[Cocci] [PATCH] coccinelle: deref_null: avoid useless computation

[Julia Lawall]

The effect of the rules ifm1, pr11, and pr12 is only used in the final rule,
which depends on context && !org && !report. Thus these rules should only
be performed in those circumstances.

Signed-off-by: Julia Lawall <***@lip6.fr>

---
scripts/coccinelle/null/deref_null.cocci | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/scripts/coccinelle/null/deref_null.cocci b/scripts/coccinelle/null/deref_null.cocci
index f192d60..b16ccb7 100644
--- a/scripts/coccinelle/null/deref_null.cocci
+++ b/scripts/coccinelle/null/deref_null.cocci
@@ -212,7 +212,7 @@ else S3
// The following three rules are duplicates of ifm, pr1 and pr2 respectively.
// It is need because the previous rule as already made a "change".

-@ifm1@
+@ifm1 depends on context && !org && !report@
expression *E;
statement S1,S2;
position p1;
@@ -220,7 +220,7 @@ position p1;

***@p1 ((E == NULL && ...) || ...) S1 else S2

-@pr11 expression@
+@pr11 depends on context && !org && !report expression@
expression *ifm1.E;
identifier f;
position p1;
@@ -228,7 +228,7 @@ position p1;

(E != NULL && ...) ? <+...E->***@p1...+> : ...

-@pr12 expression@
+@pr12 depends on context && !org && !report expression@
expression *ifm1.E;
identifier f;
position p2;

[Masahiro Yamada]

Post by Julia Lawall
The effect of the rules ifm1, pr11, and pr12 is only used in the final rule,
which depends on context && !org && !report. Thus these rules should only
be performed in those circumstances.
---

Applied to linux-kbuild/kbuild. Thanks!