Hello,

  I tried spatch command again with few other files and it ran 
successfully. (with the same ret.cocci file I sent)

  spatch --sp-file ret.cocci --no-includes 
~/git/kernels/staging/drivers/staging/sm750fb/ddk750_chip.c > ret.out
  init_defs_builtins: /usr/lib64/coccinelle/standard.h
  HANDLING: 
/home/euri/git/kernels/staging/drivers/staging/sm750fb/ddk750_chip.c
  diff = 

   output of ret.out

   --- 
/home/varsha/git/kernels/staging/drivers/staging/sm750fb/ddk750_chip.c
+++ /tmp/cocci-output-3058-919028-ddk750_chip.c
@@ -397,13 +397,11 @@ unsigned int sm750_format_pll_reg(struct
      * register. On returning a 32 bit number, the value can be
      * applied to any PLL in the calling function.
      */
-    reg = PLL_CTRL_POWER |
+    return PLL_CTRL_POWER |
 #ifndef VALIDATION_CHIP
         ((POD << PLL_CTRL_POD_SHIFT) & PLL_CTRL_POD_MASK) |
 #endif
         ((OD << PLL_CTRL_OD_SHIFT) & PLL_CTRL_OD_MASK) |
         ((N << PLL_CTRL_N_SHIFT) & PLL_CTRL_N_MASK) |
         ((M << PLL_CTRL_M_SHIFT) & PLL_CTRL_M_MASK);
-
-    return reg;
 }

   
   But nothing with dim2_sysfs.c file and even ret.out file is empty. But 
no errors this time.

  spatch --sp-file ret.cocci --no-includes 
~/git/kernels/staging/drivers/staging/most/hdm-dim2/dim2_sysfs.c  > ret.out
  init_defs_builtins: /usr/lib64/coccinelle/standard.h
  HANDLING: 
/home/euri/git/kernels/staging/drivers/staging/most/hdm-dim2/dim2_sysfs.c
   
  Does coccinelle need driver to be compiled as a module? As hdm_dim2 
driver is not but sm750fb driver is compiled as a module. Does coccinelle 
require executable file to work?

  Thanks,
  Varsha