linux-kernel - Re: [PATCH 0/2] ARM: omap2+: omap_hwmod: Fix false lockdep warning

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Date:	Fri, 6 Feb 2015 19:32:05 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	Tony Lindgren <tony@...mide.com>, paul@...an.com,
	linux-omap@...r.kernel.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org, balbi@...com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/2] ARM: omap2+: omap_hwmod: Fix false lockdep warning

On Fri, Feb 06, 2015 at 06:05:32PM +0200, Peter Ujfalusi wrote:
> Certainly looks much simpler, but it adds quite a bit of data to the
> omap_hwmod struct, and we have a _lot_ of them for omap2plus configuration.
> 
> ls -al vmlinux
> 
> w/o any the lockdep warning fixes:
> 110109168
> 
> With my series applied:
> 110112031 (base + 2863)
> 
> With setting individual lockdep class:
> 110114275 (base + 5107)
> 
> I certainly like the lockdep_set_class() way since it is cleaner, but it adds
> almost double amount of bytes to the kernel.

Yeah, I've never really bothered with data too much, its a debug
feature. So lock_class_key is 8 bytes, and strictly speaking you could
union them over other fields, all we really need is unique addresses, we
don't actually use the storage.
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