linux-kernel - [PATCH] coccinelle: use exists to improve efficiency

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Date:   Sun, 12 Nov 2017 16:02:18 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
cc:     cocci@...teme.lip6.fr, Nicolas Palix <nicolas.palix@...g.fr>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        linux-kernel@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>
Subject: [PATCH] coccinelle: use exists to improve efficiency

This just needs to find any reassignment of the loop iterator, and doesn't
need such a thing on all execution paths, so use exists on the first rule.

Signed-off-by: Julia Lawall <julia.lawall@...6.fr>

---

diff --git a/scripts/coccinelle/iterators/list_entry_update.cocci b/scripts/coccinelle/iterators/list_entry_update.cocci
index 873f444..be6f9f1 100644
--- a/scripts/coccinelle/iterators/list_entry_update.cocci
+++ b/scripts/coccinelle/iterators/list_entry_update.cocci
@@ -15,7 +15,7 @@ virtual context
 virtual org
 virtual report

-@r@
+@r exists@
 iterator name list_for_each_entry;
 expression x,E;
 position p1,p2;