> On Jan 17, 2015, at 8:32 AM, Simon Brand <simon.brand@xxxxxxxxxxxxxxxx> wrote: > > 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. What do you mean by that? What 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 > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
