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Questions about complete
by loody Jan. 8, 2011

Jan. 8, 2011

Dear all: I know complete will wake up the process who call wait_complete. Is there any methods I can use to measure how long from calling complete to the process that detect done=1? Regards, miloody

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LDD3 examples updated
by Javier Martinez Canillas Jan. 8, 2011

Jan. 8, 2011

Hello, I see many people in the list asking where do I start? In my opinion the best way to learn kernel development is first learning some basic concepts and start coding to get your hands dirty. The Linux Device Drivers 3 book is a good start. Both the book and source code examples are freely available. The problem is that the book is a few years old and the example drivers do not compile in recent kernels. I started a project to keep the LDD3 examples up-to-date with recent kernels. The git tree can be cloned from git://github.com/martinezjavier/ldd3.git I will try to keep the code always in sync with linux-next but there will be tags to stable versions. Now there are tags that compile with kernel versions 2.6.32, 2.6.35 and 2.6.37. I didn't try all the drivers with the three kernel versions, just compile tested. So any bug, comment or patch is always welcome -- Best regards, ----------------------------------------- Javier Martínez Canillas (+34) 682 39 81 69

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How does the kernel setup the file system
by Fu Kai Jan. 8, 2011

Jan. 8, 2011

hi folks, I'm looking the source code about linux file system recently. I have scanned over ext2, and now I'm very curious about how does the kernel setup the ext2 up, but I couldn't locate the corresponding code. Could anybody give any advice for me? Thanks, owr

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enabling bridge support in 2.4.26 Debian kernel
by Don Tucker Jan. 7, 2011

Jan. 7, 2011

Hello, I recently rebuilt a 2.4.26 kernel, and selected [M] 802.1d Ethernet Bridging during the "make menuconfig" stage. When I attempt the "make modules_install" stage, I get errors at the end when depmod is run (because I am cross-compiling on a different platform (i386 for ARM), and running with a different kernel (2.6 instead of 2.4)). So, I wait until I've copied all of the modules over to the new platform and then run depmod there. When I do, this is the response I get: unresolved symbol br_ioctl_hook unresolved symbol br_handle_frame_hook I'm not sure how to resolve these errors. It seems like some other module is required in the build. If I set CONFIG_BRIDGE=y in the .config file (have to manually edit, as this option is not allowed with "make menuconfig"), and rebuild, I don't get any unresolved symbol error with depmod. BUT, when I actually try to use bridge-utils I get an error indicating that the kernel was not configured with bridge support! root@ts7000:modules# brctl addbr br0 add bridge failed: Package not installed At first I thought this might mean that bridge-utils wasn't installed, but I typed "dpkg --get-selections" and it is indeed installed. Can anyone help me to get bridge support enabled in the kernel? Thank you for any assistance. Don

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book request
by mohit verma Jan. 7, 2011

Jan. 7, 2011

hi all, i am sorry to ask but i have to........ i have mistakenly formated my books-containing partition . so can please someone upload some standard kenrel related books like: essential kernel,LDD,LKD (robert love) and some others if he/she wants to. i know that asking for this much huge data from someone alone is foolish so please guys ............... thanks for this generosity in advance. -- ........................ *MOHIT VERMA*

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Some Questions about Kernel Page Table
by lichangshou Jan. 7, 2011

Jan. 7, 2011

Hi all, In linux-2.6.35.4, the page size of kernel image is 2M, which means that the entity in pmd is PFN pointing to physical page. For research, I want to change the page size of kernel image to 4K. I modified the content of pmd to make each entity of pmd point to a new page table. Here is the my related code: --------------------------------------------------------- 542 pte = alloc_low_page(&pte_phys); // allocate a new page for page table 544 last_map_addr = phys_pte_init_remap(pte, address, end, new_prot); // initiate the entity of new page table 545 unmap_low_page(pte); 546 547 spin_lock(&init_mm.page_table_lock); 548 pmd_populate_kernel(&init_mm, pmd, __va(pte_phys)); // modify this pmd entiity, make it point to the address of new page table. 549 550 spin_unlock(&init_mm.page_table_lock); ------------------------------------------------------------------------------------ After adding those code to kernel source, I test the new complied kernel, but the kernel always reboot and can't work. Thinking long time, I can't fix where the bug is. Any suggestions for me? Thanks, Lee

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unsubscribe
by marduk Jan. 6, 2011

Jan. 6, 2011

unsubscribe kernelnewbies

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nameidata data structure again
by mohit verma Jan. 6, 2011

Jan. 6, 2011

hi folks, we have qstr data structure part in nameidata structure in name resolution. so it may work like this : nameidata->path->dentry->qstr. it is the real name component in a path name for that directory ro file (i think so). so what is the need of having another qstr like: namidata->qstr (ie. last) in nameidata structure. sorry ,it may seem foolish to u guys but i ............ thanks in advance. -- ........................ *MOHIT VERMA*

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ML archive
by ugubarr＠mail.com Jan. 6, 2011

Jan. 6, 2011

Hi there, The actual archive contains only December and January. Were are the older archives? Thanks, Ugu

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cache quota
by sanoj Jan. 6, 2011

Jan. 6, 2011

Hello my doubt is if linux has any user quota for the usage of page cache, i.e. if a user is doing a disk intensive operation, will the I/O performance for other users other users be affected as they may incur more cache misses. thanks, sanoj

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