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Re: [git pull] x86 PAT changes

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From: Linus Torvalds <torvalds@...>
To: Ingo Molnar <mingo@...>
Cc: <linux-kernel@...>, Andrew Morton <akpm@...>, H. Peter Anvin <hpa@...>, Thomas Gleixner <tglx@...>
Subject: Re: [git pull] x86 PAT changes
Date: Friday, April 25, 2008 - 7:43 pm

On Fri, 25 Apr 2008, Ingo Molnar wrote:

So why is PAT dependent on NONPROMISC_DEVMEM here?

It seems pointless and wrong. Somebody might want to have both the full 
/dev/mem and PAT.

Also, it causes this message for me on one of my machines:

	EXT3-fs: mounted filesystem with ordered data mode.
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0400000
	mtrr: no more MTRRs available
	Overlap at 0xd0000000-0xe0000000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0380000
	EXT3 FS on dm-0, internal journal
	...
	eth0: no IPv6 routers present
	Overlap at 0xd0000000-0xe0000000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0380000
	Overlap at 0xd0000000-0xe0000000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0380000
	Overlap at 0xd0000000-0xe0000000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0380000
	Overlap at 0xd0000000-0xe0000000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0380000
	Overlap at 0xd0000000-0xe0000000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0380000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xd0000000-0xd0020000
	mtrr: no more MTRRs available
	Overlap at 0xd0000000-0xe0000000
	Overlap at 0xe0300000-0xe0400000
	Overlap at 0xe0300000-0xe0380000

which is a bit annoying. Forgotten debug printk, perhaps?

			Linus
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Messages in current thread:
[git pull] x86 PAT changes, Ingo Molnar, (Thu Apr 24, 6:56 pm)
Re: [git pull] x86 PAT changes, Gabriel C, (Sat Apr 26, 9:40 am)
Re: [git pull] x86 PAT changes, Ingo Molnar, (Sat Apr 26, 10:42 am)
Re: [git pull] x86 PAT changes, Gabriel C, (Sat Apr 26, 11:37 am)
Re: [git pull] x86 PAT changes, Ingo Molnar, (Sat Apr 26, 11:41 am)
Re: [git pull] x86 PAT changes, Linus Torvalds, (Sat Apr 26, 12:43 pm)
Re: [git pull] x86 PAT changes, Linus Torvalds, (Fri Apr 25, 7:43 pm)
Re: [git pull] x86 PAT changes, Ingo Molnar, (Sat Apr 26, 5:57 am)
Re: [git pull] x86 PAT changes, H. Peter Anvin, (Fri Apr 25, 8:06 pm)
Re: [git pull] x86 PAT changes, Linus Torvalds, (Fri Apr 25, 9:12 pm)
Re: [git pull] x86 PAT changes, Ingo Molnar, (Sat Apr 26, 4:56 am)
RE: [git pull] x86 PAT changes, Pallipadi, Venkatesh, (Sat Apr 26, 12:54 pm)
RE: [git pull] x86 PAT changes, Linus Torvalds, (Sat Apr 26, 1:15 pm)
Re: [git pull] x86 PAT changes, Venki Pallipadi, (Sat Apr 26, 2:32 pm)
[patch] x86, PAT: disable /dev/mem mmap RAM with PAT, Ingo Molnar, (Sat Apr 26, 3:07 pm)