Hi, folks!
Nice to get to know this email list. I hope I finally arrived to the right
group.
( I posted my question on stackoverflow 2 weeks ago but there's no reply. I'm
analyzing the console-related code, it's too complex..)
I'm trying to bring up virtual terminal on our embedded system's
On Wed, Feb 26, 2014 at 11:16 AM, Rohan Puri rohan.pur...@gmail.com wrote:
On Wed, Feb 26, 2014 at 1:08 AM, Abhishek Dave cfsxd...@gmail.com wrote:
Hello All,
Can some one please help me to understand meaning of below code
snip
if (!list_empty(sb-s_inodes)) {
406
Hi, I am writing a driver module. Now I have some questions about blocked I/O.
my_read() is the read function in the file_operations struct in my
module. my_read() is just as simple as this:
ssize_t my_read()
{
if(wait_event_interruptible(dev-queue, a == b))
return -ERESTARTSYS;
I am using 'pr_debug()' to print debug statements. But I don't see
anything in my serial console. But when I use pr_info(), I see the
debug statements.
Do I need to do anything to see pr_debug()?
Thank you.
___
Kernelnewbies mailing list
On Wed, Feb 26, 2014 at 11:35:23AM -0800, m silverstri wrote:
I am using 'pr_debug()' to print debug statements. But I don't see
anything in my serial console. But when I use pr_info(), I see the
debug statements.
Do I need to do anything to see pr_debug()?
add this to the top of the file
It seems this task landscape-sysin is trying to peek into virtual memory
of your processes and the process within mmap call is holding its
mm-mmap_sem semaphore which grants access to its address space.
landscape-sysin is trying to grab this semaphore to poke into address space
of your mmap
Hi All,
I am facing an kernel restart due to emergency remount. Could anybody tell
me general techniques to go head with the debugging?
Below are the logs which are seen during a reboot.
[ 425.832395,1] SysRq : Emergency Remount R/O
[ 425.876210,1] EXT4-fs (mmcblk0p36): re-mounted. Opts: (null)
Hi,
a new standard not yet supported under Linux but starting to penetrate
the market is IPP-over-USB (Internet Printing Protocol over USB).
IPP, the Internet Printing Protocol from the Printing Working Group
(PWG, http://www.pwg.org/) is a standard protocol for network printers
(and also used
Till,
Some comments inline...
On Feb 25, 2014, at 12:01 PM, Till Kamppeter till.kamppe...@gmail.com wrote:
Hi,
a new standard not yet supported under Linux but starting to penetrate
the market is IPP-over-USB (Internet Printing Protocol over USB).
...
Fortunately, the PWG has added a
On 02/25/2014 06:20 PM, Linus Torvalds wrote:
On Tue, Feb 25, 2014 at 9:01 AM, Till Kamppeter
till.kamppe...@gmail.com wrote:
First, I want to make a feature request to the kernel to add it. Second,
I want to suggest this as a Google Summer of Code project, asking for
mentors on the kernel
On Tue, Feb 25, 2014 at 01:42:00PM -0500, Michael Sweet wrote:
Till,
Some comments inline...
On Feb 25, 2014, at 12:01 PM, Till Kamppeter till.kamppe...@gmail.com wrote:
Hi,
a new standard not yet supported under Linux but starting to penetrate
the market is IPP-over-USB (Internet
Greg,
On Feb 25, 2014, at 8:47 PM, Greg KH g...@kroah.com wrote:
...
So you want to do this as a userspace library talking directly to the
USB device through usbfs/libusb? Or should the kernel provide a basic
pipe-like functionality to the hardware to make it easier for things
to be queued
I have posted this project on our project ideas list now:
https://www.linuxfoundation.org/collaborate/workgroups/gsoc/google-summer-code-2014
Feel free to do corrections on the posting.
I have also announced our participation in the GSoC on our front page:
On Wed, 26 Feb 2014 11:35:23 -0800, m silverstri said:
I am using 'pr_debug()' to print debug statements. But I don't see
anything in my serial console. But when I use pr_info(), I see the
debug statements.
Do I need to do anything to see pr_debug()?
You probably need a #define DEBUG. Also,
On Tue, 25 Feb 2014 18:01:07 +0100, Till Kamppeter said:
all non-Windows operating systems). IPP network printers have a lot of
advantages compared to USB printers (letting the ability of several
computers on a network being able to access them aside):
- Encrypted job transfer
I'll merely
Hi guys,
I am working on a hack which requires me to find all the processes
using a particular memory address. Lets say I get an MCE error
containing a memory address. I want to use this address to find all
the processes that might access it, and kill them before they do.
Please let me know if
On Tue, Feb 25, 2014 at 08:56:23PM -0500, Michael Sweet wrote:
Greg,
On Feb 25, 2014, at 8:47 PM, Greg KH g...@kroah.com wrote:
...
So you want to do this as a userspace library talking directly to the
USB device through usbfs/libusb? Or should the kernel provide a basic
pipe-like
Greg,
We already unload the usblp driver - it isn't compatible with most of the
multifunction printers out there today...
On Feb 26, 2014, at 6:02 PM, Greg KH g...@kroah.com wrote:
On Tue, Feb 25, 2014 at 08:56:23PM -0500, Michael Sweet wrote:
Greg,
On Feb 25, 2014, at 8:47 PM, Greg KH
Yes, if you add line below,
console_loglevel = 8; // 8 is debug level
The debug messages will also be printed to your console (serial port).
maybe you could revert it back after use.
Chan
From : valdis.kletni...@vt.edu valdis.kletni...@vt.edu
Sent : 2014-02-27
Yes, if you add a line below,
console_loglevel = 8; // 8 is debug level
The debug messages will also be printed to your console (serial port).
(Maybe this also goes to /var/log/debug ?)
you could revert it back after use.
Chan
From : valdis.kletni...@vt.edu
On Wed, 26 Feb 2014 14:52:09 -0800, Sandeep K Chaudhary said:
I am working on a hack which requires me to find all the processes
using a particular memory address. Lets say I get an MCE error
containing a memory address. I want to use this address to find all
the processes that might access
Why do you need to block in mmap()? mmap is supposed to create a mapping
area in virtual address space for the process. Actual transfer happens
later through page fault handlers on demand basis. look at vm_operations
fault/readpage etc methods, these might be the places you want to wait for
the
OK, I will look into this. Is it OK to block vm_fault?
I have another question. In my userspace program, I mmap() my device, then
read something, then munmap() my device() and then mmap() my device again.
The program do this in a loop. Everytime it mmap() the same address and
offset.
My device
On Wed, 26 Feb 2014 17:19:49 -0800, Sandeep K Chaudhary said:
You mean like this in-tree code?
config MEMORY_FAILURE
depends on MMU
depends on ARCH_SUPPORTS_MEMORY_FAILURE
bool Enable recovery from hardware memory errors
select MEMORY_ISOLATION
Check for two things:
1. Handle error from mmap() call in user space, it seems munmap is called
unconditionally.
while(1) {
str = mmap(vma); //always map the same address and offset
(they are set to zero), logger will handle this
fwrite(str, 4096, fd);
munmap(str);
}
2.
On Wed, Feb 19, 2014 at 6:14 PM, Priyaranjan Das
priyaranjan456...@gmail.com wrote:
Hi All,
I am facing an kernel restart due to emergency remount. Could anybody tell
me general techniques to go head with the debugging?
Below are the logs which are seen during a reboot.
[ 425.832395,1]
Hi Priyaranjan,
On Wed, Feb 19, 2014 at 6:14 PM, Priyaranjan Das
priyaranjan456...@gmail.com wrote:
Hi All,
I am facing an kernel restart due to emergency remount. Could anybody tell me
general techniques to go head with the debugging?
Below are the logs which are seen during a reboot.
On Thu, 27 Feb 2014 09:43:35 +0530, Arun KS said:
[ 425.832395,1] SysRq : Emergency Remount R/O
This looks like be a sys request from user space.
Application can write echo u /proc/sysrq-trigger to trigger an
emergency remount.
You can hack drivers/tty/sysrq.c to print current task(to
Hi ,
The link
https://www.kernel.org/doc/Documentation/networking/packet_mmap.txt
talks about achieving zero copy. But i find a deep packet copy ( of
length snaplen= skb-len ) here
http://lxr.free-electrons.com/source/net/packet/af_packet.c#L1841.
Is there anything missing/wrong in my
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