ftrace: nmi safe code clean ups

Impact: cleanup

This patch cleans up the NMI safe code for dynamic ftrace as suggested
by Andrew Morton.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

6 files changed, 21 insertions, 21 deletions

diff --git a/arch/arm/include/asm/ftrace.h b/arch/arm/include/asm/ftrace.h
index d4c24a7a928..3f3a1d1508e 100644
--- a/arch/arm/include/asm/ftrace.h
+++ b/arch/arm/include/asm/ftrace.h
@@ -2,8 +2,8 @@
 #define _ASM_ARM_FTRACE
 
 #ifndef __ASSEMBLY__
-#define ftrace_nmi_enter()	do { } while (0)
-#define ftrace_nmi_exit()	do { } while (0)
+static inline void ftrace_nmi_enter(void) { }
+static inline void ftrace_nmi_exit(void) { }
 #endif
 
 #ifdef CONFIG_FUNCTION_TRACER
diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
index 7652755dc00..1cd72700fbc 100644
--- a/arch/powerpc/include/asm/ftrace.h
+++ b/arch/powerpc/include/asm/ftrace.h
@@ -2,8 +2,8 @@
 #define _ASM_POWERPC_FTRACE
 
 #ifndef __ASSEMBLY__
-#define ftrace_nmi_enter()	do { } while (0)
-#define ftrace_nmi_exit()	do { } while (0)
+static inline void ftrace_nmi_enter(void) { }
+static inline void ftrace_nmi_exit(void) { }
 #endif
 
 #ifdef CONFIG_FUNCTION_TRACER
diff --git a/arch/sh/include/asm/ftrace.h b/arch/sh/include/asm/ftrace.h
index cdf2cb0b9ff..31ada0370cb 100644
--- a/arch/sh/include/asm/ftrace.h
+++ b/arch/sh/include/asm/ftrace.h
@@ -2,8 +2,8 @@
 #define __ASM_SH_FTRACE_H
 
 #ifndef __ASSEMBLY__
-#define ftrace_nmi_enter()	do { } while (0)
-#define ftrace_nmi_exit()	do { } while (0)
+static inline void ftrace_nmi_enter(void) { }
+static inline void ftrace_nmi_exit(void) { }
 #endif
 
 #ifndef __ASSEMBLY__
diff --git a/arch/sparc/include/asm/ftrace.h b/arch/sparc/include/asm/ftrace.h
index 33a95feeb13..62055ac0496 100644
--- a/arch/sparc/include/asm/ftrace.h
+++ b/arch/sparc/include/asm/ftrace.h
@@ -2,8 +2,8 @@
 #define _ASM_SPARC64_FTRACE
 
 #ifndef __ASSEMBLY__
-#define ftrace_nmi_enter()	do { } while (0)
-#define ftrace_nmi_exit()	do { } while (0)
+static inline void ftrace_nmi_enter(void) { }
+static inline void ftrace_nmi_exit(void) { }
 #endif
 
 #ifdef CONFIG_MCOUNT
diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
index f2ed6b704a7..a23468194b8 100644
--- a/arch/x86/include/asm/ftrace.h
+++ b/arch/x86/include/asm/ftrace.h
@@ -22,16 +22,16 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr)
 extern void ftrace_nmi_enter(void);
 extern void ftrace_nmi_exit(void);
 #else
-#define ftrace_nmi_enter()	do { } while (0)
-#define ftrace_nmi_exit()	do { } while (0)
-#endif
+static inline void ftrace_nmi_enter(void) { }
+static inline void ftrace_nmi_exit(void) { }
 #endif
+#endif /* __ASSEMBLY__ */
 
 #else /* CONFIG_FUNCTION_TRACER */
 
 #ifndef __ASSEMBLY__
-#define ftrace_nmi_enter()	do { } while (0)
-#define ftrace_nmi_exit()	do { } while (0)
+static inline void ftrace_nmi_enter(void) { }
+static inline void ftrace_nmi_exit(void) { }
 #endif
 
 #endif /* CONFIG_FUNCTION_TRACER */
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 6685b0fc1b4..69149337f2f 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -67,7 +67,7 @@ unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
  *
  * Two buffers are added: An IP buffer and a "code" buffer.
  *
- * 1) Put in the instruction pointer into the IP buffer
+ * 1) Put the instruction pointer into the IP buffer
  *    and the new code into the "code" buffer.
  * 2) Set a flag that says we are modifying code
  * 3) Wait for any running NMIs to finish.
@@ -85,14 +85,14 @@ unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
  * are the same as what exists.
  */
 
-static atomic_t in_nmi;
-static int mod_code_status;
-static int mod_code_write;
-static void *mod_code_ip;
-static void *mod_code_newcode;
+static atomic_t in_nmi = ATOMIC_INIT(0);
+static int mod_code_status;		/* holds return value of text write */
+static int mod_code_write;		/* set when NMI should do the write */
+static void *mod_code_ip;		/* holds the IP to write to */
+static void *mod_code_newcode;		/* holds the text to write to the IP */
 
-static int nmi_wait_count;
-static atomic_t nmi_update_count;
+static unsigned nmi_wait_count;
+static atomic_t nmi_update_count = ATOMIC_INIT(0);
 
 int ftrace_arch_read_dyn_info(char *buf, int size)
 {