Re: [PATCH 2/2] mm,migration: Fix race between shift_arg_pages and rmap_walk by guaranteeing rmap_walk finds PTEs created within the temporary stack

[Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>]

On Fri, 7 May 2010, KAMEZAWA Hiroyuki wrote:
> 
> IIUC, move_page_tables() may call "page table allocation" and it cannot be
> done under spinlock.

Bah. It only does a "alloc_new_pmd()", and we could easily move that out 
of the loop and pre-allocate the pmd's.

If that's the only reason, then it's a really weak one, methinks.

			Linus

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