linux-kernel - Re: [PATCH 2/3] x86/mce: Pack boolean MCE flags into a structure

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Date:	Wed, 05 Sep 2012 10:15:22 -0700
From:	Joe Perches <joe@...ches.com>
To:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:	tony.luck@...el.com, andi@...stfloor.org, bp@...64.org,
	gong.chen@...ux.intel.com, ananth@...ibm.com, x86@...nel.org,
	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	tglx@...utronix.de, gregkh@...e.de, linux-edac@...r.kernel.org
Subject: Re: [PATCH 2/3] x86/mce: Pack boolean MCE flags into a structure

On Wed, 2012-09-05 at 15:52 +0530, Naveen N. Rao wrote:
> Many MCE flags are boolean in nature, but are declared as integers
> currently. We can pack these into a bitfield to save some space.
[]
> diff --git a/arch/x86/kernel/cpu/mcheck/mce-internal.h b/arch/x86/kernel/cpu/mcheck/mce-internal.h
[]
> @@ -11,6 +11,15 @@ enum severity_level {
>  	MCE_PANIC_SEVERITY,
>  };
>  
> +struct mce_config {
> +	__u32	cmci_disabled		: 1,
> +		ignore_ce		: 1,
> +		dont_log_ce		: 1,
> +		__pad			: 29;

You don't need to declare __pad
Perhaps bool:1 instead.

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