#ifndef _ASM_GENERIC_LOCAL64_H
#define _ASM_GENERIC_LOCAL64_H

#include <linux/percpu.h>
#include <asm/types.h>

/*
 * A signed long type for operations which are atomic for a single CPU.
 * Usually used in combination with per-cpu variables.
 *
 * This is the default implementation, which uses atomic64_t.  Which is
 * rather pointless.  The whole point behind local64_t is that some processors
 * can perform atomic adds and subtracts in a manner which is atomic wrt IRQs
 * running on this CPU.  local64_t allows exploitation of such capabilities.
 */

/* Implement in terms of atomics. */

#if BITS_PER_LONG == 64

#include <asm/local.h>

typedef struct {
	local_t a;
} local64_t;

#define LOCAL64_INIT(i)	{ LOCAL_INIT(i) }

#define local64_read(l)		local_read(&(l)->a)
#define local64_set(l,i)	local_set((&(l)->a),(i))
#define local64_inc(l)		local_inc(&(l)->a)
#define local64_dec(l)		local_dec(&(l)->a)
#define local64_add(i,l)	local_add((i),(&(l)->a))
#define local64_sub(i,l)	local_sub((i),(&(l)->a))

#define local64_sub_and_test(i, l) local_sub_and_test((i), (&(l)->a))
#define local64_dec_and_test(l) local_dec_and_test(&(l)->a)
#define local64_inc_and_test(l) local_inc_and_test(&(l)->a)
#define local64_add_negative(i, l) local_add_negative((i), (&(l)->a))
#define local64_add_return(i, l) local_add_return((i), (&(l)->a))
#define local64_sub_return(i, l) local_sub_return((i), (&(l)->a))
#define local64_inc_return(l)	local_inc_return(&(l)->a)

#define local64_cmpxchg(l, o, n) local_cmpxchg((&(l)->a), (o), (n))
#define local64_xchg(l, n)	local_xchg((&(l)->a), (n))
#define local64_add_unless(l, _a, u) local_add_unless((&(l)->a), (_a), (u))
#define local64_inc_not_zero(l)	local_inc_not_zero(&(l)->a)

/* Non-atomic variants, ie. preemption disabled and won't be touched
 * in interrupt, etc.  Some archs can optimize this case well. */
#define __local64_inc(l)	local64_set((l), local64_read(l) + 1)
#define __local64_dec(l)	local64_set((l), local64_read(l) - 1)
#define __local64_add(i,l)	local64_set((l), local64_read(l) + (i))
#define __local64_sub(i,l)	local64_set((l), local64_read(l) - (i))

#else /* BITS_PER_LONG != 64 */

#include <linux/atomic.h>

/* Don't use typedef: don't want them to be mixed with atomic_t's. */
typedef struct {
	atomic64_t a;
} local64_t;

#define LOCAL64_INIT(i)	{ ATOMIC_LONG_INIT(i) }

#define local64_read(l)		atomic64_read(&(l)->a)
#define local64_set(l,i)	atomic64_set((&(l)->a),(i))
#define local64_inc(l)		atomic64_inc(&(l)->a)
#define local64_dec(l)		atomic64_dec(&(l)->a)
#define local64_add(i,l)	atomic64_add((i),(&(l)->a))
#define local64_sub(i,l)	atomic64_sub((i),(&(l)->a))

#define local64_sub_and_test(i, l) atomic64_sub_and_test((i), (&(l)->a))
#define local64_dec_and_test(l) atomic64_dec_and_test(&(l)->a)
#define local64_inc_and_test(l) atomic64_inc_and_test(&(l)->a)
#define local64_add_negative(i, l) atomic64_add_negative((i), (&(l)->a))
#define local64_add_return(i, l) atomic64_add_return((i), (&(l)->a))
#define local64_sub_return(i, l) atomic64_sub_return((i), (&(l)->a))
#define local64_inc_return(l)	atomic64_inc_return(&(l)->a)

#define local64_cmpxchg(l, o, n) atomic64_cmpxchg((&(l)->a), (o), (n))
#define local64_xchg(l, n)	atomic64_xchg((&(l)->a), (n))
#define local64_add_unless(l, _a, u) atomic64_add_unless((&(l)->a), (_a), (u))
#define local64_inc_not_zero(l)	atomic64_inc_not_zero(&(l)->a)

/* Non-atomic variants, ie. preemption disabled and won't be touched
 * in interrupt, etc.  Some archs can optimize this case well. */
#define __local64_inc(l)	local64_set((l), local64_read(l) + 1)
#define __local64_dec(l)	local64_set((l), local64_read(l) - 1)
#define __local64_add(i,l)	local64_set((l), local64_read(l) + (i))
#define __local64_sub(i,l)	local64_set((l), local64_read(l) - (i))

#endif /* BITS_PER_LONG != 64 */

#endif /* _ASM_GENERIC_LOCAL64_H */
d><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
Currently, the ip_vs_dest cache frees ip_vs_dest objects when their
reference count becomes &lt; 0.  Aside from not being semantically sound,
this is problematic for the new type refcount_t, which will be introduced
shortly in a separate patch. refcount_t is the new kernel type for
holding reference counts, and provides overflow protection and a
constrained interface relative to atomic_t (the type currently being
used for kernel reference counts).

Per Julian Anastasov: "The problem is that dest_trash currently holds
deleted dests (unlinked from RCU lists) with refcnt=0."  Changing
dest_trash to hold dest with refcnt=1 will allow us to free ip_vs_dest
structs when their refcnt=0, in ip_vs_dest_put_and_free().

Signed-off-by: David Windsor &lt;dwindsor@gmail.com&gt;
Signed-off-by: Julian Anastasov &lt;ja@ssi.bg&gt;
Signed-off-by: Simon Horman &lt;horms@verge.net.au&gt;
Signed-off-by: Pablo Neira Ayuso &lt;pablo@netfilter.org&gt;


</td></tr>
<tr class='logheader'><td><span title='2017-02-02 14:31:54 +0100'>2017-02-02</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/ip_vs.h?id=c74454fadd5ea6fc866ffe2c417a0dba56b2bf1c'>netfilter: add and use nf_ct_set helper</a></td><td>Florian Westphal</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+1</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
Add a helper to assign a nf_conn entry and the ctinfo bits to an sk_buff.
This avoids changing code in followup patch that merges skb-&gt;nfct and
skb-&gt;nfctinfo into skb-&gt;_nfct.

Signed-off-by: Florian Westphal &lt;fw@strlen.de&gt;
Signed-off-by: Pablo Neira Ayuso &lt;pablo@netfilter.org&gt;


</td></tr>
<tr class='logheader'><td><span title='2017-02-02 14:31:52 +0100'>2017-02-02</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/ip_vs.h?id=97a6ad13decc16c5adbf181283932daba7e17faf'>netfilter: reduce direct skb-&gt;nfct usage</a></td><td>Florian Westphal</td><td>1</td><td><span class='deletions'>-3</span>/<span class='insertions'>+6</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
Next patch makes direct skb-&gt;nfct access illegal, reduce noise
in next patch by using accessors we already have.

Signed-off-by: Florian Westphal &lt;fw@strlen.de&gt;
Signed-off-by: Pablo Neira Ayuso &lt;pablo@netfilter.org&gt;


</td></tr>