> From: Andrew Morton
> Newsgroups: gmane.linux.raid,gmane.linux.kernel
> Subject: Re: [PATCH 006 of 6] md: Add support for reshape of a raid6
> Date: Wed, 21 Feb 2007 14:48:06 -0800
Hallo.
> On Tue, 20 Feb 2007 17:35:16 +1100
> NeilBrown <neilb@xxxxxxx> wrote:
>
>> + for (i = conf->raid_disks ; i-- ; ) {
>
> That statement should be dragged out, shot, stomped on then ceremonially
> incinerated.
>
> What's wrong with doing
>
> for (i = 0; i < conf->raid_disks; i++) {
>
> in a manner which can be understood without alcoholic fortification?
>
> ho hum.
In case someone likes to do job, GCC usually ought to do, i would
suggest something like this instead:
if (expanded && test_bit(STRIPE_EXPANDING, &sh->state)) {
/* Need to write out all blocks after computing P&Q */
- sh->disks = conf->raid_disks;
+ i = conf->raid_disks;
+ sh->disks = i;
- sh->pd_idx = stripe_to_pdidx(sh->sector, conf,
- conf->raid_disks);
+ sh->pd_idx = stripe_to_pdidx(sh->sector, conf, i);
compute_parity6(sh, RECONSTRUCT_WRITE);
- for (i = conf->raid_disks ; i-- ; ) {
+ do {
set_bit(R5_LOCKED, &sh->dev[i].flags);
locked++;
set_bit(R5_Wantwrite, &sh->dev[i].flags);
- }
+ } while (--i);
clear_bit(STRIPE_EXPANDING, &sh->state);
} else if (expanded) {
In any case this is subject of scripts/bloat-o-meter.
____
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