8 files changed, 40 insertions, 3 deletions

diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index b97cdc516a8f..106c3ba50844 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -52,6 +52,7 @@ header-y += const.h
 header-y += cgroupstats.h
 header-y += cramfs_fs.h
 header-y += cycx_cfm.h
+header-y += dcbnl.h
 header-y += dlmconstants.h
 header-y += dlm_device.h
 header-y += dlm_netlink.h
diff --git a/include/linux/dcbnl.h b/include/linux/dcbnl.h
index b0ef274e0031..7d2e10006188 100644
--- a/include/linux/dcbnl.h
+++ b/include/linux/dcbnl.h
@@ -20,10 +20,12 @@
 #ifndef __LINUX_DCBNL_H__
 #define __LINUX_DCBNL_H__
 
+#include <linux/types.h>
+
 #define DCB_PROTO_VERSION 1
 
 struct dcbmsg {
-        unsigned char      dcb_family;
+        __u8               dcb_family;
         __u8               cmd;
         __u16              dcb_pad;
 };
diff --git a/include/linux/io-mapping.h b/include/linux/io-mapping.h
index cbc2f0cd631b..0adb0f91568c 100644
--- a/include/linux/io-mapping.h
+++ b/include/linux/io-mapping.h
@@ -91,8 +91,11 @@ io_mapping_unmap_atomic(void *vaddr)
 static inline void *
 io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset)
 {
+        resource_size_t phys_addr;
+
         BUG_ON(offset >= mapping->size);
-        resource_size_t phys_addr = mapping->base + offset;
+        phys_addr = mapping->base + offset;
+
         return ioremap_wc(phys_addr, PAGE_SIZE);
 }
 
diff --git a/include/linux/netfilter/xt_NFLOG.h b/include/linux/netfilter/xt_NFLOG.h
index cdcd0ed58f7a..4b36aeb46a10 100644
--- a/include/linux/netfilter/xt_NFLOG.h
+++ b/include/linux/netfilter/xt_NFLOG.h
@@ -2,7 +2,7 @@
 #define _XT_NFLOG_TARGET
 
 #define XT_NFLOG_DEFAULT_GROUP          0x1
-#define XT_NFLOG_DEFAULT_THRESHOLD      1
+#define XT_NFLOG_DEFAULT_THRESHOLD      0
 
 #define XT_NFLOG_MASK                   0x0
 
diff --git a/include/linux/rcuclassic.h b/include/linux/rcuclassic.h
index f3f697df1d71..80044a4f3ab9 100644
--- a/include/linux/rcuclassic.h
+++ b/include/linux/rcuclassic.h
@@ -181,4 +181,10 @@ extern long rcu_batches_completed_bh(void);
 #define rcu_enter_nohz()        do { } while (0)
 #define rcu_exit_nohz()         do { } while (0)
 
+/* A context switch is a grace period for rcuclassic. */
+static inline int rcu_blocking_is_gp(void)
+{
+        return num_online_cpus() == 1;
+}
+
 #endif /* __LINUX_RCUCLASSIC_H */
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 921340a7b71c..528343e6da51 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -52,6 +52,9 @@ struct rcu_head {
         void (*func)(struct rcu_head *head);
 };
 
+/* Internal to kernel, but needed by rcupreempt.h. */
+extern int rcu_scheduler_active;
+
 #if defined(CONFIG_CLASSIC_RCU)
 #include <linux/rcuclassic.h>
 #elif defined(CONFIG_TREE_RCU)
@@ -265,6 +268,7 @@ extern void rcu_barrier_sched(void);
 
 /* Internal to kernel */
 extern void rcu_init(void);
+extern void rcu_scheduler_starting(void);
 extern int rcu_needs_cpu(int cpu);
 
 #endif /* __LINUX_RCUPDATE_H */
diff --git a/include/linux/rcupreempt.h b/include/linux/rcupreempt.h
index 3e05c09b54a2..74304b4538d8 100644
--- a/include/linux/rcupreempt.h
+++ b/include/linux/rcupreempt.h
@@ -142,4 +142,19 @@ static inline void rcu_exit_nohz(void)
 #define rcu_exit_nohz()         do { } while (0)
 #endif /* CONFIG_NO_HZ */
 
+/*
+ * A context switch is a grace period for rcupreempt synchronize_rcu()
+ * only during early boot, before the scheduler has been initialized.
+ * So, how the heck do we get a context switch?  Well, if the caller
+ * invokes synchronize_rcu(), they are willing to accept a context
+ * switch, so we simply pretend that one happened.
+ *
+ * After boot, there might be a blocked or preempted task in an RCU
+ * read-side critical section, so we cannot then take the fastpath.
+ */
+static inline int rcu_blocking_is_gp(void)
+{
+        return num_online_cpus() == 1 && !rcu_scheduler_active;
+}
+
 #endif /* __LINUX_RCUPREEMPT_H */
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index d4368b7975c3..a722fb67bb2d 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -326,4 +326,10 @@ static inline void rcu_exit_nohz(void)
 }
 #endif /* CONFIG_NO_HZ */
 
+/* A context switch is a grace period for rcutree. */
+static inline int rcu_blocking_is_gp(void)
+{
+        return num_online_cpus() == 1;
+}
+
 #endif /* __LINUX_RCUTREE_H */