Hi,
I'm completely new in kernel things, so forgive me if
sometimes I will have stupid questions.
So, to the point. The questions:
1. What is the __mptr needed for?
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
2. Why is the "{ }" needed?
#define __pgd(x) ((pgd_t) { (x) } )
3. What are data_len and len in sk_buff, how are they used?
4. What is the difference between frag_list and frags[]?
struct skb_shared_info {
atomic_t dataref;
unsigned int nr_frags;
unsigned short tso_size;
unsigned short tso_segs;
struct sk_buff *frag_list;
skb_frag_t frags[MAX_SKB_FRAGS];
};
Thanks in advance,
Gabor
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