---------------------------------------------------------------------------------------------------------------------------- Have you any idea from where it can comes ? Or at least, tell where I should go to have some help (kernel.org ?)

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Query on ubifs_assert
by pavi1729 July 1, 2015

July 1, 2015

Hi, FILE: fs/ubifs/misc.h : FUNCTION : ubifs_compr_present "ubifs_compr_present" function has "ubifs_assert" which checks for the valid compression value and does a stack_dump if not. Could there be a case where the "compr_type" is corrupt; if yes, then does a stack_dump suffice? Thus if compr_type is invalid then the below return is not reliable. return !!ubifs_compressors[compr_type]->capi_name; So where does this end, eventually does it go to a point where the volume get corrupt and not unmountable ? Cheers

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