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From: "H. Peter Anvin" <hpa@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "H. Peter Anvin" <hpa@linux.intel.com>,
	stable@kernel.org, Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Avi Kivity <avi@redhat.com>, Brian Gerst <brgerst@gmail.com>,
	Glauber Costa <glommer@redhat.com>, Greg KH <gregkh@suse.de>,
	Ingo Molnar <mingo@elte.hu>, Jeff Dike <jdike@addtoit.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	Pekka Enberg <penberg@cs.helsinki.fi>,
	Peter Palfrader <peter@palfrader.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Zachary Amsden <zamsden@redhat.com>
Subject: Re: [GIT PULL] x86/asm for 2.6.36
Date: Fri, 06 Aug 2010 11:03:38 -0700	[thread overview]
Message-ID: <4C5C4E7A.8040603@kernel.org> (raw)
In-Reply-To: <4C5C4A23.6070006@zytor.com>

On 08/06/2010 10:45 AM, H. Peter Anvin wrote:
> 
> It's worth noting that in this particular case the code itself looks
> like this:
> 
> 	set_64bit((unsigned long *)&irte->low, irte_modified->low);
> 	set_64bit((unsigned long *)&irte->high, irte_modified->high);
> 
> ... where the existing cast is there because irte->low and irte->high
> are types __u64.  In other words, with the "more logical" u64 prototype
> the casts should just get removed.
> 

Looking through the build I'm currently running, so far, it is smoking
out a bunch of unnecessary casts and wrappers, for example, in kvm/mmu.c:

static void __set_spte(u64 *sptep, u64 spte)
{
#ifdef CONFIG_X86_64
	set_64bit((unsigned long *)sptep, spte);
#else
	set_64bit((unsigned long long *)sptep, spte);
#endif
}

... which just becomes the much cleaner ...

static void __set_spte(u64 *sptep, u64 spte)
{
	set_64bit(sptep, spte);
}

I'll go through all these as this build finishes and give you an updated
tree to pull, ok?

	-hpa

      parent reply	other threads:[~2010-08-06 18:10 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-08-05 20:37 [GIT PULL] x86/asm for 2.6.36 H. Peter Anvin
2010-08-06 17:17 ` Linus Torvalds
2010-08-06 17:45   ` H. Peter Anvin
2010-08-06 17:56     ` Linus Torvalds
2010-08-06 18:03     ` H. Peter Anvin [this message]

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