why use memcpy when memmove is there?

[sk malik]

Hi, All

We were looking at  "[kernel]/lib/string.c"
(http://lxr.linux.no/source/lib/string.c#L500)

memcpy copies a part of memory to some other location
but It will not work for all cases of overlapping
blocks.(if the start of destination block falls
between the source block)

while memove copes with overlapping areas.

then why is memcpy present in the sources can't we
simply do

"#define memcpy memmove" in include/linux/string.h

or am I missing something?

Regards
Sri



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Boot hangs on IBM T60

[sk malik]

Hi, all

It happens very rarely that the system hangs while
booting.

The last message on console is :

Activating device mapper..

I dont' get any oops and the system works without any
problem if it boots. :)

uname -a gives
 2.6.18.8-0.5-default #1 SMP Fri Jun 22 12:17:53 UTC
2007 i686 i686 i386 GNU/Linux

Let me know if you need more information, with the
steps to generate that info. :)

I am pasting a few lines which fall above and below
the mapper activation as shown by dmesg for a
successful boot.

Thanks 
Sri 

Yenta: ISA IRQ mask 0x0cf0, PCI irq 169
Socket status: 3007
pcmcia: parent PCI bridge I/O window: 0xa000 - 0xdfff
cs: IO port probe 0xa000-0xdfff: clean.
pcmcia: parent PCI bridge Memory window: 0xe430 -
0xe7ff
pcmcia: parent PCI bridge Memory window: 0xe000 -
0xe3ff
ACPI: PCI Interrupt :03:00.0[A] -> GSI 17 (level,
low) -> IRQ 82
PCI: Setting latency timer of device :03:00.0 to
64
ACPI: PCI Interrupt :00:1b.0[B] -> GSI 17 (level,
low) -> IRQ 82
PCI: Setting latency timer of device :00:1b.0 to
64
ipw3945: Detected Intel PRO/Wireless 3945ABG Network
Connection
cs: IO port probe 0x100-0x3af: clean.
cs: IO port probe 0x3e0-0x4ff: excluding 0x4d0-0x4d7
cs: IO port probe 0x820-0x8ff: clean.
cs: IO port probe 0xc00-0xcf7: clean.
cs: IO port probe 0xa00-0xaff: clean.
ipw3945: Radio Frequency Kill Switch is On:
Kill switch must be turned off for wireless networking
to work.
Adding 1004020k swap on /dev/sda7.  Priority:-1
extents:1 across:1004020k
##Here I get the "activating device mapper" on
console## 
device-mapper: ioctl: 4.7.0-ioctl (2006-06-24)
initialised: [EMAIL PROTECTED]
loop: loaded (max 8 devices)
ReiserFS: sda6: found reiserfs format "3.6" with
standard journal
ReiserFS: sda6: using ordered data mode
reiserfs: using flush barriers
ReiserFS: sda6: journal params: device sda6, size
8192, journal first block 18, max trans len 1024, max
batch 900, max commit age 30, max trans age 30
ReiserFS: sda6: checking transaction log (sda6)
ReiserFS: sda6: Using r5 hash to sort names
NTFS driver 2.1.27 [Flags: R/W MODULE].
NTFS volume version 3.1.
ACPI: AC Adapter [AC] (off-line)
ACPI: Battery Slot [BAT0] (battery present)
ACPI: Power Button (FF) [PWRF]
ACPI: Lid Switch [LID]
ACPI: Sleep Button (CM) [SLPB]




Jats do it



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