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

* 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (44 commits)
  vsnprintf: remove duplicate comment of vsnprintf
  softirq: add BLOCK_IOPOLL to softirq_to_name
  oprofile: fix oprofile regression: select RING_BUFFER_ALLOW_SWAP
  tracing: switch function prints from %pf to %ps
  vsprintf: add %ps that is the same as %pS but is like %pf
  tracing: Fix minor bugs for __unregister_ftrace_function_probe
  tracing: remove notrace from __kprobes annotation
  tracing: optimize global_trace_clock cachelines
  MAINTAINERS: Update tracing tree details
  ftrace: document function and function graph implementation
  tracing: make testing syscall events a separate configuration
  tracing: remove some unused macros
  ftrace: add compile-time check on F_printk()
  tracing: fix F_printk() typos
  tracing: have TRACE_EVENT macro use __flags to not shadow parameter
  tracing: add static to generated TRACE_EVENT functions
  ring-buffer: typecast cmpxchg to fix PowerPC warning
  tracing: add filter event logic to special, mmiotrace and boot tracers
  tracing: remove trace_event_types.h
  tracing: use the new trace_entries.h to create format files
  ...

3 files changed, 6 insertions, 3 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index beea3ccebb5e..7f418bbc261a 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -9,6 +9,7 @@ config OPROFILE
         depends on TRACING_SUPPORT
         select TRACING
         select RING_BUFFER
+        select RING_BUFFER_ALLOW_SWAP
         help
           OProfile is a profiling system capable of profiling the
           whole system, include the kernel, kernel modules, libraries,
diff --git a/arch/x86/include/asm/nops.h b/arch/x86/include/asm/nops.h
index ad2668ee1aa7..6d8723a766cc 100644
--- a/arch/x86/include/asm/nops.h
+++ b/arch/x86/include/asm/nops.h
@@ -65,6 +65,8 @@
    6: osp nopl 0x00(%eax,%eax,1)
    7: nopl 0x00000000(%eax)
    8: nopl 0x00000000(%eax,%eax,1)
+   Note: All the above are assumed to be a single instruction.
+        There is kernel code that depends on this.
 */
 #define P6_NOP1 GENERIC_NOP1
 #define P6_NOP2 ".byte 0x66,0x90\n"
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index c251be745107..d59fe323807e 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -146,7 +146,7 @@ ENTRY(ftrace_graph_caller)
 END(ftrace_graph_caller)
 
 GLOBAL(return_to_handler)
-        subq  $80, %rsp
+        subq  $24, %rsp
 
         /* Save the return values */
         movq %rax, (%rsp)
@@ -155,10 +155,10 @@ GLOBAL(return_to_handler)
 
         call ftrace_return_to_handler
 
-        movq %rax, 72(%rsp)
+        movq %rax, 16(%rsp)
         movq 8(%rsp), %rdx
         movq (%rsp), %rax
-        addq $72, %rsp
+        addq $16, %rsp
         retq
 #endif