[PATCH] objtool,x86: Verify poke_int3_handler() is self contained

[peterz]

Abuse the SMAP rules to ensure poke_int3_handler() doesn't call out to
anything.

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
 tools/objtool/check.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -551,6 +551,14 @@ static const char *uaccess_safe_builtin[
 	"__memcpy_mcsafe",
 	"mcsafe_handle_tail",
 	"ftrace_likely_update", /* CONFIG_TRACE_BRANCH_PROFILING */
+	/*
+	 * Abuse alert!
+	 *
+	 * poke_int3_handler() is not in fact related to uaccess at all, we
+	 * abuse the uaccess rules to ensure poke_int3_handler() is self
+	 * contained and doesn't CALL out to other code.
+	 */
+	"poke_int3_handler",
 	NULL
 };