[Cocci] [PATCH] Coccinelle: zalloc-simple: Delete function "kmem_cache_alloc" from SmPL rules

Julia Lawall julia.lawall at lip6.fr
Thu Feb 1 10:40:40 CET 2018



On Thu, 1 Feb 2018, SF Markus Elfring wrote:

> From: Markus Elfring <elfring at users.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".

Nack.  It should be supported by the size determined in another way.

julia

> 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 at users.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)
>
> -//-----------------------------------------------------------------
> - at r4 depends on org || report@
> -type T, T2;
> -expression x;
> -expression E1,E2,E3;
> -statement S;
> -position p;
> -@@
> -
> - x = (T)kmem_cache_alloc at p(E2,E3);
> - if ((x==NULL) || ...) S
> - memset((T2)x,0,E1);
> -
> - at script: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)
> -
> - at script: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
>
> --
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