linux-kernel - Re: [tip:efi/core] x86/mm/pat: Use _PAGE_GLOBAL bit for EFI page table mappings

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Date:	Tue, 23 Feb 2016 10:08:06 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"Ravi V. Shankar" <ravi.v.shankar@...el.com>,
	Toshi Kani <toshi.kani@...com>,
	Brian Gerst <brgerst@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
	Luis Rodriguez <mcgrof@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>, ricardo.neri@...el.com,
	Hugh Dickins <hughd@...gle.com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [tip:efi/core] x86/mm/pat: Use _PAGE_GLOBAL bit for EFI page
 table mappings

On Tue, Feb 23, 2016 at 9:47 AM, Andy Lutomirski <luto@...capital.net> wrote:
> On Feb 23, 2016 1:09 AM, <&quot;tip-bot for Sai Praneeth
> &lt;tipbot@...or.com&gt;&quot;@zytor.com> wrote:
>
> Something's wrong with tip-bot.  This should say:

Yeah, there's about 50 tipbot emails that are just pure garbage. They
don't even show in my mailers, because they are so corrupt.

The raw email has some insane encoding too, for reasons I can't begin to fathom.

This is an example of what tipbot *used* to send out in the headers:

  From: tip-bot for Dave Hansen <tipbot@...or.com>
  Subject: [tip:mm/pkeys] mm/core, x86/mm/pkeys:
    Add execute-only protection keys support

and this is what it sent out in the last crazy setup:

  From:   =?UTF-8?B?dGlwLWJvdCBmb3IgU2FpIFByYW5lZXRoIDx0aXBib3RAenl0b3IuY29tPg==?=@...or.com
  Subject:
   =?UTF-8?B?W3RpcDplZmkvY29yZV0geDg2L21tL3BhdDogVXNlIF9QQUdFX0dMT0JBTCBiaXQ=?=
   =?UTF-8?B?IGZvciBFRkkgcGFnZSB0YWJsZSBtYXBwaW5ncw==?=

despite neither subject nor author having any odd characters in them.

(That's just two header lines - all the other ones are corrupt in
similar ways too)

The thing that seems to really make things unreadable is that the
content encoding lines have this corrupted quoting too:

  MIME-Version: =?UTF-8?B?MS4w?=
  Content-Transfer-Encoding: =?UTF-8?B?OGJpdA==?=
  Content-Type: =?UTF-8?B?dGV4dC9wbGFpbjsgY2hhcnNldD1VVEYtOA==?=
  Content-Disposition: =?UTF-8?B?aW5saW5l?=

rather than what it *should* be:

  Content-Transfer-Encoding: 8bit
  Content-Type: text/plain; charset=UTF-8
  Content-Disposition: inline

so the whole header situation is a complete mess.

The fact that you can see the patch at all and comment on the
*contents* of the email is impressive. My mail reader just says "this
is garbage" and shows me nothing at all.

               Linus