Merge branch 'perf/urgent' into perf/core to fix conflicts

Conflicts:
	tools/perf/bench/numa.c

Signed-off-by: Ingo Molnar <mingo@kernel.org>

3 files changed, 14 insertions, 12 deletions

diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
index 19c19a5eee29..f6c82de12541 100644
--- a/include/linux/ipc_namespace.h
+++ b/include/linux/ipc_namespace.h
@@ -34,9 +34,9 @@ struct ipc_namespace {
         int             sem_ctls[4];
         int             used_sems;
 
-        int             msg_ctlmax;
-        int             msg_ctlmnb;
-        int             msg_ctlmni;
+        unsigned int    msg_ctlmax;
+        unsigned int    msg_ctlmnb;
+        unsigned int    msg_ctlmni;
         atomic_t        msg_bytes;
         atomic_t        msg_hdrs;
         int             auto_msgmni;
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index cc88172c7d9a..c74088ab103b 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -332,7 +332,7 @@ do {									\
 #endif
 
 #ifndef this_cpu_sub
-# define this_cpu_sub(pcp, val)         this_cpu_add((pcp), -(val))
+# define this_cpu_sub(pcp, val)         this_cpu_add((pcp), -(typeof(pcp))(val))
 #endif
 
 #ifndef this_cpu_inc
@@ -418,7 +418,7 @@ do {									\
 # define this_cpu_add_return(pcp, val)  __pcpu_size_call_return2(this_cpu_add_return_, pcp, val)
 #endif
 
-#define this_cpu_sub_return(pcp, val)   this_cpu_add_return(pcp, -(val))
+#define this_cpu_sub_return(pcp, val)   this_cpu_add_return(pcp, -(typeof(pcp))(val))
 #define this_cpu_inc_return(pcp)        this_cpu_add_return(pcp, 1)
 #define this_cpu_dec_return(pcp)        this_cpu_add_return(pcp, -1)
 
@@ -586,7 +586,7 @@ do {									\
 #endif
 
 #ifndef __this_cpu_sub
-# define __this_cpu_sub(pcp, val)       __this_cpu_add((pcp), -(val))
+# define __this_cpu_sub(pcp, val)       __this_cpu_add((pcp), -(typeof(pcp))(val))
 #endif
 
 #ifndef __this_cpu_inc
@@ -668,7 +668,7 @@ do {									\
         __pcpu_size_call_return2(__this_cpu_add_return_, pcp, val)
 #endif
 
-#define __this_cpu_sub_return(pcp, val) __this_cpu_add_return(pcp, -(val))
+#define __this_cpu_sub_return(pcp, val) __this_cpu_add_return(pcp, -(typeof(pcp))(val))
 #define __this_cpu_inc_return(pcp)      __this_cpu_add_return(pcp, 1)
 #define __this_cpu_dec_return(pcp)      __this_cpu_add_return(pcp, -1)
 
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index da48837d617d..e1802d6153ae 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -479,13 +479,15 @@ struct perf_event_mmap_page {
         /*
          * Control data for the mmap() data buffer.
          *
-         * User-space reading the @data_head value should issue an rmb(), on
-         * SMP capable platforms, after reading this value -- see
-         * perf_event_wakeup().
+         * User-space reading the @data_head value should issue an smp_rmb(),
+         * after reading this value.
          *
          * When the mapping is PROT_WRITE the @data_tail value should be
-         * written by userspace to reflect the last read data. In this case
-         * the kernel will not over-write unread data.
+         * written by userspace to reflect the last read data, after issueing
+         * an smp_mb() to separate the data read from the ->data_tail store.
+         * In this case the kernel will not over-write unread data.
+         *
+         * See perf_output_put_handle() for the data ordering.
          */
         __u64   data_head;              /* head in the data section */
         __u64   data_tail;              /* user-space written tail */