From: Steven Rostedt (Red Hat) Date: Mon, 13 Jan 2014 17:56:21 +0000 (-0500) Subject: ftrace: Fix synchronization location disabling and freeing ftrace_ops X-Git-Tag: v3.2.56~165 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=82d12fc84435b9c815357e306dfd844f54a62714;p=pandora-kernel.git ftrace: Fix synchronization location disabling and freeing ftrace_ops commit a4c35ed241129dd142be4cadb1e5a474a56d5464 upstream. The synchronization needed after ftrace_ops are unregistered must happen after the callback is disabled from becing called by functions. The current location happens after the function is being removed from the internal lists, but not after the function callbacks were disabled, leaving the functions susceptible of being called after their callbacks are freed. This affects perf and any externel users of function tracing (LTTng and SystemTap). Fixes: cdbe61bfe704 "ftrace: Allow dynamically allocated function tracers" Signed-off-by: Steven Rostedt [bwh: Backported to 3.2: drop change for control ops] Signed-off-by: Ben Hutchings Acked-by: Steven Rostedt --- Reading git-diff-tree failed