linux-kernel - Re: [PATCH 1/1] irq-gic: use BUG

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Date:	Mon, 22 Jun 2015 13:05:12 +0000 (GMT)
From:	Maninder Singh <maninder1.s@...sung.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Jason Cooper <jason@...edaemon.net>,
	LKML <linux-kernel@...r.kernel.org>,
	PANKAJ MISHRA <pankaj.m@...sung.com>,
	Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH 1/1] irq-gic: use BUG_ON instead of if()/BUG

Hi Thomas,

Thanks For your suggestions.

> >Further, while we are at that. It would be even more useful to analyze
> >whether the BUG_ON() is needed in the first place or at least could be
> >made conditional on some debug option.
> >
> >But that's not done by the script either, right?
>> 
>> Yes coccinelle semantic patches did not do that changes.
>> we have to choose whether to make BUG_ON conditional on some debug options.
>
>Right, and that's what I'm asking for. IOW, instead of blindly running
>scripts at least ask the question whether this stuff needs to be there
>unconditionally....

And I checked for these if()/BUG, I think we don't even need these if()/BUG constructs in codes.
For below 4 functions.
1. gic_dist_save
2. gic_dist_restore
3. gic_cpu_save
4. gic_cpu_restore

As we are checking in loop for (i = 0; i < MAX_GIC_NR; i++)
and passing i as gic_nr.  So below condition never returns true for any case, i think
 if (gic_nr >= MAX_GIC_NR).

So we can remove if/BUG constructs from these functions ??

5. gic_migrate_target 
And also in gic_migrate_target , we initializing gic_nr = 0;
and then checking whether gic_nr >= MAX_GIC_NR.

6. gic_cascade_irq
Before calling this function we have checked the same condition in gic_init_bases

So we can also remove if()/BUG from these functions also ?

Thanks ,
Maninder