linux-kernel - Re: [Patch v2 1/2] lustre: Parantheses added for Macro argument to avoid precedence issues

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Date:   Sat, 15 Apr 2017 13:48:51 +0200
From:   "greg@...ah.com" <greg@...ah.com>
To:     Rishiraj Manwatkar <manwatkar@...look.com>
Cc:     "lustre-devel@...ts.lustre.org" <lustre-devel@...ts.lustre.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "andreas.dilger@...el.com" <andreas.dilger@...el.com>,
        "oleg.drokin@...el.com" <oleg.drokin@...el.com>
Subject: Re: [Patch v2 1/2] lustre: Parantheses added for Macro argument to
 avoid precedence issues

On Sat, Apr 15, 2017 at 11:25:00AM +0000, Rishiraj Manwatkar wrote:
> From: RishirajAM <manwatkar@...look.com>
> 
> Parantheses are added for Macro argument, to avoid precedence issues.
> 
> Signed-off-by: Rishiraj Manwatkar <manwatkar@...look.com>
> ---
>  drivers/staging/lustre/lustre/obdclass/cl_io.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

What changed from v1?  Always put that below the --- line.

And your From: line doesn't match your signed-off-by name, that's not
ok.

> 
> diff --git a/drivers/staging/lustre/lustre/obdclass/cl_io.c b/drivers/staging/lustre/lustre/obdclass/cl_io.c
> index ee7d677..0997254 100755
> --- a/drivers/staging/lustre/lustre/obdclass/cl_io.c
> +++ b/drivers/staging/lustre/lustre/obdclass/cl_io.c
> @@ -52,9 +52,9 @@
>   */
>  
>  #define cl_io_for_each(slice, io) \
> -	list_for_each_entry((slice), &io->ci_layers, cis_linkage)
> +	list_for_each_entry((slice), &(io)->ci_layers, cis_linkage)

What 'precidence' issue is this fixing?  How could that ever be
incorrect?

Really, this macro just needs to go away and be used "as is" anyway...

thanks,

greg k-h