ftrace/x86: Add a comment to why we take text_mutex in ftrace_arch_code_modify_prepare()
Taking the text_mutex in ftrace_arch_code_modify_prepare() is to fix a race against module loading and live kernel patching that might try to change the text permissions while ftrace has it as read/write. This really needs to be documented in the code. Add a comment that does such. Link: http://lkml.kernel.org/r/20190627211819.5a591f52@gandalf.local.home Suggested-by:Josh Poimboeuf <jpoimboe@redhat.com> Reviewed-by:
Josh Poimboeuf <jpoimboe@redhat.com> Reviewed-by:
Petr Mladek <pmladek@suse.com> Signed-off-by:
Steven Rostedt (VMware) <rostedt@goodmis.org>
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d5b844a2
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