linux-kernel - [PATCH v2] Coccinelle: api: Add SmPL script “use_KMEM

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Date: Fri, 2 Feb 2024 10:12:11 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: cocci@...ia.fr, kernel-janitors@...r.kernel.org,
 Julia Lawall <Julia.Lawall@...ia.fr>, Nicolas Palix <nicolas.palix@...g.fr>
Cc: LKML <linux-kernel@...r.kernel.org>, Kunwu Chan <chentao@...inos.cn>
Subject: [PATCH v2] Coccinelle: api: Add SmPL script “use_KMEM_CACHE.cocci”

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Fri, 2 Feb 2024 09:48:11 +0100

A wrapper macro is available since the commit 0a31bd5f2bbb6473ef9d24f0063ca91cfa678b64
("KMEM_CACHE(): simplify slab cache creation").
Provide design options for the adjustment of affected source code
by the means of the semantic patch language (Coccinelle software).

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---

v2:
* The reference for the previous commit was adjusted in
  the patch description.

* A constraint was added for the metavariable “text”
  also based on information in a hint by Julia Lawall from 2018-02-17.

  [Cocci] Clarification for scripted SmPL constraints
  https://lore.kernel.org/cocci/alpine.DEB.2.20.1802171531330.2205@hadrien/



 scripts/coccinelle/api/use_KMEM_CACHE.cocci | 53 +++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 scripts/coccinelle/api/use_KMEM_CACHE.cocci

diff --git a/scripts/coccinelle/api/use_KMEM_CACHE.cocci b/scripts/coccinelle/api/use_KMEM_CACHE.cocci
new file mode 100644
index 000000000000..e158e4c7c1d1
--- /dev/null
+++ b/scripts/coccinelle/api/use_KMEM_CACHE.cocci
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+/// Simplify a function call by using a known wrapper macro.
+//
+// Keywords: wrapper macro conversion cache creation
+// Confidence: High
+// Options: --no-includes --include-headers
+
+virtual context, patch, report, org
+
+@...tialize:python@
+@@
+def is_equal(text, id):
+   return True if text[1:-1] == id else False
+
+@...ends on context disable sizeof_type_expr@
+expression alignment, flags;
+identifier id;
+constant char[] text: script:python(id) { is_equal(text, id) };
+@@
+*kmem_cache_create(text, sizeof(struct id), alignment, flags, NULL)
+
+@...ends on patch disable sizeof_type_expr@
+expression alignment, flags;
+identifier id;
+constant char[] text: script:python(id) { is_equal(text, id) };
+@@
+-kmem_cache_create
++KMEM_CACHE
+ (
+-text, sizeof(struct
+ id
+-), alignment
+ , flags
+-, NULL
+ )
+
+@x depends on org || report disable sizeof_type_expr@
+expression alignment, flags;
+identifier id;
+constant char[] text: script:python(id) { is_equal(text, id) };
+position p;
+@@
+ kmem_cache_create@p(text, sizeof(struct id), alignment, flags, NULL)
+
+@...ipt:python depends on org@
+p << x.p;
+@@
+coccilib.org.print_todo(p[0], "WARNING: opportunity for KMEM_CACHE()")
+
+@...ipt:python depends on report@
+p << x.p;
+@@
+coccilib.report.print_report(p[0], "WARNING: opportunity for KMEM_CACHE()")
--
2.43.0