The changes were obtained by applying the following Coccinelle script.

A bit of clarification happened for its implementation details.
https://systeme.lip6.fr/pipermail/cocci/2018-October/005374.html

I have taken also another look at the following SmPL code.

identifier fn =~
"^(__pte_alloc|pte_alloc_one|pte_alloc|__pte_alloc_kernel|pte_alloc_one_kernel)$";

I suggest to adjust the regular expression for this constraint
and in subsequent SmPL rules.

"^(?:pte_alloc(?:_one(?:_kernel)?)?|__pte_alloc(?:_kernel)?)$";

(
- T3 fn(T1 E1, T2 E2);
+ T3 fn(T1 E1);
|
- T3 fn(T1 E1, T2 E2, T4 E4);
+ T3 fn(T1 E1, T2 E2);
)

I propose to take an other SmPL disjunction into account here.

 T3 fn(T1 E1,
(
-      T2 E2
|      T2 E2,
-      T4 E4
)      );

(
- #define fn(a, b, c)@p e
+ #define fn(a, b) e
|
- #define fn(a, b)@p e
+ #define fn(a) e
)

How do you think about to omit the metavariable “position p” here?

Regards,
Markus