linux-kernel - Re: [PATCH] ia64: fix getpid and set_tid_address fast system calls for pid namespaces

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Date:	Fri, 7 Mar 2008 06:51:20 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	Pavel Emelyanov <xemul@...nvz.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Luck, Tony" <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ia64: fix getpid and set_tid_address fast system calls for pid namespaces

On Fri, Mar 07, 2008 at 04:23:13PM +0300, Pavel Emelyanov wrote:
> @@ -34,6 +35,9 @@
>  	DEFINE(SIGFRAME_SIZE, sizeof (struct sigframe));
>  	DEFINE(UNW_FRAME_INFO_SIZE, sizeof (struct unw_frame_info));
>  
> +	BUILD_BUG_ON(sizeof(struct upid) != 32);
> +	DEFINE(IA64_UPID_SHIFT, 5);
> +
>  	BLANK();
>  
>  	DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));

This might work better with ilog2().  Something like this perhaps?

	BUILD_BUG_ON(!is_power_of_2(sizeof(struct upid)))
	DEFINE(IA64_UPID_SHIFT, ilog2(sizeof(struct upid)))

-- 
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