Good evening,
i read the article about the container_of function:
http://www.kroah.com/log/linux/container_of.html
I understand what it does and how it works.
I thought, it could be simplified by replacing it through this:
#define container_of(ptr, type, member) ({ \
(type *)( (char *)ptr - offsetof(type,member) );})
Original:
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr);
(type *)( (char *)__mptr - offsetof(type,member) );})
ptr has the type of a pointer to the member, which should be the same
as __mptr? The value should although be the same.
First I tried it in a self written script, then replaced it in
include/linux/kernel.h and compiled it as usermode linux -> working
well.
Then I compiled it and run it in a VM, but it is not working.
Can you please explain to me, why the original version is always working
and "mine" is not?
Thank you for your time!
Regards,
Simon
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