187f1882b5
If a header file is making use of BUG, BUG_ON, BUILD_BUG_ON, or any other BUG variant in a static inline (i.e. not in a #define) then that header really should be including <linux/bug.h> and not just expecting it to be implicitly present. We can make this change risk-free, since if the files using these headers didn't have exposure to linux/bug.h already, they would have been causing compile failures/warnings. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
/*
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* generic net pointers
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*/
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#ifndef __NET_GENERIC_H__
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#define __NET_GENERIC_H__
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#include <linux/bug.h>
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#include <linux/rcupdate.h>
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/*
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* Generic net pointers are to be used by modules to put some private
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* stuff on the struct net without explicit struct net modification
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*
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* The rules are simple:
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* 1. set pernet_operations->id. After register_pernet_device you
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* will have the id of your private pointer.
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* 2. set pernet_operations->size to have the code allocate and free
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* a private structure pointed to from struct net.
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* 3. do not change this pointer while the net is alive;
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* 4. do not try to have any private reference on the net_generic object.
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*
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* After accomplishing all of the above, the private pointer can be
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* accessed with the net_generic() call.
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*/
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struct net_generic {
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unsigned int len;
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struct rcu_head rcu;
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void *ptr[0];
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};
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static inline void *net_generic(const struct net *net, int id)
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{
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struct net_generic *ng;
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void *ptr;
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rcu_read_lock();
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ng = rcu_dereference(net->gen);
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BUG_ON(id == 0 || id > ng->len);
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ptr = ng->ptr[id - 1];
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rcu_read_unlock();
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BUG_ON(!ptr);
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return ptr;
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}
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#endif
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