Merge branch 'linus' into perfcounters/core

[cascardo/linux.git] / arch / x86 / kernel / signal.c

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 89bb766..0bc73d6 100644 (file)
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -6,7 +6,7 @@
  *  2000-06-20  Pentium III FXSR, SSE support by Gareth Hughes
  *  2000-2002   x86-64 support by Andi Kleen
  */
-
+#include <linux/perf_counter.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
@@ -632,9 +632,16 @@ badframe:
 }
 
 #ifdef CONFIG_X86_32
-asmlinkage int sys_rt_sigreturn(struct pt_regs regs)
+/*
+ * Note: do not pass in pt_regs directly as with tail-call optimization
+ * GCC will incorrectly stomp on the caller's frame and corrupt user-space
+ * register state:
+ */
+asmlinkage int sys_rt_sigreturn(unsigned long __unused)
 {
-       return do_rt_sigreturn(&regs);
+       struct pt_regs *regs = (struct pt_regs *)&__unused;
+
+       return do_rt_sigreturn(regs);
 }
 #else /* !CONFIG_X86_32 */
 asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
@@ -886,6 +893,11 @@ do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
                tracehook_notify_resume(regs);
        }
 
+       if (thread_info_flags & _TIF_PERF_COUNTERS) {
+               clear_thread_flag(TIF_PERF_COUNTERS);
+               perf_counter_notify(regs);
+       }
+
 #ifdef CONFIG_X86_32
        clear_thread_flag(TIF_IRET);
 #endif /* CONFIG_X86_32 */