Merge commit 'origin/master' into next

[deliverable/linux.git] / arch / x86 / kernel / ptrace.c

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 0a5df5f82fb9579b1be4e824aa499ac561d9ba10..06ca07f6ad86243884c7852c13334d9da9604acf 100644 (file)
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -810,12 +810,16 @@ static void ptrace_bts_untrace(struct task_struct *child)
 
 static void ptrace_bts_detach(struct task_struct *child)
 {
-       if (unlikely(child->bts)) {
-               ds_release_bts(child->bts);
-               child->bts = NULL;
-
-               ptrace_bts_free_buffer(child);
-       }
+       /*
+        * Ptrace_detach() races with ptrace_untrace() in case
+        * the child dies and is reaped by another thread.
+        *
+        * We only do the memory accounting at this point and
+        * leave the buffer deallocation and the bts tracer
+        * release to ptrace_bts_untrace() which will be called
+        * later on with tasklist_lock held.
+        */
+       release_locked_buffer(child->bts_buffer, child->bts_size);
 }
 #else
 static inline void ptrace_bts_fork(struct task_struct *tsk) {}
@@ -1384,7 +1388,7 @@ void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
 #ifdef CONFIG_X86_32
 # define IS_IA32       1
 #elif defined CONFIG_IA32_EMULATION
-# define IS_IA32       test_thread_flag(TIF_IA32)
+# define IS_IA32       is_compat_task()
 #else
 # define IS_IA32       0
 #endif