panic on bootup due to __GFP_ZERO patch

[Chris Wright]

I'm getting a panic during pidmap_init with a backtrace that looks
something like:

buffered_rmqueue
__alloc_pages
get_zeroed_page
pidmap_init
start_kernel

Reverting the __GFP_ZERO patch fixes the issue, haven't drilled down
any deeper yet to see what in the patch is causing the problem.  This is
x86 w/out HIGHMEM (and no NUMA).

Any ideas?

thanks,
-chris
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