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Date: Sat, 13 Jan 2018 17:24:22 +0100 (CET)
From: Julia Lawall <julia.lawall@...6.fr>
To: Himanshu Jha <himanshujha199640@...il.com>
cc: yamada.masahiro@...ionext.com, Julia.Lawall@...6.fr,
Gilles Muller <Gilles.Muller@...6.fr>, nicolas.palix@...g.fr,
michal.lkml@...kovi.net, cocci@...teme.lip6.fr,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Coccinelle: alloc_cast: Add more memory allocating
functions to the list
On Sat, 13 Jan 2018, Himanshu Jha wrote:
> Add more memory allocating functions that are frequently used in the kernel
> code to the existing list and remove the useless casts where it is
> unnecessary.
>
> But preserve those casts having __attribute__ such as __force, __iomem,
> etc which are used by Sparse in the static analysis of the code.
>
> Also remove two blank lines at EOF.
>
> Signed-off-by: Himanshu Jha <himanshujha199640@...il.com>
Acked-by: Julia Lawall <julia.lawall@...6.fr>
> ---
> scripts/coccinelle/api/alloc/alloc_cast.cocci | 92 +++++++++++++++++++++------
> 1 file changed, 71 insertions(+), 21 deletions(-)
>
> diff --git a/scripts/coccinelle/api/alloc/alloc_cast.cocci b/scripts/coccinelle/api/alloc/alloc_cast.cocci
> index 6c308ee..408ee38 100644
> --- a/scripts/coccinelle/api/alloc/alloc_cast.cocci
> +++ b/scripts/coccinelle/api/alloc/alloc_cast.cocci
> @@ -5,10 +5,11 @@
> //# kmalloc, kzalloc, kcalloc, kmem_cache_alloc, kmem_cache_zalloc,
> //# kmem_cache_alloc_node, kmalloc_node and kzalloc_node and removes
> //# the casting as it is not required. The result in the patch case may
> -//#need some reformatting.
> +//# need some reformatting.
> //
> // Confidence: High
> -// Copyright: 2014, Himangi Saraogi GPLv2.
> +// Copyright: (C) 2014 Himangi Saraogi GPLv2.
> +// Copyright: (C) 2017 Himanshu Jha GPLv2.
> // Comments:
> // Options: --no-includes --include-headers
> //
> @@ -18,55 +19,104 @@ virtual patch
> virtual org
> virtual report
>
> +@...tialize:python@
> +@@
> +import re
> +pattern = '__'
> +m = re.compile(pattern)
> +
> +@r1 depends on context || patch@
> +type T;
> +@@
> +
> + (T *)
> + \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
> + kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\|
> + dma_alloc_coherent\|dma_zalloc_coherent\|devm_kmalloc\|devm_kzalloc\|
> + kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\|
> + pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\|
> + kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...)
> +
> //----------------------------------------------------------
> // For context mode
> //----------------------------------------------------------
>
> -@...ends on context@
> -type T;
> +@...ipt:python depends on context@
> +t << r1.T;
> +@@
> +
> +if m.search(t) != None:
> + cocci.include_match(False)
> +
> +@...ends on context && r1@
> +type r1.T;
> @@
>
> * (T *)
> \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
> - kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\)(...)
> + kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\|
> + dma_alloc_coherent\|dma_zalloc_coherent\|devm_kmalloc\|devm_kzalloc\|
> + kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\|
> + pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\|
> + kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...)
>
> //----------------------------------------------------------
> // For patch mode
> //----------------------------------------------------------
>
> -@...ends on patch@
> -type T;
> +@...ipt:python depends on patch@
> +t << r1.T;
> +@@
> +
> +if m.search(t) != None:
> + cocci.include_match(False)
> +
> +@...ends on patch && r1@
> +type r1.T;
> @@
>
> - (T *)
> - (\(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
> - kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\)(...))
> + \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
> + kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\|
> + dma_alloc_coherent\|dma_zalloc_coherent\|devm_kmalloc\|devm_kzalloc\|
> + kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\|
> + pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\|
> + kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...)
>
> //----------------------------------------------------------
> // For org and report mode
> //----------------------------------------------------------
>
> -@r depends on org || report@
> +@r2 depends on org || report@
> type T;
> position p;
> @@
>
> - (T@p *)\(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
> - kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\)(...)
> + (T@p *)
> + \(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
> + kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\|vmalloc\|vzalloc\|
> + dma_alloc_coherent\|dma_zalloc_coherent\|devm_kmalloc\|devm_kzalloc\|
> + kvmalloc\|kvzalloc\|kvmalloc_node\|kvzalloc_node\|pci_alloc_consistent\|
> + pci_zalloc_consistent\|kmem_alloc\|kmem_zalloc\|kmem_zone_alloc\|
> + kmem_zone_zalloc\|vmalloc_node\|vzalloc_node\)(...)
>
> @script:python depends on org@
> -p << r.p;
> -t << r.T;
> +p << r2.p;
> +t << r2.T;
> @@
>
> -coccilib.org.print_safe_todo(p[0], t)
> +if m.search(t) != None:
> + cocci.include_match(False)
> +else:
> + coccilib.org.print_safe_todo(p[0], t)
>
> @script:python depends on report@
> -p << r.p;
> -t << r.T;
> +p << r2.p;
> +t << r2.T;
> @@
>
> -msg="WARNING: casting value returned by memory allocation function to (%s *) is useless." % (t)
> -coccilib.report.print_report(p[0], msg)
> -
> -
> +if m.search(t) != None:
> + cocci.include_match(False)
> +else:
> + msg="WARNING: casting value returned by memory allocation function to (%s *) is useless." % (t)
> + coccilib.report.print_report(p[0], msg)
> --
> 2.7.4
>
>
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