hi steve, As you suggested, i have used an array of const pointers to const strings. This is the version-1 of the patch, it breaks in write. I faced two problems here 1. The above code can't be able to write to set_ftrace_filter file string by string (for normal files its working fine), After every successful write i am getting the count bytes written as supplied size, but strings are not getting written in the set_ftrace_filter file. please give me any review or debug inputs on this 2.I don't know how to reply to previous thread using git send-email, i apologize for that, please do let me know how to reply to the older threads using the git send-email. Once i have the write functionality working fine, will implement the other features incrementally. Thanks, sameer.