Re: Question on initrd and initramfs
Hello, On Sun, Sep 30, 2012 at 5:01 AM, Mulyadi Santosa wrote: > Hi Tobi... > > On Sun, Sep 30, 2012 at 1:10 AM, Tobias Boege wrote: >> Have you read Documentation/filesystems/ramfs-rootfs-initramfs.txt? I didn't >> but there are some eye-catching statements: >> >> 1. initramfs becomes a rootfs (l. 86) >> 2. rootfs is a special instance of ramfs (l. 73) >> 3. ramfs cannot be turned off (l. 29ff) >> >> This means that initramfs cannot be turned off. >> >> 4. initramfs is a gzipped cpio archive and contained within the kernel >>(l. 85) and so is the cpio extractor code (l. 166f) >> 5. initramfs is automatically loaded as rootfs (l. 86) > > Interesting catch, Tobi. for sure sometimes I am too lazy to read > the documentation. > Just wanted to add something fresh. I'm reading through ramfs sources: $ wc -l fs/ramfs/*.c 55 fs/ramfs/file-mmu.c 267 fs/ramfs/file-nommu.c 289 fs/ramfs/inode.c 611 total 600 lines! This is really readable! There's even a note from Linus saying it's a nice template code to read as a fs starting point. Interesting, uh? Ezequiel ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
enabling config_wireless_ext
Sorry Confused. I'm building from the latest 3.6 kernel from git in order to be able to submit patches. Well if I get that far. I'm running the built on my netbook but I'm having problems building my wifi drivers against the 3.6.0 kernel. Basically I've got an error: error: 'struct net_device' has no member named 'wireless_handlers' Which is fair enough if you look in the kernel source include/linux/netdevice.h there's a "'#ifdef CONFIG_WIRELESS_EXT" So this is easy all I have to do is enable that switch and rebuild the kernel. You might not believe it but that's were I come unstuck. I did a search in "make menuconfig" for that switch and it does provide some info but normally when I do a search the help tells me where to find it. (Which is a God send.) So searching for it is finding it but not giving me suitable help on where it is in the menu structure. I then decided that I'd search for it in the .config file. Can't find it in there either. This is a mailing list for newbies and I know this is a stupid question but can anybody advise me on where that switch is in make menuconfig? I did find this page out there but that's pointing at Kconfig in source code not where it is in the menus: http://cateee.net/lkddb/web-lkddb/WIRELESS_EXT.html ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: how to process data recvd from a device that wont give interrupts
On Fri, Oct 5, 2012 at 2:32 AM, Kshemendra KP wrote: > > Hi Devendra, > > In the kernel thread if you continuously in a loop read a register it > will increase > the CPU usage. After every register read if data is not ready call a > schedule() (or related > call). This may help to reduce CPU utilization > [please no top posting], I Know, i didn't say i use copy_from(to)user in the softirqs. its wrong, and you can use the copy to (from) user in a different context, ie our fops callbacks. coming to threads, these are also one and the same as your timers, and your threading is wrong, since there is only register read, should be checking at every 10 - 20 msec, so coming back to timers :) no? anyways thanks for letting me know . > ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: IPSec/IPv6 test gets unexpected ENOBUFS on connect on linux 3.2
On Mon, Oct 1, 2012 at 11:49 AM, Bhushan Kumar wrote: > HI, > > I am getting the below mentioned error for Linux kernel 3.2.18.i am > looking for patch for the same. If anyone having suggestion\patch is much > appreciated . And I will be thankful for ASAP response. > > > > “ TCP/IPv6 test doing repeated heavy sending and reconnecting, connect()s > > start to fail with ENOBUFS on the Linux 3.2.18. “ > Your system is running low on memory. I don't think it is specific to 3.2.18. The kernel's buffers for I/O operations are all in use. In GNU, this error is always synonymous with ENOMEM; you may get one or the other from network operations. -- Manavendra Nath Manav ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
New member queries..
Hi Guys, I'm new to linux kernel development (only a few hrs old i may say). I've been working with the solaris kernel from the past year and now would like to concentrate on linux as well. "My area of expertise is Filesystems". Here are a few things i would like to know from you guys. 1.) I've looked at the bugzilla pages, how do i choose a bite sized bug to start with? (Is there such a concept at all?) 2.) I looked at kernelJanitors page as well hoping to find info but nothing much there . Can anyone help me get started? Thanks Shampavman ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
