linux-kernel - Re: [PATCH v7u1 22/31] x86, boot: add fields to support load bzImage and ramdisk above 4G

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Date:	Tue, 15 Jan 2013 17:48:43 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kiszka <jan.kiszka@....de>,
	Jason Wessel <jason.wessel@...driver.com>,
	linux-kernel@...r.kernel.org, Rob Landley <rob@...dley.net>,
	Matt Fleming <matt.fleming@...el.com>,
	Gokul Caushik <caushik1@...il.com>,
	Josh Triplett <josh@...htriplett.org>,
	Joe Millenbach <jmillenbach@...il.com>
Subject: Re: [PATCH v7u1 22/31] x86, boot: add fields to support load bzImage
 and ramdisk above 4G

On Tue, Jan 15, 2013 at 08:03:49AM -0800, Yinghai Lu wrote:
> Come on, are you serious? almost none?

Of course I'm serious - the fact that I'm diddling with your patchset
for weeks now should tell you I'm f*cking serious about this.

> I took the comments about sentinel.
> but did not take your comments about change kernel_ident_mapping_init.

Because... ? I saw that you didn't take it but why, you didn't even say
why you didn't take it. And I asked you at the beginning: should we
review this patchset or do you simply ignore comments.

Let's see:

* [PATCH 06/31] x86, 64bit, realmode: use init_level4_pgt to set trapmoline_pgt directly
	- typo still there

* [PATCH 08/31] x86, 64bit: early #PF handler set page table
	- almost no changes, SOB chain still wrong

* [PATCH 12/31] x86: add get_ramdisk_image/size()
	- no change

* [PATCH 13/31] x86, boot: add get_cmd_line_ptr()
	- no change

* [PATCH 14/31] x86, boot: move checking of cmd_line_ptr out of common path
	- no change

* [PATCH 20/31] x86, kexec: replace ident_mapping_init and init_level4_page
	- no change

* [PATCH 21/31] x86, kexec: only set ident mapping for ram.
	- almost

* [PATCH 22/31] x86, boot: add fields to support load bzImage and ramdisk above 4G
	- except sentinel, almost no change

* [PATCH 23/31] x86, boot: update comments about entries for 64bit image
	- almost no change

How's that for "almost none"?!

Oh, and also, some of the suggestions you've taken but then changed
again making them wrong. Here's an example:

Your initial change had:

> +The memory for struct boot_params should be allocated under or above
> +4G and initialized to all zero.

I suggested:

"Memory for struct boot_params may be allocated anywhere (even above
4G). This memory must be zeroed out."

You changed it to:

"The memory for struct boot_params could be allocated anywhere (even
above 4G) and initialized to all zero."

which still reads funny and has a couple of issues.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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