linux-kernel - [PATCH] Coccinelle: zalloc-simple: Delete function "kmem_cache

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Date:   Thu, 1 Feb 2018 10:35:57 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     cocci@...teme.lip6.fr, Gilles Muller <Gilles.Muller@...6.fr>,
        Himanshu Jha <himanshujha199640@...il.com>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] Coccinelle: zalloc-simple: Delete function "kmem_cache_alloc"
 from SmPL rules

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Thu, 1 Feb 2018 10:20:47 +0100

The deletion for a call of the function "memset" depends on
the specification that a size determination is passed by
the expression "E1".
The function "kmem_cache_alloc" was specified despite of the technical
detail that this function does not get a parameter passed which would
correspond to such a size information.

Thus remove it from the first two SmPL rules and omit the rule "r4".

Link: https://elixir.free-electrons.com/linux/v4.15/source/tools/testing/radix-tree/linux/slab.h#L14
Link: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/tools/testing/radix-tree/linux/slab.h?id=f26e52e08ab8e56f528ac14aa7929b3477de5616#n14
Fixes: 5e2d9da5b9ba350a4f13bd3b255be046bcf86465 ("Coccinelle: kzalloc-simple: Add all zero allocating functions")
Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 scripts/coccinelle/api/alloc/zalloc-simple.cocci | 41 +-----------------------
 1 file changed, 1 insertion(+), 40 deletions(-)

diff --git a/scripts/coccinelle/api/alloc/zalloc-simple.cocci b/scripts/coccinelle/api/alloc/zalloc-simple.cocci
index 92b20913055f..3bee6cdd99ea 100644
--- a/scripts/coccinelle/api/alloc/zalloc-simple.cocci
+++ b/scripts/coccinelle/api/alloc/zalloc-simple.cocci
@@ -34,7 +34,7 @@ statement S;
 @@
 
 * x = (T)\(kmalloc(E1, ...)\|vmalloc(E1)\|dma_alloc_coherent(...,E1,...)\|
-  kmalloc_node(E1, ...)\|kmem_cache_alloc(...)\|kmem_alloc(E1, ...)\|
+  kmalloc_node(E1, ...)\|kmem_alloc(E1, ...)\|
   devm_kmalloc(...,E1,...)\|kvmalloc(E1, ...)\|pci_alloc_consistent(...,E1,...)\|
   kvmalloc_node(E1,...)\);
   if ((x==NULL) || ...) S
@@ -88,15 +88,6 @@ statement S;
 - x = (T)kmalloc_node(E1,E2,E3);
 + x = (T)kzalloc_node(E1,E2,E3);
 |
-- x = kmem_cache_alloc(E3,E4);
-+ x = kmem_cache_zalloc(E3,E4);
-|
-- x = (T *)kmem_cache_alloc(E3,E4);
-+ x = kmem_cache_zalloc(E3,E4);
-|
-- x = (T)kmem_cache_alloc(E3,E4);
-+ x = (T)kmem_cache_zalloc(E3,E4);
-|
 - x = kmem_alloc(E1,E2);
 + x = kmem_zalloc(E1,E2);
 |
@@ -268,36 +259,6 @@ x << r3.x;
 msg="WARNING: kzalloc_node should be used for %s, instead of kmalloc_node/memset" % (x)
 coccilib.report.print_report(p[0], msg)
 
-//-----------------------------------------------------------------
-@r4 depends on org || report@
-type T, T2;
-expression x;
-expression E1,E2,E3;
-statement S;
-position p;
-@@
-
- x = (T)kmem_cache_alloc@p(E2,E3);
- if ((x==NULL) || ...) S
- memset((T2)x,0,E1);
-
-@...ipt:python depends on org@
-p << r4.p;
-x << r4.x;
-@@
-
-msg="%s" % (x)
-msg_safe=msg.replace("[","@(").replace("]",")")
-coccilib.org.print_todo(p[0], msg_safe)
-
-@...ipt:python depends on report@
-p << r4.p;
-x << r4.x;
-@@
-
-msg="WARNING: kmem_cache_zalloc should be used for %s, instead of kmem_cache_alloc/memset" % (x)
-coccilib.report.print_report(p[0], msg)
-
 //-----------------------------------------------------------------
 @r5 depends on org || report@
 type T, T2;
-- 
2.16.1