linux-kernel - Re: [PATCH 0/10] Use ARRAY_SIZE macro

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Message-ID: <20170903194605.qh6k3fthcc6qevpn@olymp>
Date:   Sun, 3 Sep 2017 21:59:37 +0200
From:   Thomas Meyer <thomas@...3r.de>
To:     Joe Perches <joe@...ches.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/10] Use ARRAY_SIZE macro - v4.13-rc7

On Sun, Sep 03, 2017 at 08:36:02AM -0700, Joe Perches wrote:
> On Sun, 2017-09-03 at 14:19 +0200, Thomas Meyer wrote:
> > Use ARRAY_SIZE macro, rather than explicitly coding some variant of it
> > yourself.
> > 
> > Found with: find -type f -name "*.c" -o -name "*.h" | xargs perl -p -i -e
> > 's/\bsizeof\s*\(\s*(\w+)\s*\)\s*\ /\s*sizeof\s*\(\s*\1\s*\[\s*0\s*\]\s*\)
> > /ARRAY_SIZE(\1)/g' and manual check/verification.
> 
> Hey Thomas.

Hi Joe,
> 
> There are some instances that span multiple lines that
> the regex above misses.
> 
> For instance:
> 
> diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c
> index 3d701c7a4c91..26a825bd7581 100644
> --- a/drivers/infiniband/hw/mlx5/odp.c
> +++ b/drivers/infiniband/hw/mlx5/odp.c
> @@ -929,8 +929,7 @@ static int mlx5_ib_mr_initiator_pfault_handler(
>                 return -EFAULT;
>         }
>  
> -       if (unlikely(opcode >= sizeof(mlx5_ib_odp_opcode_cap) /
> -           sizeof(mlx5_ib_odp_opcode_cap[0]) ||
> +       if (unlikely(opcode >= ARRAY_SIZE(mlx5_ib_odp_opcode_cap) ||
> 
> Here is another perl command regex that fixes a few more:
> 
> $ perl -i -e 'local $/; while (<>) { s/\bsizeof\s*\(\s*(\w+)\s*\)\s*\/\s*sizeof\s*\(\s*\1\s*\[\s*0\s*\]\s*\)/ARRAY_SIZE(\1)/g; print; }' $file
> 
> This regex could still miss variants that
> have a comment or that don't use parentheses
> around the sizeof.

Okay, fine, but I think this patch series is okay to go in anyway. I will
re-run with above regex after the next rcX tag. Would that be fine for you?
What do you think?

> 
> It seems none of those styles exist though.
>