linux-kernel - Re: [PATCH 5/5] lockdep: pack subclass/trylock/read/check into a single argument

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Date:	Tue, 21 Jan 2014 21:06:03 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Dave Jones <davej@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] lockdep: pack subclass/trylock/read/check into a
	single argument

On 01/21, Steven Rostedt wrote:
>
> On Tue, 21 Jan 2014 19:43:10 +0100
> Oleg Nesterov <oleg@...hat.com> wrote:
>
> > Do you mean __attribute__((packed)) ?
>
> I think Dave means:
>
> 	unsigned char subclass	: 3;
> 	unsigned char trylock	: 1;
> 	unsigned char read	: 2;
> 	unsigned char check	: 1;

Ah, yes. But I don't think this will change the code generation.

Oleg.

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