Your question isn't specific enough, so I'll just guess. Let's say "int". In 32 bit, AFAIK it's 4 byte, but in 64 bit (like IA 64, not sure if it's x64) it's 8 byte. So, if you just say "int", you will likely getting screwed up. By using types like u_int or something like that, you pretty much say "I mean 4 byte kind of integer" etc -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: ...

hi all, i have seen many places in kernel where the variables specially the structures should be of fixed size independent of the architecture. i went through the definitions of them but dint get clearly (or frankly say ...dint get them even a bit) . so ,can please someone help me to understand this?? thanks in advance for help........ -- ........................ *MOHIT VERMA*

Please reply all..I added back list. I am not sure of your definition of boundary, but I would say it does the opposite. It tells the compiler not to align the struct to boundaries. -- John _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

Linux (compiler actually) supports C99 fixed-width types such as 8, 16, 32, 64 bits. Just look through the include/linux/types.h and small example here: -- Regards, Denis _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

that is it mulyadi. but how the compiler or kernel forces the things to get -- ........................ *MOHIT VERMA*

Hi, I recently read about the Linux kernel implementing ASLR to prevent buffer overflow attacks. I would like to have a look at how this is implemented by reading the kernel source code. Could someone offer a few pointers on where to start looking?(It would make my work slightly easier.) Thanks, zm _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

Hi.. AFAIK, once x86 didn't supported due to floating point related registers are not correctly (or even doing?) saved and restored during context switching. So maybe it is fixed now... -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com _______________________________________________ Kernelnewbies mailing ...

Hi Mohit, That is correct. In some architectures, attempts to use floating point from the kernel will work. I've seen some x86 code that uses it. However, with ARM for example, there is no float support in the kernel, and some ARM architectures have no floating point support in the hardware either. For ARM, there is a kernel implemented emulation of the floating point instructions, but these can only be called from user space. There are also some ARM software floating point libraries (aka ...

Julie, I think the issue is the kernel is extremely concerned with the efficiency of the syscall path. Very legitimately some benchmarks just measure that one path to see how many thousands of syscalls per second can be made. To accelerate that path as much as possible, the linux kenel chooses not to incur the overhead of preserving the FP registers on every syscall. So kernel code that uses FP must first ensure any registers it uses are preserved. I don't recall ever writing any FP ...

Hi.... I cc: the reply to the new list address. I hope you don't mind.... Now, let's what I can share here.... No kidding? 1 Gig? Wow.... But that's alright, I think that still make sense ... highly frequent sock related cache creation I guess.... AFAIK when it can no longer "grow".... same like page cache, it will grow to fill your RAM until it exhausts everything left by anonymous page allocation plus some amount of reserved pages. And AFAIK too, it's tunable, but I couldn't recall ...

2.6.21 is so obsolete and old and insecure it's not funny. Please use a modern kernel version. good luck, greg k-h _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

Hi all, This might be a silly question, but I want to make sure I understand things correctly. I have a driver with a sysfs entry to get the next data sample every time I read the file. Used like below it works wonderful: # cat next 0x15814 # cat next 0x1682B The last 12 bits are the sample and the first (20) bits are the channel the sample is from (some ADC hardware board with 24 inputs). Now I have some C code that will loop periodically to collect the samples and do some magic ...

Admin Functions - Edit<http://support.github.com/discussions/repos/5208-not-able-to-close-from-the-gitkernelorg-git-remote-goes-to-infinite-loop-on-poll-and-select/comments/1> - Remove<http://support.github.com/discussions/repos/5208-not-able-to-close-from-the-gitkernelorg-git-remote-goes-to-infinite-loop-on-poll-and-select/delete> Hi All, I am sorry, If this question is not relevant here. If not please suggest me from where I can get help : I am trying to clone from the ...

Thanks a lot for this good information Regards Victor Rodriguez _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

I am talking about scheduling latency and more important network latency On Mon, Jan 3, 2011 at 3:06 PM, Mulyadi Santosa _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies