From 06a51d9307380c78bb5c92e68fc80ad2c7d7f890 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Mon, 19 Dec 2011 19:07:36 -0500 Subject: [PATCH] ftrace: Create ftrace_hash_empty() helper routine There are two types of hashes in the ftrace_ops; one type is the filter_hash and the other is the notrace_hash. Either one may be null, meaning it has no elements. But when elements are added, the hash is allocated. Throughout the code, a check needs to be made to see if a hash exists or the hash has elements, but the check if the hash exists is usually missing causing the possible "NULL pointer dereference bug". Add a helper routine called "ftrace_hash_empty()" that returns true if the hash doesn't exist or its count is zero. As they mean the same thing. Last-bug-reported-by: Jiri Olsa Signed-off-by: Steven Rostedt --- Reading git-format-patch failed