Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  perf, x86: Fix incorrect branches event on AMD CPUs
  perf tools: Fix find tids routine by excluding "." and ".."
  x86: Send a SIGTRAP for user icebp traps

3 files changed, 22 insertions, 4 deletions

diff --git a/arch/x86/kernel/cpu/perf_event_amd.c b/arch/x86/kernel/cpu/perf_event_amd.c
index 611df11ba15e..c2897b7b4a3b 100644
--- a/arch/x86/kernel/cpu/perf_event_amd.c
+++ b/arch/x86/kernel/cpu/perf_event_amd.c
@@ -102,8 +102,8 @@ static const u64 amd_perfmon_event_map[] =
   [PERF_COUNT_HW_INSTRUCTIONS]          = 0x00c0,
   [PERF_COUNT_HW_CACHE_REFERENCES]      = 0x0080,
   [PERF_COUNT_HW_CACHE_MISSES]          = 0x0081,
-  [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]   = 0x00c4,
-  [PERF_COUNT_HW_BRANCH_MISSES]         = 0x00c5,
+  [PERF_COUNT_HW_BRANCH_INSTRUCTIONS]   = 0x00c2,
+  [PERF_COUNT_HW_BRANCH_MISSES]         = 0x00c3,
 };
 
 static u64 amd_pmu_event_map(int hw_event)
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 142d70c74b02..725ef4d17cd5 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -526,6 +526,7 @@ asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
 dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
 {
         struct task_struct *tsk = current;
+        int user_icebp = 0;
         unsigned long dr6;
         int si_code;
 
@@ -534,6 +535,14 @@ dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
         /* Filter out all the reserved bits which are preset to 1 */
         dr6 &= ~DR6_RESERVED;
 
+        /*
+         * If dr6 has no reason to give us about the origin of this trap,
+         * then it's very likely the result of an icebp/int01 trap.
+         * User wants a sigtrap for that.
+         */
+        if (!dr6 && user_mode(regs))
+                user_icebp = 1;
+
         /* Catch kmemcheck conditions first of all! */
         if ((dr6 & DR_STEP) && kmemcheck_trap(regs))
                 return;
@@ -575,7 +584,7 @@ dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
                 regs->flags &= ~X86_EFLAGS_TF;
         }
         si_code = get_si_code(tsk->thread.debugreg6);
-        if (tsk->thread.debugreg6 & (DR_STEP | DR_TRAP_BITS))
+        if (tsk->thread.debugreg6 & (DR_STEP | DR_TRAP_BITS) || user_icebp)
                 send_sigtrap(tsk, regs, error_code, si_code);
         preempt_conditional_cli(regs);
 
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 1f7ecd47f499..9a448b47400c 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -7,6 +7,15 @@
 #include "util.h"
 #include "debug.h"
 
+/* Skip "." and ".." directories */
+static int filter(const struct dirent *dir)
+{
+        if (dir->d_name[0] == '.')
+                return 0;
+        else
+                return 1;
+}
+
 int find_all_tid(int pid, pid_t ** all_tid)
 {
         char name[256];
@@ -16,7 +25,7 @@ int find_all_tid(int pid, pid_t ** all_tid)
         int i;
 
         sprintf(name, "/proc/%d/task", pid);
-        items = scandir(name, &namelist, NULL, NULL);
+        items = scandir(name, &namelist, filter, NULL);
         if (items <= 0)
                 return -ENOENT;
         *all_tid = malloc(sizeof(pid_t) * items);