linux-kernel - Re: [PATCH] ftrace: return error instead of 12 bytes read

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Date:	Thu, 12 Nov 2009 13:31:34 +0000
From:	Andy Whitcroft <apw@...onical.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Roel Kluin <roel.kluin@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, ingo <mingo@...e.hu>,
	rostedt@...dmis.org, apw@...onical.com
Subject: Re: [PATCH] ftrace: return error instead of 12 bytes read

>>       s = kmalloc(sizeof(*s), GFP_KERNEL);
>>       if (!s)
>> -             return ENOMEM;
>> +             return -ENOMEM;
>>
>>       trace_seq_init(s);
>>
>
> lol, there we go again.
>
> Andy, can we have a checkpatch rule please?

Thats a tricky one.  Not only do we not really have a sensible way to
know if ENOMEM is an errno, we also find a bunch of places that we
appear to use positive errno's as return values where we would falsly
complain about.  Its particularly common in scsi and filesystems.
Admittedly the vast majority are return -EXXX form, so we could add
this as a non-default check perhaps.

Thoughts?

-apw
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