What is the significance of access_ok macro ? I see that it's defined in
linux-2.6.34/include/asm-generic/uaccess.h as :
#define access_ok(type, addr, size) __access_ok((unsigned
long)(addr),(size))#define access_ok(type, addr, size) __access_ok((unsigned
long)(addr),(size))
/*
* The
Hi Onkar...
On Sun, Oct 10, 2010 at 14:47, Onkar Mahajan kern.de...@gmail.com wrote:
What is the significance of access_ok macro ? I see that it's defined in
linux-2.6.34/include/asm-generic/uaccess.h as :
I vaguely recall, it is used in places like copy_from_user. The macro
check whether the
Hi,
Is there any means to read TLB entries ?
I don't think you can do it on x86. TLB (for x86) is done completely
in hardware.. The only thing sw. can do is invalidate entries. Check
out the x86 System Programming Guide part 1, chapter 4.10. This
approach is different on MIPS, SPARC, PPC where
#ifdef __CHECKER__
# define __user__attribute__((noderef, address_space(1)))
# define __kernel__attribute__((address_space(0)))
# define __safe__attribute__((safe))
# define __force__attribute__((force))
# define __nocast__attribute__((nocast))
# define __iomem
Hi Onkar,
i hope this may help u (as Mulyadi also explained)
* access_ok: - Checks if a user space pointer is valid
63 * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that
64 *%VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
65 *to write to a
On Sun, 10 Oct 2010 08:29:52 +0700, Mulyadi Santosa mulyadi.sant...@gmail.com
wrote:
On Sat, Oct 9, 2010 at 14:46, Ali Polatel a...@exherbo.org wrote:
Hi everyone,
I want to write laptop extras for my laptop¹ so that changing brightness
of the screen etc. are supported by Linux.
I am
On Fri, Oct 8, 2010 at 4:32 AM, gaurav mahajan
gauravmahajan2...@gmail.com wrote:
Hi,
I'm new to kernel coding and I have this doubt. I'm trying to write a
simple dm-target which will concatenate devices and perform io
operations on it.
That seems like the normal LVM2 functionality.
You
Hi Ali...
On Sun, Oct 10, 2010 at 23:09, Ali Polatel a...@exherbo.org wrote:
Well xbacklight doesn't work at all on this box:
$ xbacklight
No outputs have backlight property
Great :(
Well, perhaps the first thing you need to do is see the complete
output of lshw and then discuss it with
Dear all:
I am so SORRY that I send the mail before I finish it, since I finger
flip over the send button.
SORRY~~~
i write a simple program as below to count the speed of writing a file
over usb, gettimeofday before writing and gettimeofday when finish
writing. but I found something make me
On 10/10/2010 08:33 AM, Dragos Tatulea wrote:
Is there any means to read TLB entries ?
I don't think you can do it on x86. TLB (for x86) is done completely
in hardware..
Even if you theoretically could, the act of calling
a hypothetical TLB reading function would cause
mappings of other code
On Sun, Oct 10, 2010 at 5:51 AM, Onkar Mahajan kern.de...@gmail.com wrote:
#ifdef __CHECKER__
# define __user __attribute__((noderef, address_space(1)))
# define __kernel __attribute__((address_space(0)))
# define __safe __attribute__((safe))
# define __force
On Mon, Oct 11, 2010 at 04:33, Rik van Riel r...@surriel.com wrote:
On 10/10/2010 08:33 AM, Dragos Tatulea wrote:
Even if you theoretically could, the act of calling
a hypothetical TLB reading function would cause
mappings of other code to be evicted from the
TLB :)
Rik, you always surprise
Then, what is the interface specification to which both Linux and Grub
comply to.
How does Grub load the linux kernel to the memory and initiate execution of
the Kernel code.
Thanks,
Prabhu
On Wed, Oct 6, 2010 at 9:08 PM, Philip Downer p...@pjd.me.uk wrote:
Prabhu nath wrote:
I
Hi All,
I have installed WinXp (32 Bit), Windows 7 (64 Bit) and Ubuntu (10.4) on my
Pentium i5 machine. My monitor is
Dell 2010M flat 20 inch wide screen.
When I boot Ubuntu I dont see the classic messages I used to see something
like below:
Starting Crond [OK]
Starting Keboard [FAILED]
Has
Yes please. Nice to have your say on this.
Thanks,
Prabhu
On Mon, Oct 11, 2010 at 9:37 AM, Mulyadi Santosa
mulyadi.sant...@gmail.comwrote:
On Mon, Oct 11, 2010 at 04:33, Rik van Riel r...@surriel.com wrote:
On 10/10/2010 08:33 AM, Dragos Tatulea wrote:
Even if you theoretically could,
Hi.
On Mon, Oct 11, 2010 at 11:18, Rags Linux linux.r...@gmail.com wrote:
Hi All,
I have installed WinXp (32 Bit), Windows 7 (64 Bit) and Ubuntu (10.4) on my
Pentium i5 machine. My monitor is
Dell 2010M flat 20 inch wide screen.
No offense, but try to think: by saying your monitor
Hi
On Mon, Oct 11, 2010 at 11:30, Prabhu nath gprabhun...@gmail.com wrote:
Yes please. Nice to have your say on this.
Please don't top post :)
First, do you know what TLB is? It caches latest address translation,
correct? Thus, by doing the function call, it is likely that new
virtual address
Hi,
Thanks... U mean to say I have to try other consoles? F3, F4, etc?
Now, If I build my new Kernel and boot that Kernel, What all features I
would get?
What all features are part of the Kernel?
Thanks and Regards,
Raghunand.
On Mon, Oct 11, 2010 at 10:02 AM, Mulyadi Santosa
On Mon, Oct 11, 2010 at 12:18 AM, Rags Linux linux.r...@gmail.com wrote:
Hi All,
I have installed WinXp (32 Bit), Windows 7 (64 Bit) and Ubuntu (10.4) on my
Pentium i5 machine. My monitor is
Dell 2010M flat 20 inch wide screen.
When I boot Ubuntu I dont see the classic messages I used to
Thanks John. Yea sorry its Ctrl + Alt and not Ctrl + Shift. However,
This ain't working for me. My monitor goes blank and goes to sleep mode as
though
the monitor is switched off.
Thanks and Regards,
Raghunand.
On Mon, Oct 11, 2010 at 10:43 AM, John Mahoney jmaho...@waav.com wrote:
On Mon,
Hi,
how can I get the free memory in Linux? I am not quite sure but I am
looking at the MemFree, Buffers and Cached fields in /proc/meminfo. They
should give me the actual free memory. I am having embedded system
without swap and I have conditions when Buffers go to zero. The system
seems to
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