Re: Unable to compile linux-kernel pulled from nf-next tree

On Wed, 20 Dec 2017 02:28:40 +0530, Harsha Sharma said: > Using `make localmodconfig` doesn't load module nfnetlink in which I'm > making the changes. 'make localmodconfig' simply uses the output of 'lsmod' - so if you want nfnetlink included, simply modprobe a module called nfnetlink before you

Re: Unable to compile linux-kernel pulled from nf-next tree

On Tue, 19 Dec 2017 22:15:02 +0530, Harsha Sharma said: > This is the output of make. > Building modules, stage 2. > MODPOST 4905 modules > fs/ufs/ufs.o: Invalid argument > scripts/Makefile.modpost:92: recipe for target '__modpost' failed You didn't fill up the filesystem you were building

Re: Unable to compile linux-kernel pulled from nf-next tree

On Tue, 19 Dec 2017 18:33:51 +0530, Harsha Sharma said: > cp: cannot stat 'net/nsh/nsh.ko': No such file or directory There was almost certainly a compile error for this. Go back and look at the 'make' output. make |& tee build.output is your friend. pgpoAsJs2Hmtv.pgp Description: PGP

Re: hrtimer_interrupt time sync issues across cores

On Wed, 13 Dec 2017 23:01:57 -0800, Rajasekaran Chandrasekaran said: > In our multi-core x86 based system that is running 3.4.19 version of As Greg already pointed out, that's ancient history suitable only for kernel archaeologists and masochists. > Problem: > > Inside hrtimer_interrupt

Re: Virtual Memory map

On Tue, 12 Dec 2017 20:14:35 +0100, Damian Tometzki said: > How are the bits (in brackets) calculated in the virtual memory map ? For x86_64 architecture, the 47 comes from the fact that currently shipping CPUs have an architected 48 bit wide memory address bus, and the fact that Linux does a

Re: sched_child_runs_first doesn't work

On Sat, 09 Dec 2017 11:04:09 +0330, alireza sanaee said: > I think if it works in that way, it doesn't make sense at all Parent > and child ordering rules should preserve even on different cores! Find where in kernel/sched.c there's specific code to guarantee that if the child/parent is

Re: how to hard hang the kernel from userspace?

On Thu, 07 Dec 2017 15:12:15 -0800, Daniel Walker said: > So typically you have a process which updates the watchdog periodically > which I call a petting process. As I said the purpose is to trigger the > watchdog by starving the petting process (i.e. kick process) , then the > watchdog reboots

Re: how to hard hang the kernel from userspace?

On Wed, 06 Dec 2017 16:32:26 -0800, Daniel Walker said: > and it works sometimes on UP, but it doesn't work on SMP. I also tried Thinking about *why* that hangs a UP should explain why it doesn't work on SMP. > adding in "taskset" to pin multiple version of the "yes" command to each > cpu in

Re: Any trick to remove a D-state dead process without rebooting?

On Wed, 06 Dec 2017 10:07:44 +0700, Mulyadi Santosa said: > If it is indeed coming from nfs mount, check if it is mounted in > synchronous mode, and try to switch to async. See if it made any differences Do note that async mode, due to how it works, *does* open a possibility of data loss - on a

Re: Any trick to remove a D-state dead process without rebooting?

On Tue, 05 Dec 2017 12:03:56 +0800, Yun-Chih Chen said: > > 2) cat /proc/NNN/stack will give you a hint where the syscall is wedged. > > http://ix.io/CMN > It seems that they all have something to do with autofs or filesystem. Fortunately, you've hit an actually fixable problem that you may

Re: Any trick to remove a D-state dead process without rebooting?

On Tue, 05 Dec 2017 09:37:26 +0800, Yun-Chih Chen said: > Does anyone know of any hacks that remove a D-state dead process whose > parent is pid=1 (actually systemd), without rebooting? The problem is that D state means that the process is in the middle of a system call. That means that kernel

Re: Public Kernel Development

On Fri, 01 Dec 2017 20:21:36 +, Chris Obbard said: > The drivers I’m releasing probably don’t belong in the kernel Again: Why are you saying that? It wouldn't be the first time we carried a driver for an uncommon device (heck, we carried an entire *architecture* for several years for a

Re: Public Kernel Development

On Wed, 29 Nov 2017 11:16:05 +, Chris Obbard said: > Currently I am writing drivers for ARM boards (think along the lines of > Raspberry Pi HATs, it doesn't belong in mainline; Why not? If you upstream your patches, you don't have to play the "rebase every version" game. pgpYoYgvyOAhK.pgp

Re: kernel development cycle

On Wed, 22 Nov 2017 11:07:09 +1100, "Tobin C. Harding" said: > Hi, > > Would someone please be able to expound on the stages of the kernel > development cycle. > > In particular I would like to learn what a hobbyist kernel developer > should be focusing their attention on during different stages

Re: mmap patch works in Virtualbox, not in QEMU

On Sun, 19 Nov 2017 11:25:57 +0300, Lev Olshvang said: > I downloaded Buidroot and buil QEMU x86_64 environment with kernel 4.9 > I applied my patch to mmap (added MAP_DENYWRITE for shared libraries) before > building kernel. Did you test to make sure that it doesn't apply that flag to mmap for

Re: Invoking a system call from within the kernel

On Sat, 18 Nov 2017 14:09:31 -0500, Demi Marie Obenour said: > Only whitelisted system calls would be allowed, such as open(), read(), > and write(). Async getuid() would not be allowed. Nor would async > exit() or exit_group(). You missed the point - If you allow async calls, you need to deal

Re: Invoking a system call from within the kernel

On Sat, 18 Nov 2017 13:15:27 -0500, Demi Marie Obenour said: > However, the ioctl I actually want to implement (see above) does the > system call asynchronously. That isn’t possible using the existing > APIs. Ever consider that it's because there's no clear semantics to what executing an

Re: How to add a haradware breakpoint on a physical memory address?

On Fri, 17 Nov 2017 17:57:26 +0800, kipade said: > I found some memory was rewrite by gpu module, but i have not found where it > layout. > I just use samples hw_breakpoint module for memory monitor. > However, i found it only monitor on a virtual address, > in another words, if two variable

Re: memory usage between kernel versions

On Tue, 14 Nov 2017 09:42:33 -0800, Mike Harless said: > 3.14 kernel: > 4c01-4c0d r-xp 00:0e 1177 /lib/libc-2.20-2014.11.so > Size:768 kB > Rss: 416 kB > Pss: 12 kB > > 4.9 kernel: > 4c01-4c0d r-xp 00:0e 1177

Re: Why replacing running executable file is forbidden, but overwriting of memory mapped shared object is allowed ?

On Fri, 10 Nov 2017 17:43:37 -0500, Ruben Safir said: > On 11/10/2017 12:49 PM, Jeffrey Walton wrote: > > Microsoft technology > > That is an oxymoron Given the number of systems running Microsoft products, it doesn't seem to be quite as much of an oxymoron as you think. Might want to spend

Re: Why replacing running executable file is forbidden, but overwriting of memory mapped shared object is allowed ?

On Fri, 10 Nov 2017 21:04:22 +0300, Lev Olshvang said: > I am going to patch inode reference count of mapped shared libs Congrats. You just corrupted your file system. Hint 1: What happens if you decrement the count by one unnecessarily, and later on, probably during system shutdown, the

Re: thread polling for timestamp on socket's error queue doesn't wake up

On Fri, 10 Nov 2017 14:39:00 -0200, Ricardo Biehl said: > I've notice that polling for timestamp in socket's error queue from a thread > that hasn't sended the packet results in not waking the polling thread when an > event arrives. That seems reasonable. Under what conditions would you want to

Re: Why replacing running executable file is forbidden, but overwriting of memory mapped shared object is allowed ?

On Fri, 10 Nov 2017 16:30:17 +0300, Lev Olshvang said: > But the attempt to replace shared object library succeeded, and I do not > understand the logic of this decision You might want to do an lsof after such an upgrade, and ponder what *really* happened. Hint 1: How do you do this in a way

Re: What's the exact difference between make silentoldconfig and oldconfig?

On Fri, 10 Nov 2017 09:26:52 +0800, Shiyao MA said: > Hi, > > The man help says, silentoldconfig is like oldconfig, but quietly and > additionally updates dependencies. > > 1. What does it mean by "quietly"? Basically, it will auto-select the "default" answer to any question (it's the one that's

Re: How inode of /proc. /sys keep the same number on a given system

On Wed, 08 Nov 2017 21:22:47 +0300, Lev Olshvang said: > Hello all, > > I observe that between reboot inode of files in /proc and /sys filesystem > keep the same number. > > I need to know whether I can rely on this in my program, and under what > conditions this assumption became incorrect? If

Re: Ask for the linux memory managment mailing list

On Sun, 05 Nov 2017 16:04:48 +0800, VOID 001 said: > Hi, > > I am looking for the way to subscribe to linux-mm mailing list, but > when I refer to http://vger.kernel.org/vger-lists.html I can not found > the mailing list named linux-mm, could anyone please point it out for > me? Thanks in advance.

Re: is there any more to having a single interrupt drive multiple handlers than IRQF_SHARED?

On Thu, 26 Oct 2017 16:32:42 -0400, "Robert P. J. Day" said: > now, i do realize that it can be used along with a unique dev_id > values to isolate a *particular* handler amongst a group of handlers, > but if one simply wants to trigger *all* handlers registered for that > interrupt, is there

Re: architecture conditional

On Tue, 17 Oct 2017 07:36:42 +1100, "Tobin C. Harding" said: > Jason A. Donenfeld suggested (offered to) add a helper function in siphash, > along the lines of > siphash_1u() but we still need to know the exact size of the return value (so > we can drop half of it > if it is 64 bits). We just

Re: boot time variable

On Tue, 10 Oct 2017 10:17:09 +1100, "Tobin C. Harding" said: > I would like to create a boot time variable i.e a variable that is set once > at boot time. Variable > does not need to be globally accessible. (actually I am using two variables). The canonical way to have stuff happen at boot is

Re: help in the MM Area of the Linux Kernel

On Mon, 09 Oct 2017 21:58:27 -0400, Jeffrey Walton said: > On Tue, 10 Oct 2017 09:50:21 +0800, Yubin Ruan said: > > um...terabyte of RAM? Can you name one of those machine with so much RAM? > > 4 TB: > http://investors.cray.com/phoenix.zhtml?c=98390=irol-newsArticle=1855272 > 64 TB:

Re: help in the MM Area of the Linux Kernel

On Thu, 05 Oct 2017 18:14:08 +0200, Damian Tometzki said: > i'am intrested in helping and Bug Fixing in the mm area of the linux > kernel.  > > For driver development is it clear check in the staging area the > TODO's.  > > And what is the process for other areas of the kernel for example mm >

Re: Syscall hijacking x64- unable to handle kernel paging request at ffffffff91000018

On Thu, 05 Oct 2017 20:04:12 +0200, "Wiktoria Lewicka" said: > I write kernel module which replace syscall and have a problem. Some people, when confronted with a problem, think "I know, I'll use regular expressions." Now they have two problems -- Jamie Zawinski What problem were you trying to

Re: How to verify linux-next

On Mon, 02 Oct 2017 10:11:34 +0200, Kamil Konieczny said: > What about /usr/bin/ssh as init replacement ? Well, if you are OK with your system panicking right away. :) (Hint - the init process needs to be something that can run as a daemon). If you use /usr/sbin/sshd, that has a *slightly*

Re: Input device driver

On Fri, 29 Sep 2017 19:38:49 -0300, "Bruno E. O. Meneguele" said: > 2) I'm using a USB keyboard as the testing device, and TBH I got > confused if I could actually use the input subsystem for that or I > _should_ use HID instead (considering the keyboard is HID compliant). Step 0: Decide if

Re: How to verify linux-next

On Fri, 29 Sep 2017 19:56:41 +0530, Pintu Kumar said: > 1) If you have pointers on how to setup ssh/net connection on QEMU > with busybox, do let me know. Busybox doesn't do that as far as I know, as it's intended as a single-user /sbin/init replacement. You'll need a full-featured userspace

Re: How to verify linux-next

On Fri, 29 Sep 2017 16:08:07 +0530, Pintu Kumar said: > I have a general question. > How do we normally verify linux-next tree? The same exact way you "verify" any other Linux kernel, for whatever definition of "verify" you plan to use. > 1) For Oracle virtual box 5.1.26 with ubuntu-32 bit, the

Re: USB keyboard can NOT wakeup from S3( suspend to RAM )

On Wed, 30 Aug 2017 08:09:55 +0200, Greg KH said: > On Wed, Aug 16, 2017 at 06:03:22PM +0800, jing...@cpu-os.ac.cn wrote: > > But if I do NOT hit the key during the suspending, I CAN wake it up by > > hitting > > the keyboard. > Sounds like your system does not support USB wakeup, which is very

Re: Regarding install uvcvideo driver for Iball chd 20.0 webcam

On Tue, 22 Aug 2017 12:34:12 +0530, vaibhav chaudhari said: > I want to configure iball chd 20.0 webcam on ubuntu 14.04 with kernel > version of 3.13.0-24-generic. > for that i want to install uvcvideo driver please suggest me how to install > uvcvideo driver.

Re: Don't know where to start linux kernel programming

On Tue, 22 Aug 2017 12:48:42 -0400, Cindy-Sue Causey said: > An observation that may just mean I haven't stumbled upon it yet is > that it would be nice to... stumble upon... a list of kernel problems > that *kernelnewbies* could cut their teeth on. I do understand that > this is a naive wish

Re: Don't know where to start linux kernel programming

On Tue, 22 Aug 2017 16:22:34 +0530, SUNIL KHORWAL said: > I'm new to linux kernel programming, I want to be a linux kernel hacker but > i don't know where to start. To repeat what I said previously on the subject: https://lists.kernelnewbies.org/pipermail/kernelnewbies/2017-April/017765.html

Re: Kernel build warnings

On Tue, 08 Aug 2017 05:36:34 -, Amit Kumar said: > When I compile arm64/defconfig kernel with W=1, build emits a lot of > warnings. When patch is required to be "build clean" then why warnings are > there? I want to understand. The warnings that come out with the default W=0 are by an large

Re: new sysctl tunable knob for tcpip

On Mon, 31 Jul 2017 15:16:34 +0200, Massimo Sala said: > I wish to suggest to developers to add this new knob : Note that most of the existing knobs were chosen fairly carefully, and that sometimes, the values chosen aren't immediately obvious, because they have to also take into account

Re: Need help to understand Linux kernel source versioning systems

On Tue, 25 Jul 2017 20:14:45 +0800, Yubin Ruan said: > For example, let's say we are at 4.2 (or, 4.2.0) now. Before we move > to 4.3, there would > 4.3.1-rc, 4.3.2-rc, ..., 4.3.7-rc. After 4.3.7-rc, we have 4.3 (or, 4.3-rc1, 4.3-rc2, ... 4.3-rc7. pgpV4kQj9amsW.pgp Description: PGP signature

Re: kthread_stop always returning -EINTR?

On Tue, 18 Jul 2017 17:11:19 -0300, Martin Galvan said: > task_struct, it's not clear to me why I didn't get to see the thread > function printks. If the thread function finished before reaching > kthread_stop, I should be able to see them, right? The only way I can > see them is by removing the

Re: kthread_stop always returning -EINTR?

On Tue, 18 Jul 2017 15:13:08 -0300, Martin Galvan said: > I thought kthread_create/bind don't actually run the thread function? > At least that's what the comment says. It's the wake_up_process() that causes the problem... > > * If threadfn() may call do_exit() itself, the caller must ensure >

Re: kthread_stop always returning -EINTR?

On Tue, 18 Jul 2017 13:00:11 -0300, Martin Galvan said: > Hi everyone! I'm doing a bit of testing on the Linux kthread functions, and h > int function(void *data) > { > printk(KERN_DEBUG "CPU: %u\n", smp_processor_id()); > > do_exit(0); /* Not sure if this is ok */ > } Note that this

Re: new sysctl tunable knob for tcpip

On Thu, 06 Jul 2017 09:23:46 +0200, Massimo Sala said: > I have an idea about a new sysctl knob. It is under net.ipv4. Step 0: Identify whether it is even a good idea. TCP/IP is tougher than you think, especially when you get into congestion control. Step 0.1: Figure out if your brilliant idea

Re: Query regarding kernel modules intercepting system call.

On Sat, 08 Jul 2017 21:08:40 +0530, Ajinkya Surnis said: > The purpose of assignment is to check the authenticity of the user > executing the system call, and prevent certain users from executing, kind > of like certain security programs (although I don't exactly know how they > work). The only

Re: how to get consistent value of "nf_conntrack_htable_size" and "nf_conntrack_hash" in a kernel module ?

On Fri, 07 Jul 2017 23:55:25 +0800, Shiyao Ma said: > I want to foreach all the `struct nf_conn's in my out-of-tree kernel module. What are you trying to do? Hint: the very concept of "all" the nf_conn's is a very racy one, especially on high-powered servers that have multiple 40 gigabit

Re: building af_packet as a kernel module

On Mon, 03 Jul 2017 16:36:01 +0200, Kamil Konieczny said: > https://stackoverflow.com/questions/448999/is-there-a-way-to-figure-out-what-is-using-a-linux-kernel-module > and short answer is to use 'lsof' command (ls open files), > if lsmod fails to give ref info That's the short - and incorrect

Re: Keeping track of called syscalls in real-time

On Wed, 28 Jun 2017 19:06:56 -0300, Ben Mezger said: > I'm actually formulating my thesis project. I am looking for a way to > intercept system calls (those chosen by the users), where I can keep > track of what syscall has been called and by who. As I said before - knowing this, what do you *do*

Re: Keeping track of called syscalls in real-time

On Wed, 28 Jun 2017 17:48:15 -0300, Ben Mezger said: > Can the kernel keep track of all the system calls that were called by an > application/module in real-time? > I know I can statically use strace, or even gdb, but I am looking for a > solution in real time when the application/module is

Re: Kernel schedules kernel tasks on isolated cpus, SCHED_FIFO prevents kernel tasks from running

On Wed, 28 Jun 2017 14:02:37 -0500, Andrei Hurynovich said: > The question is why this old 2.6 kernel decide that it needs per-cpu > events and kblockd tasks. You have per-cpu events ecause your real-time process issues syscalls, and syscalls do things inside the kernel that require per-CPU

Re: Kernel schedules kernel tasks on isolated cpus, SCHED_FIFO prevents kernel tasks from running

On Wed, 28 Jun 2017 08:39:07 -0500, Andrei Hurynovich said: > We set sysctl kernel.sched_rt_runtime_us = -1 so realtime threads are > NEVER interrupted. > According to /proc/sched_debug, it seems that kernel still schedules > some SCHED_OTHER(e.g. non-realtime) kernel tasks to isolated cpus - for

Re: Virtualbox + kgdb: Can't see vmlinux symbols

On Fri, 16 Jun 2017 13:24:58 -0700, Kamran Khan said: > This is happening only with kernel 4.8+. > > When I compile kernel 4.4 with a stock Ubuntu Xenial .config, symbols > appear just fine. > > When I compile kernel 4.8/4.10 with Yakkety/Zesty stock configs the > symbols disappear. What happens

Re: How to use V4L2 dmafd with sendfile?

On Tue, 06 Jun 2017 15:02:45 +0200, "Frank Smith" said: > I want to use sendfile to send my images really fast over the network. Step 0: Define "really fast". (I work with boxes that have LACP bonds of 2x40gbit ethernet interfaces - your v4l2 device is probably the slow link at that point, and

Re: Fixing warnings

On Sat, 03 Jun 2017 02:47:55 +0530, srishti sharma said: > Can we fix two warnings in a single patch ? Depends what the two warnings are. If they're two actual kernel warning messages, probably best off doing 2 patches. If it's 2 complaints from checkpatch, it depends. If they're two or more

Re: Is vnode number also limit system-wide number of open file?

On Thu, 01 Jun 2017 17:15:29 +0800, Yubin Ruan said: > Regarding to inode number, I notice that nearly every filesystem has tree > representation of the inode number: > 1. on-disk inode number > 2. in-memory inode number > 3. VFS inode number > How are these related? I mean, if they

Re: Update a newly-created '.config' file with some predefined values

On Tue, 30 May 2017 12:28:34 +0300, Roman Storozhenko said: > Hello everybody, > > I have a host machine and I have a VM machine running CentOS 7 with 3.x. Ther e is > a kernel source tree on the host. I have made 'make menuconfig', > populated all options that I want to have in my custom kernel

Re: Applying the pagecache monitoring patch

On Sat, 27 May 2017 21:59:54 +0800, Yun-Chih Chen said: > What I did is: > 1. Checkout to a commit near 2011/7/18 (the latest commit at the time > the patch was sent) > 2. Cherry-picked the three commits from tracing/mm > 3. Apply the patch > > I failed at step 3. > > Anyone has any suggestion on

Re: what is the current/ongoing state of userspace access to GPIO?

On Thu, 25 May 2017 15:20:06 -0400, "Robert P. J. Day" said: > On Thu, 25 May 2017, Greg KH wrote: > > > On Thu, May 25, 2017 at 03:02:24PM -0400, Robert P. J. Day wrote: > > > > > > thoughts? > > > > Why not ask on the linux-gpio mailing list? > > huh, i didn't even know there was such a

Re: Mechnism for sharing data between kernel and user space

On Mon, 22 May 2017 10:13:08 +0530, jitendra kumar khasdev said: > I am exploring the mechanism for sharing data between kernel and user > space. There are following mechanism I have found > >1. copy_to_user/copy_from_user >2. Netlink sock >3. /proc, /debugfs etc. > > Other than this,

Re: device tree nodes and platform drivers

On Thu, 18 May 2017 12:38:01 -0400, Max Ruttenberg said: > >On Thu, May 18, 2017 at 12:34 PM, wrote: > >> On Thu, 18 May 2017 12:23:18 -0400, Max Ruttenberg said: > >> > >>> I figured it out... the system I am working with never makes a call to > >>>

Re: device tree nodes and platform drivers

On Thu, 18 May 2017 12:23:18 -0400, Max Ruttenberg said: > I figured it out... the system I am working with never makes a call to > of_platform_populate(NULL, NULL, NULL, NULL) and instead ops for > subsystems manually probing the device tree. Live and learn. So submit a patch to add the call.

Re: Regarding The Eudyptula Challenge

On Tue, 02 May 2017 10:20:21 +0530, Anil Nair said: > Other than the instructions mentioned in > http://eudyptula-challenge.org, is there anything that i am missing? You're missing the fact that the challenge has been overwhelmed by entrants, and that it can take as much as a few weeks for them

Re: endian patches

On Mon, 01 May 2017 09:26:40 +1000, "Tobin C. Harding" said: > Should [drivers/staging/*] patches to endian code be tested on hardware > before submission? The first obvious question is: Is the hardware even available for the opposite endian systems? pgpDEe4BWVaNe.pgp Description: PGP

Re: Task in Linux kernel

On Tue, 25 Apr 2017 20:52:17 +0530, Nagaraju Bellapu said: > What is the task put to sleep and schedule term referring while using > wait_queue_event and wake_up functions in a kernel module code.? Well.. think about it. If a task calls a function to wait for something, what task is wanting to

Re: english grammar and patches

On Wed, 26 Apr 2017 10:27:00 +1000, "Tobin C. Harding" said: > This question relates to English grammar and correct usage when > writing gitlog messages and patch series cover letters. > > The writing of gitlog messages is covered in submitting-patches.rst, > of note is the mood to use. It is not

Re: what is the mostly used automation test framework

On Sat, 22 Apr 2017 08:19:24 +0530, Muni Sekhar said: > Yes, to test device drivers(UART, PCIe, SDIO ...) As I said, there's not any good way to make a framework for testing all device drivers. For starters, you can't even get all the hardware into one machine - it's going to be *really* hard

Re: what is the mostly used automation test framework

On Sat, 22 Apr 2017 08:01:39 +0530, Muni Sekhar said: > Can someone suggest what is the mostly used automation test framework > for testing the linux kernel mode drivers? To test what? Device drivers? There's so many different types that I don't think one framework can deal. Consider

Re: What is the fastest way to build and boot a kernel

On Wed, 19 Apr 2017 20:32:31 +1000, "Tobin C. Harding" said: > On Tue, Apr 18, 2017 at 08:59:36AM -0700, Code Soldier1 wrote: > [snip] > > Why the moniker? Could be worse. "Code Cannon Fodder", for example pgpv0BFLq0gT5.pgp Description: PGP signature

Re: How to make per process firewall ?

On Tue, 18 Apr 2017 10:28:20 +0300, Lev Olshvang said: > I would like to constrain process (by name) or group of process to specific > network interface and to specific port. Let's take a step back. What problem are you trying to solve by constraining the processes? pgprLGP7LqYAe.pgp

Re: Problems with adding a sysfs file

On Mon, 17 Apr 2017 01:17:08 -0700, Abhishek Bhardwaj said: > I followed this link to add a sysfs file > http://kroah.com/log/blog/2013/06/26/how-to-create-a-sysfs-file-correctly/ > . > > I set the driver.groups field and declared the attribute and attribute > groups required by the sysfs file.

Re: Per container uptime?

On Thu, 13 Apr 2017 16:34:17 +0200, Fran?ois said: > Do you think it makes sense at all? The bigger question is whether there's stuff that runs in a container that wants the system uptime, which would break under this API change. > Any hint on how to get started on that? It's trivial - note the

Re: How to browse the code

On Thu, 13 Apr 2017 08:41:18 -0300, "Daniel." said: > The Makefile has targets for indexing the kernel.. Sometimes "find -exec > grep" helps... I will take a look in opengrok find |xargs grep. Will run a lot faster because it runs one grep for several hundred files, rather than one per file.

Re: How to contribute (was Re: Kernelnewbies Digest, Vol 77, Issue 7

On Wed, 12 Apr 2017 20:25:11 +0200, "Arthur Brainville (Ybalrid)" said: > So, the best "branch" of developement to test if it doesn't break our > system is the linux-next branch, or the mainline kernel (currently > tagged by Linus as 4.11-RC6) ? Depends how brave you are. Linus is currently at

How to contribute (was Re: Kernelnewbies Digest, Vol 77, Issue 7

On Wed, 12 Apr 2017 10:30:27 +0800, Tran Ly Vu said: > How exactly do i start to contribute to linux community, i.e fix bug, etc Step 0: Figure out *why* you want to contribute to the Linux kernel. Did your boss just tell you that you have 6 weeks to write a driver for your company's new

Re: USB shutdown issue

On Wed, 12 Apr 2017 09:49:38 +0900, manty kuma said: > The source code that is doing this is here - > http://androidxref.com/kernel_3.10/xref/drivers/usb/core/hub.c#4693 4693/* 4694 * EM interference sometimes causes badly 4695

Re: Have been tested with 4 usb wifi adaptor, all loss packet when ping to router

On Sat, 01 Apr 2017 02:14:18 +0800, Hao Zhang said: > hi all, > i use usb wifi dongle rt5370/rt3070/rtl8192cus/rtl8178 on embeded > board based kernel 3.10.0 , they all loss packet when ping to router, > and then ifconfig can show below that > it seem some packet were been dropped, What does that

Re: 0 bit shift

On Thu, 30 Mar 2017 09:59:44 +1100, "Tobin C. Harding" said: > What is the reason for the zero bit shift in this code please? > > #define SDIO_STATE_PRESENT(1<<0) /* present in sysfs */ > > file: include/linux/mmc/sdio_func.h Most likely, to indicate that it's a bitmask in the

Re: where's the definition of trace_kfree_skb?

On Tue, 28 Mar 2017 16:15:57 +0800, Shiyao Ma said: > I saw this function invocation, > trace_kfree_skb(skb, __builtin_return_address(0)); > > so I grepped the source for "trace_kfree_skb", but I found no where it's > defined. For some uses, the Linux kernel forms a definition via the

Re: Rebase against linux-next tree?

On Thu, 16 Mar 2017 10:26:48 +0900, Greg KH said: > On Tue, Mar 14, 2017 at 07:52:36PM -0600, Perry Hooker wrote: > > $ git checkout next-20170310 > > What am I doing wrong / where should I go for more info? > > linux-next is usually a day or so behind my tree, so maybe there were > other

Re: driver dev mailing lists

On Wed, 15 Mar 2017 11:58:52 +1100, "Tobin C. Harding" said: > What is the difference between these two mailing lists please? > > 1) de...@driverdev.osuosl.org > 2) de...@linuxdriverproject.org > > drivers/staging/ks7010/TODO asks for patches to be sent to > the second but

Re: Merging device drivers to LK tree

On Tue, 14 Mar 2017 21:59:20 +0100, Bjørn Mork said: > And another one: > > 5.) vendor independent class drivers > > > IMHO perfect for the independent developer since there will be > documentation available. The USB class specs are freely available for > example. Hmm... /sys/class has a bunch

Re: Merging device drivers to LK tree

On Tue, 14 Mar 2017 22:54:37 +0300, alexhoppus said: > No, I just try to understand the process. I don't fully understand what > is the role of independent developer in the process of submitting new > drivers to LK. What I mean is - hardware device vendors always ship > device driver with their

Re: Problem in First-Patch-Tutorial

On Mon, 13 Mar 2017 15:38:07 +0530, SIMRAN SINGHAL said: > >> # modinfo iio_dummy_evgen.ko > >> filename: > >> vermagic: 4.11.0-rc1+ SMP mod_unload modversions > >> > >> > >> $ uname -r > >> 4.10.0-rc3+ > Greg, I got that I have to build the module against the kernel I am using. > But,

Re: Problem in First-Patch-Tutorial

On Sun, 12 Mar 2017 15:49:31 +0200, Alexander Kapshuk said: > Are these drivers, drivers/iio/dummy/{iio_dummy_evgen,iio_dummy}.ko, > something of your own making, as I'm not seeing them in the kernel > source tree? > > The 'modules_install' make target installs drivers that have been > compiled

Re: cannot insmod sculld in ldd3

On Fri, 10 Mar 2017 20:19:29 +0330, Ali Aminian said: > these functions are defined in lddbus and i have insmod lddbus. > > can anyone tell me what is wrong. Unless I'm getting senile, neither sculld or lddbus are in the current mainline source tree, so you'll need to provide a pointer to your

Re: how to get filename of execve() system call from kernel module which install hook to syscall table to intercept original syscall in kernels before 4.2 and atter 4.2 ? X86_64

On Wed, 08 Mar 2017 15:20:57 +0300, Lev Olshvang said: > Hi Greg, >   > Thank you for a prompt reply. My intention is to build some euristics for > Intrusion detection of embedded based on sequence of syscalls. > I am collecting syscall events and send then with netlink to my monitor. > Since

Re: how to get filename of execve() system call from kernel module which install hook to syscall table to intercept original syscall in kernels before 4.2 and atter 4.2 ? X86_64

On Tue, 07 Mar 2017 20:22:33 +0100, Greg KH said: > On Mon, Mar 06, 2017 at 10:18:26AM +0300, Lev Olshvang wrote: > Why do you want to hook a syscall? that's a very complex, and broken, > and ill-advised thing to do. Please don't do that. > > What problem are you trying to solve here that led

Re: kernel development process question, patch review

On Tue, 21 Feb 2017 12:35:33 +1100, "Tobin C. Harding" said: > If a reviewer makes a suggestion and one intends on making the change > as suggested is it required (normal protocol) to reply stating that > the you understand their suggestion and intend on implementing it or > is this just noise.

Re: recovery from fail

On Mon, 13 Feb 2017 23:10:39 +, Andrey Utkin said: > On Mon, Feb 13, 2017 at 12:29:04PM +1100, Tobin Harding wrote: > > I don't want to make any more noise than I already have > > Not a big deal. > Don't worry about that unless you repeatedly receive strong suggestions > to never submit

Re: Why amdgpu pro does not work on kernel 4.10?

On Mon, 13 Feb 2017 05:26:50 +0330, Ali Aminian said: > Thank you for your response. > It does not work means: > 1_ I have downloaded amdgpu-pro driver from AMD website and installed it. Complain to AMD then, because.. > 2_ I have compiled linux kernel 4.10 and 4.9 with oldconfig. > error: too

Re: Why amdgpu pro does not work on kernel 4.10?

On Sun, 12 Feb 2017 17:45:58 +0330, Ali Aminian said: > I was heard that amdgpu pro is user space driver and the kernel space > part (amdgpu) is merged into Linux kernel. And that means amdgpu pro > should work on all kernels above 4.3. But why amdgpu pro does not work > on kernel 4.10? What do

Re: TCP as a module

On Tue, 15 Nov 2016 00:14:43 -0500, "Md. Islam" said: > I'm trying to write a Media-friendly TCP (by implementing a new > option). Please let me know if you have any suggestion. Step 0: Figure out what the new option is, and why you think it will be media-friendly. Hint: some 80% of internet

Re: TCP as a module

On Sat, 05 Nov 2016 21:10:19 -0400, "Md. Islam" said: > Currently TCP is statically linked to the kernel. How can I make it a > loadable module? I need to modify TCP (tcp_input.c and tcp_output.c). What problem are you trying to solve by modifying those two? There may be other approaches to do

Re: ip rule suppress_prefixlength

On Sun, 30 Oct 2016 12:25:50 +0100, Matthias Peter Walther said: > root@des1 ~ # ip rule > 0:from all lookup local > 32765:from all iif lo lookup ffnet suppress_prefixlength 0 > 32766:from all lookup main > 32767:from all lookup default > (ffnet is table 42) > root@des1 ~ # ip r s

Re: Device Tree

On Tue, 25 Oct 2016 15:46:05 +0530, Madhu K said: > You mean In non embedded system( laptop, desktop and server ) DT is not at > all required? Basically, that's correct. Those types of systems have already evolved ways (boot loaders, ACPI, and so on) to do things so there's no real need to use

Re: What subsystem!?

On Tue, 25 Oct 2016 10:33:47 -0200, "Daniel." said: > I've been studying linux for some time now. I still see my self as an > begginer, but that's not a bad thing. I struggling to decide what > subsystem to focus right know. I've said it before, and I'll say it again: If you have to ask others

Re: Device Tree

On Tue, 25 Oct 2016 11:51:38 +0530, Madhu K said: > If in case Device tree is not there, where and how to pass the hardware > information to the linux kernel. For many types of hardware, the bus protocol provides a standard way to find everything on the bus. And that sort of bus scanning is how

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