linux-kernel - Re: [PATCH] Coccinelle: Script to use roundup and DIV_ROUND

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Date:	Thu, 14 Jul 2016 19:01:26 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Amitoj Kaur Chawla <amitoj1606@...il.com>
cc:	Julia.Lawall@...6.fr, Gilles.Muller@...6.fr, nicolas.palix@...g.fr,
	mmarek@...e.com, cocci@...teme.lip6.fr,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Coccinelle: Script to use roundup and DIV_ROUND_UP



On Thu, 14 Jul 2016, Amitoj Kaur Chawla wrote:

> This script replaces manual calculations by using the predefined
> macros in kernel.h, DIV_ROUND_UP and roundup for readability purposes.
>
> Signed-off-by: Amitoj Kaur Chawla <amitoj1606@...il.com>

Acked-by: Julia Lawall <julia.lawall@...6.fr>


> ---
>  scripts/coccinelle/api/roundup.cocci | 215 +++++++++++++++++++++++++++++++++++
>  1 file changed, 215 insertions(+)
>  create mode 100644 scripts/coccinelle/api/roundup.cocci
>
> diff --git a/scripts/coccinelle/api/roundup.cocci b/scripts/coccinelle/api/roundup.cocci
> new file mode 100644
> index 0000000..af97cd2
> --- /dev/null
> +++ b/scripts/coccinelle/api/roundup.cocci
> @@ -0,0 +1,215 @@
> +/// Use DIV_ROUND_UP and roundup to improve readability
> +///
> +// Confidence: High
> +// Copyright: (C) 2016 Amitoj Kaur Chawla
> +
> +virtual patch
> +virtual context
> +virtual org
> +virtual report
> +
> +@...kernel@
> +@@
> +
> +#include <linux/kernel.h>
> +
> +@...nd1 depends on haskernel && patch && !context && !org && !report@
> +expression x, y;
> +@@
> +
> +(
> +- (((x + (y - 1)) / y) * y)
> ++ roundup(x, y)
> +|
> +- (((x + y - 1) / y) * y)
> ++ roundup(x, y)
> +)
> +
> +@...nd2 depends on haskernel && patch && !context && !org && !report
> + disable paren@
> +expression x, y;
> +@@
> +
> +- roundup((x), y)
> ++ roundup(x, y)
> +
> +@...nd3 depends on haskernel && patch && !context && !org && !report
> + disable paren@
> +expression x, y;
> +@@
> +
> +- roundup(x, (y))
> ++ roundup(x, y)
> +
> +@...nd4 depends on haskernel && patch && !context && !org && !report@
> +expression n,d;
> +@@
> +
> +(
> +- ((n + d - 1) / d)
> ++ DIV_ROUND_UP(n,d)
> +|
> +- ((n + (d - 1)) / d)
> ++ DIV_ROUND_UP(n,d)
> +)
> +
> +@...nd5 depends on haskernel && patch && !context && !org && !report
> + disable paren@
> +expression n,d;
> +@@
> +
> +- DIV_ROUND_UP((n),d)
> ++ DIV_ROUND_UP(n,d)
> +
> +@...nd6 depends on haskernel && patch && !context && !org && !report
> + disable paren@
> +expression n,d;
> +@@
> +
> +- DIV_ROUND_UP(n,(d))
> ++ DIV_ROUND_UP(n,d)
> +
> +// ----------------------------------------------------------------------------
> +
> +@...nd1_context depends on haskernel && !patch && (context || org || report)@
> +expression e, x, y;
> +position j,j0;
> +@@
> +
> +(
> +*  (((x@j + (y - 1)) / y) *@e@j0 y)
> +|
> +*  (((x@j + y - 1) / y) *@e@j0 y)
> +)
> +
> +@...nd2_context depends on haskernel && !patch && (context || org || report)
> + disable paren@
> +expression x, y;
> +position j0;
> +@@
> +
> +*  roundup@j0((x), y)
> +
> +@...nd3_context depends on haskernel && !patch && (context || org || report)
> + disable paren@
> +expression x, y;
> +position j0;
> +@@
> +
> +*  roundup@j0(x, (y))
> +
> +@...nd4_context depends on haskernel && !patch && (context || org || report)@
> +expression e, d, n;
> +position j!=round1_context.j;
> +position j0;
> +@@
> +
> +(
> +*  ((n@j + d - 1) /@e@j0 d)
> +|
> +*  ((n@j + (d - 1)) /@e@j0 d)
> +)
> +
> +@...nd5_context depends on haskernel && !patch && (context || org || report)
> + disable paren@
> +expression d, n;
> +position j0;
> +@@
> +
> +*  DIV_ROUND_UP@j0((n),d)
> +
> +@...nd6_context depends on haskernel && !patch && (context || org || report)
> + disable paren@
> +expression d, n;
> +position j0;
> +@@
> +
> +*  DIV_ROUND_UP@j0(n,(d))
> +
> +// ----------------------------------------------------------------------------
> +
> +@...ipt:python round1_org depends on org@
> +j0 << round1_context.j0;
> +@@
> +
> +msg = "WARNING: Replace with roundup."
> +coccilib.org.print_todo(j0[0], msg)
> +
> +@...ipt:python round2_org depends on org@
> +j0 << round2_context.j0;
> +@@
> +
> +msg = "WARNING: Unneeded parentheses in the first argument of roundup."
> +coccilib.org.print_todo(j0[0], msg)
> +
> +@...ipt:python round3_org depends on org@
> +j0 << round3_context.j0;
> +@@
> +
> +msg = "WARNING: Unneeded parentheses in the second argument of roundup."
> +coccilib.org.print_todo(j0[0], msg)
> +
> +@...ipt:python round4_org depends on org@
> +j0 << round4_context.j0;
> +@@
> +
> +msg = "WARNING: Replace with DIV_ROUND_UP."
> +coccilib.org.print_todo(j0[0], msg)
> +
> +@...ipt:python round5_org depends on org@
> +j0 << round5_context.j0;
> +@@
> +
> +msg = "WARNING: Unneeded parentheses in the first argument of DIV_ROUND_UP."
> +coccilib.org.print_todo(j0[0], msg)
> +
> +@...ipt:python round6_org depends on org@
> +j0 << round6_context.j0;
> +@@
> +
> +msg = "WARNING: Unneeded parentheses in the second argument of DIV_ROUND_UP."
> +coccilib.org.print_todo(j0[0], msg)
> +
> +// ----------------------------------------------------------------------------
> +
> +@...ipt:python round1_report depends on report@
> +j0 << round1_context.j0;
> +@@
> +
> +msg = "WARNING: Replace with roundup."
> +coccilib.report.print_report(j0[0], msg)
> +
> +@...ipt:python round2_report depends on report@
> +j0 << round2_context.j0;
> +@@
> +
> +msg = "WARNING: Unneeded parentheses in the first argument of roundup."
> +coccilib.report.print_report(j0[0], msg)
> +
> +@...ipt:python round3_report depends on report@
> +j0 << round3_context.j0;
> +@@
> +
> +msg = "WARNING: Unneeded parentheses in the second argument of roundup."
> +coccilib.report.print_report(j0[0], msg)
> +
> +@...ipt:python round4_report depends on report@
> +j0 << round4_context.j0;
> +@@
> +
> +msg = "WARNING: Replace with DIV_ROUND_UP."
> +coccilib.report.print_report(j0[0], msg)
> +
> +@...ipt:python round5_report depends on report@
> +j0 << round5_context.j0;
> +@@
> +
> +msg = "WARNING: Unneeded parentheses in the first argument of DIV_ROUND_UP."
> +coccilib.report.print_report(j0[0], msg)
> +
> +@...ipt:python round6_report depends on report@
> +j0 << round6_context.j0;
> +@@
> +
> +msg = "WARNING: Unneeded parentheses in the second argument of DIV_ROUND_UP."
> +coccilib.report.print_report(j0[0], msg)
> --
> 1.9.1
>
>