linux-kernel - Re: [PATCH][V2] libata: make const arrays static, reduces object code size

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Date:   Mon, 18 Sep 2017 19:54:35 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Colin King <colin.king@...onical.com>, Tejun Heo <tj@...nel.org>,
        Mark Fasheh <mfasheh@...sity.com>,
        Joel Becker <jlbec@...lplan.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        piaojun <piaojun@...wei.com>, linux-ide@...r.kernel.org,
        ocfs2-devel@....oracle.com
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][V2] libata: make const arrays static, reduces object code
 size

Hello!

On 09/18/2017 04:32 PM, Colin King wrote:

> From: Colin Ian King <colin.king@...onical.com>
> 
> Don't populate const arrays on the stack, instead make them static.
> Makes the object code smaller by over 260 bytes:
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>   drivers/ata/libata-scsi.c  | 10 +++++-----
>   fs/ocfs2/dlm/dlmrecovery.c |  1 -
>   2 files changed, 5 insertions(+), 6 deletions(-)
[...]
> diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
> index 74407c6dd592..31a61e8e0152 100644
> --- a/fs/ocfs2/dlm/dlmrecovery.c
> +++ b/fs/ocfs2/dlm/dlmrecovery.c
> @@ -1129,7 +1129,6 @@ static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
>   		(mres->num_locks * sizeof(struct dlm_migratable_lock));
>   
>   	/* add an all-done flag if we reached the last lock */
> -	orig_flags = mres->flags;

    What's that? :-/

>   	BUG_ON(total_locks > mres_total_locks);
>   	if (total_locks == mres_total_locks)
>   		mres->flags |= DLM_MRES_ALL_DONE;

MBR, Sergei