On Tue, 8 May 2007, Nick Piggin wrote:

> This patch trades a page flag for a significant improvement in the unlock_page
> fastpath. Various problems in the previous version were spotted by Hugh and
> Ben (and fixed in this one).
> 
> Comments?

Seems there's still a bug there.  I get hangs on the page lock, on
i386 and on x86_64 and on powerpc: sometimes they unhang themselves
after a while (presume other activity does the wakeup).  Obvious even
while booting (Starting udevd).  Sorry, not had time to investigate.

Hugh
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