Merge branch 'akpm-incoming-2'

* akpm-incoming-2: (139 commits)
  epoll: make epoll_wait() use the hrtimer range feature
  select: rename estimate_accuracy() to select_estimate_accuracy()
  Remove duplicate includes from many files
  ramoops: use the platform data structure instead of module params
  kernel/resource.c: handle reinsertion of an already-inserted resource
  kfifo: fix kfifo_alloc() to return a signed int value
  w1: don't allow arbitrary users to remove w1 devices
  alpha: remove dma64_addr_t usage
  mips: remove dma64_addr_t usage
  sparc: remove dma64_addr_t usage
  fuse: use release_pages()
  taskstats: use real microsecond granularity for CPU times
  taskstats: split fill_pid function
  taskstats: separate taskstats commands
  delayacct: align to 8 byte boundary on 64-bit systems
  delay-accounting: reimplement -c for getdelays.c to report information on a target command
  namespaces Kconfig: move namespace menu location after the cgroup
  namespaces Kconfig: remove the cgroup device whitelist experimental tag
  namespaces Kconfig: remove pointless cgroup dependency
  namespaces Kconfig: make namespace a submenu
  ...

1 files changed, 12 insertions, 4 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 393ce94e54b7..be7adb7588e5 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -626,6 +626,10 @@ struct signal_struct {
 
         int oom_adj;            /* OOM kill score adjustment (bit shift) */
         int oom_score_adj;      /* OOM kill score adjustment */
+
+        struct mutex cred_guard_mutex;  /* guard against foreign influences on
+                                         * credential calculations
+                                         * (notably. ptrace) */
 };
 
 /* Context switch must be unlocked if interrupts are to be enabled */
@@ -1305,9 +1309,6 @@ struct task_struct {
                                          * credentials (COW) */
         const struct cred __rcu *cred;  /* effective (overridable) subjective task
                                          * credentials (COW) */
-        struct mutex cred_guard_mutex;  /* guard against foreign influences on
-                                         * credential calculations
-                                         * (notably. ptrace) */
         struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
 
         char comm[TASK_COMM_LEN]; /* executable name excluding path
@@ -2236,9 +2237,16 @@ static inline void task_unlock(struct task_struct *p)
         spin_unlock(&p->alloc_lock);
 }
 
-extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
+extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
                                                         unsigned long *flags);
 
+#define lock_task_sighand(tsk, flags)                                   \
+({      struct sighand_struct *__ss;                                    \
+        __cond_lock(&(tsk)->sighand->siglock,                           \
+                    (__ss = __lock_task_sighand(tsk, flags)));          \
+        __ss;                                                           \
+})                                                                      \
+
 static inline void unlock_task_sighand(struct task_struct *tsk,
                                                 unsigned long *flags)
 {