linux-kernel - Re: [Cocci] [PATCH] coccinelle: add patch rule for dma_alloc_coherent

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Date:   Fri, 21 Aug 2020 17:37:20 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Alex Dewar <alex.dewar90@...il.com>
cc:     Gilles Muller <Gilles.Muller@...6.fr>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Michal Marek <michal.lkml@...kovi.net>,
        Luis Chamberlain <mcgrof@...nel.org>, cocci@...teme.lip6.fr,
        linux-kernel@...r.kernel.org
Subject: Re: [Cocci] [PATCH] coccinelle: add patch rule for
 dma_alloc_coherent

On Fri, 21 Aug 2020, Alex Dewar wrote:

> Commit dfd32cad146e ("dma-mapping: remove dma_zalloc_coherent()")
> removed the definition of dma_zalloc_coherent() and also removed the
> corresponding patch rule for replacing instances of dma_alloc_coherent +
> memset in zalloc-simple.cocci (though left the report rule).
>
> Add a new patch rule to remove unnecessary calls to memset after
> allocating with dma_alloc_coherent. While we're at it, fix a couple of
> typos.

Applied, thanks!

julia

>
> Fixes: dfd32cad146e ("dma-mapping: remove dma_zalloc_coherent()")
> Signed-off-by: Alex Dewar <alex.dewar90@...il.com>
> ---
>  scripts/coccinelle/api/alloc/zalloc-simple.cocci | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/scripts/coccinelle/api/alloc/zalloc-simple.cocci b/scripts/coccinelle/api/alloc/zalloc-simple.cocci
> index 26cda3f48f01..b3d0c3c230c1 100644
> --- a/scripts/coccinelle/api/alloc/zalloc-simple.cocci
> +++ b/scripts/coccinelle/api/alloc/zalloc-simple.cocci
> @@ -127,6 +127,16 @@ statement S;
>    if ((x==NULL) || ...) S
>  - memset((T2)x,0,E1);
>
> +@...ends on patch@
> +type T, T2;
> +expression x;
> +expression E1,E2,E3,E4;
> +statement S;
> +@@
> +  x = (T)dma_alloc_coherent(E1, E2, E3, E4);
> +  if ((x==NULL) || ...) S
> +- memset((T2)x, 0, E2);
> +
>  //----------------------------------------------------------
>  //  For org mode
>  //----------------------------------------------------------
> @@ -199,9 +209,9 @@ statement S;
>  position p;
>  @@
>
> - x = (T)dma_alloc_coherent@p(E2,E1,E3,E4);
> + x = (T)dma_alloc_coherent@p(E1,E2,E3,E4);
>   if ((x==NULL) || ...) S
> - memset((T2)x,0,E1);
> + memset((T2)x,0,E2);
>
>  @script:python depends on org@
>  p << r2.p;
> @@ -217,7 +227,7 @@ p << r2.p;
>  x << r2.x;
>  @@
>
> -msg="WARNING: dma_alloc_coherent use in %s already zeroes out memory,  so memset is not needed" % (x)
> +msg="WARNING: dma_alloc_coherent used in %s already zeroes out memory, so memset is not needed" % (x)
>  coccilib.report.print_report(p[0], msg)
>
>  //-----------------------------------------------------------------
> --
> 2.28.0
>
> _______________________________________________
> Cocci mailing list
> Cocci@...teme.lip6.fr
> https://systeme.lip6.fr/mailman/listinfo/cocci
>

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