additional bit in task & page struct

["amey d inamdar" <iamey@rediffmail.com>]

Hi...
   I want to add my own bit (a #define PG_MYBIT) similar to into the flags in task_struct as defined in linux v2.4.4 in sched.h which is defined as:

unsigned long flag; /*per process flags */ 

   I want a free #define where I can define the process specific flag like PG_EXITING, PG_STARTING.

   Similarly, I also want to add my own bit into the flags in the _page struct_ wherein I can establish the state of a particular page.
  
   Using this my program wants to distinguish between some privileged pages of a process (privileged for my program which serves them..) from other processes and pages.

   Please tell me which #define can I use to do this in both the structures.
  
   Thanking you in advance,
 
   Amey. 

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