linux-kernel - Re: [stable] [patch 44/47] pxamci: fix byte aligned DMA transfers

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Date:	Thu, 24 Jul 2008 12:22:56 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	pHilipp Zabel <philipp.zabel@...il.com>
cc:	Greg KH <greg@...ah.com>, Greg KH <gregkh@...e.de>,
	"Theodore Ts'o" <tytso@....edu>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Justin Forbes <jmforbes@...uxtx.org>,
	linux-kernel@...r.kernel.org,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Domenico Andreoli <cavokz@...il.com>,
	akpm@...ux-foundation.org, Randy Dunlap <rdunlap@...otime.net>,
	Willy Tarreau <w@....eu>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	alan@...rguk.ukuu.org.uk, Chuck Ebbert <cebbert@...hat.com>,
	Dave Jones <davej@...hat.com>, Jake Edge <jake@....net>,
	Michael Krufky <mkrufky@...uxtv.org>, stable@...nel.org,
	Rodrigo Rubira Branco <rbranco@...checkpoint.com>,
	Pierre Ossman <drzeus@...eus.cx>
Subject: Re: [stable] [patch 44/47] pxamci: fix byte aligned DMA transfers



On Thu, 24 Jul 2008, pHilipp Zabel wrote:
> > On Wed, Jul 23, 2008 at 01:24:12PM -0700, Linus Torvalds wrote:
> >>
> >> Hmm. I think it's commit 4fe16897c59882420d66f2d503106653d026ed6c
> >> upstream. I don't know why it has a different SHA1 in the mmc tree, but I
> >> assume that it's because the MMC tree has rebased at some point. Ugh.
> 
> Thank you, I think when I wrote my mail it wasn't pulled yet.

Pulling doesn't change the SHA1 ID of a commit, so _if_ it had been stable 
in the -mmc tree, it would have had the same commit in the kernel too. 
That's very much a design issue in git: the same commit always has the 
same ID. _ALWAYS_.

So the fact that the ID changed implies that something odd happened in the 
-mmc tree. Most likely a rebase. And again, this implies that somebody 
rebased already-public commits, since otherwise nobody would have ever 
even seen the original SHA1 ID. 

Which is not good behaviour, _exactly_ because it makes it much harder for 
people to work together - suddenly a commit that got reported (for 
whatever reason: bug-report or 'please backport', it's all the same issue 
in the end) no longer exists.

		Linus
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