6 files changed, 48 insertions, 17 deletions
diff --git a/include/asm-alpha/barrier.h b/include/asm-alpha/barrier.h
index 384dc08d6f5..ac78eba909b 100644
--- a/include/asm-alpha/barrier.h
+++ b/include/asm-alpha/barrier.h
@@ -24,7 +24,7 @@ __asm__ __volatile__("mb": : :"memory")
 #define smp_mb()	barrier()
 #define smp_rmb()	barrier()
 #define smp_wmb()	barrier()
-#define smp_read_barrier_depends()	barrier()
+#define smp_read_barrier_depends()	do { } while (0)
 #endif
 
 #define set_mb(var, value) \
diff --git a/include/asm-alpha/pgtable.h b/include/asm-alpha/pgtable.h
index 05ce5fba43e..3f0c59f6d8a 100644
--- a/include/asm-alpha/pgtable.h
+++ b/include/asm-alpha/pgtable.h
@@ -287,17 +287,34 @@ extern inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }
 #define pgd_index(address)	(((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
 #define pgd_offset(mm, address)	((mm)->pgd+pgd_index(address))
 
+/*
+ * The smp_read_barrier_depends() in the following functions are required to
+ * order the load of *dir (the pointer in the top level page table) with any
+ * subsequent load of the returned pmd_t *ret (ret is data dependent on *dir).
+ *
+ * If this ordering is not enforced, the CPU might load an older value of
+ * *ret, which may be uninitialized data. See mm/memory.c:__pte_alloc for
+ * more details.
+ *
+ * Note that we never change the mm->pgd pointer after the task is running, so
+ * pgd_offset does not require such a barrier.
+ */
+
 /* Find an entry in the second-level page table.. */
 extern inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
 {
-	return (pmd_t *) pgd_page_vaddr(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1));
+	pmd_t *ret = (pmd_t *) pgd_page_vaddr(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1));
+	smp_read_barrier_depends(); /* see above */
+	return ret;
 }
 
 /* Find an entry in the third-level page table.. */
 extern inline pte_t * pte_offset_kernel(pmd_t * dir, unsigned long address)
 {
-	return (pte_t *) pmd_page_vaddr(*dir)
+	pte_t *ret = (pte_t *) pmd_page_vaddr(*dir)
 		+ ((address >> PAGE_SHIFT) & (PTRS_PER_PAGE - 1));
+	smp_read_barrier_depends(); /* see above */
+	return ret;
 }
 
 #define pte_offset_map(dir,addr)	pte_offset_kernel((dir),(addr))
diff --git a/include/asm-frv/system.h b/include/asm-frv/system.h
index cb307f8a6b4..d3a12a9079f 100644
--- a/include/asm-frv/system.h
+++ b/include/asm-frv/system.h
@@ -179,7 +179,7 @@ do {							\
 #define mb()			asm volatile ("membar" : : :"memory")
 #define rmb()			asm volatile ("membar" : : :"memory")
 #define wmb()			asm volatile ("membar" : : :"memory")
-#define read_barrier_depends()	barrier()
+#define read_barrier_depends()	do { } while (0)
 
 #ifdef CONFIG_SMP
 #define smp_mb()			mb()
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 7c1d4466583..b11e6e19e96 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -93,14 +93,16 @@ struct wireless_dev;
  *	used.
  */
  
-#if !defined(CONFIG_AX25) && !defined(CONFIG_AX25_MODULE) && !defined(CONFIG_TR)
-#define LL_MAX_HEADER	32
+#if defined(CONFIG_WLAN_80211) || defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
+# if defined(CONFIG_MAC80211_MESH)
+#  define LL_MAX_HEADER 128
+# else
+#  define LL_MAX_HEADER 96
+# endif
+#elif defined(CONFIG_TR)
+# define LL_MAX_HEADER 48
 #else
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
-#define LL_MAX_HEADER	96
-#else
-#define LL_MAX_HEADER	48
-#endif
+# define LL_MAX_HEADER 32
 #endif
 
 #if !defined(CONFIG_NET_IPIP) && !defined(CONFIG_NET_IPIP_MODULE) && \
@@ -244,11 +246,16 @@ struct hh_cache
  *
  * We could use other alignment values, but we must maintain the
  * relationship HH alignment <= LL alignment.
+ *
+ * LL_ALLOCATED_SPACE also takes into account the tailroom the device
+ * may need.
  */
 #define LL_RESERVED_SPACE(dev) \
-	(((dev)->hard_header_len&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
+	((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
-	((((dev)->hard_header_len+extra)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
+	((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
+#define LL_ALLOCATED_SPACE(dev) \
+	((((dev)->hard_header_len+(dev)->needed_headroom+(dev)->needed_tailroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
 
 struct header_ops {
 	int	(*create) (struct sk_buff *skb, struct net_device *dev,
@@ -567,6 +574,13 @@ struct net_device
 	unsigned short		type;	/* interface hardware type	*/
 	unsigned short		hard_header_len;	/* hardware hdr length	*/
 
+	/* extra head- and tailroom the hardware may need, but not in all cases
+	 * can this be guaranteed, especially tailroom. Some cases also use
+	 * LL_MAX_HEADER instead to allocate the skb.
+	 */
+	unsigned short		needed_headroom;
+	unsigned short		needed_tailroom;
+
 	struct net_device	*master; /* Pointer to master device of a group,
 					  * which this device is member of.
 					  */
@@ -715,6 +729,9 @@ struct net_device
 	struct net		*nd_net;
 #endif
 
+	/* mid-layer private */
+	void			*ml_priv;
+
 	/* bridge stuff */
 	struct net_bridge_port	*br_port;
 	/* macvlan */
diff --git a/include/net/irda/discovery.h b/include/net/irda/discovery.h
index e4efad1f9ef..0ce93398720 100644
--- a/include/net/irda/discovery.h
+++ b/include/net/irda/discovery.h
@@ -57,9 +57,6 @@ typedef union {
 	__u8  byte[2];
 } __u16_host_order;
 
-/* Same purpose, different application */
-#define u16ho(array) (* ((__u16 *) array))
-
 /* Types of discovery */
 typedef enum {
 	DISCOVERY_LOG,		/* What's in our discovery log */
diff --git a/include/net/syncppp.h b/include/net/syncppp.h
index 877efa43470..e43f4070d89 100644
--- a/include/net/syncppp.h
+++ b/include/net/syncppp.h
@@ -59,7 +59,7 @@ struct ppp_device
 
 static inline struct sppp *sppp_of(struct net_device *dev) 
 {
-	struct ppp_device **ppp = dev->priv;
+	struct ppp_device **ppp = dev->ml_priv;
 	BUG_ON((*ppp)->dev != dev);
 	return &(*ppp)->sppp;
 }