[RFC PATCH 1/4] powerpc: asm: introduce new macros for assembly globals

[Naveen N. Rao]

- Introduce _GLOBAL_SYM() for global symbols in assembly. This helps
reduce verbosity of assembly files.
- Introduce NOKPROBE variants of _GLOBAL() and _GLOBAL_SYM(). These are
used subsequently to blacklist certain assembly functions and symbols
from kprobe.
- Fix a small typo in kprobe comment and re-format it, to make it
clearer.

Signed-off-by: Naveen N. Rao <naveen.n.rao at linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/ppc_asm.h | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index 025833b..2443545 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -254,13 +254,19 @@ GLUE(.,name):
 
 #endif
 
+#define _GLOBAL_SYM(name)	\
+	.globl name;		\
+name:
+
 /*
  * __kprobes (the C annotation) puts the symbol into the .kprobes.text
  * section, which gets emitted at the end of regular text.
  *
  * _ASM_NOKPROBE_SYMBOL and NOKPROBE_SYMBOL just adds the symbol to
- * a blacklist. The former is for core kprobe functions/data, the
- * latter is for those that incdentially must be excluded from probing
+ * a blacklist.
+ *
+ * The former (__kprobes) is for core kprobe functions/data, the
+ * latter is for those that incidentally must be excluded from probing
  * and allows them to be linked at more optimal location within text.
  */
 #ifdef CONFIG_KPROBES
@@ -272,6 +278,15 @@ GLUE(.,name):
 #define _ASM_NOKPROBE_SYMBOL(entry)
 #endif
 
+#define _GLOBAL_NOKPROBE(name)				\
+	_GLOBAL(name);					\
+	_ASM_NOKPROBE_SYMBOL(name)
+
+#define _GLOBAL_SYM_NOKPROBE(name)			\
+	_GLOBAL_SYM(name);				\
+	_ASM_NOKPROBE_SYMBOL(name)
+
+
 #define FUNC_START(name)	_GLOBAL(name)
 #define FUNC_END(name)
 
-- 
2.10.2