Hi all,
i have couple of questions
1. i have just copied and pasted the below data structure from net/snmp.h
struct ip_mib
{
unsigned long IpInReceives;
.
.
.
unsigned long __pad[0];
} ____cacheline_aligned;
in the above structure what is ___cacheline_aligned
is it just a variable of type struct udp_mib
if so why doesnt the compiler throw an error saying declaration of
___cacheline_aligned as it is seen in every structure defined in the file
net/snmp.h
if i try to copy and paste the structures in a userland program it throws
redeclaration of ___cacheline_aligned error.
2. if i use sizeof(struct ip_mib) from a kernel module it shows 96
but if i cut and paste the same data structure in a userland program the size
is shown as 68.I dont understand why.
I dont understand where i m wrong.please clarify.
thanks and regards,
mohan.
-
Kernelnewbies: Help each other learn about the Linux kernel.
Archive: http://mail.nl.linux.org/kernelnewbies/
IRC Channel: irc.openprojects.net / #kernelnewbies
Web Page: http://www.kernelnewbies.org/
