struct - What value will contain_of() return when two different integers are considered in a structure -

consider defined structure t

struct t { int a, b; };

if address of b 0x8b3000c , sizeof(int) 4. value container_of() return when invoked

container_of macro in linux kernel code, calculates address of container.

for ewxample, in case

struct t {     int a, b; };

applying container_of on address of b yield address of struct t

struct t *pt = container_of(ptr_b, struct t, b);

where ptr_b hold address of b, &b

normally, won't care physical value got, 0x8b3000c, work identifiers.

as interested in physical, both members int size 4, ignoring padding, pt have (ox8b3000c -4) = ox8b30008

but but, please never make such assumption while coding, struct may padded. use sizeof

Ben