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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-06-27 21:18:19 -0400 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-06-28 14:21:25 -0400 |
| commit | 39611265edc1af3d574178202e19c31e187e7cf2 (patch) | |
| tree | 5a2fb0590d8da026037129d73500754edceedbc8 /kernel | |
| parent | d5b844a2cf507fc7642c9ae80a9d585db3065c28 (diff) | |
| download | linux-39611265edc1af3d574178202e19c31e187e7cf2.tar.bz2 | |
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>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions