[PATCH v3 0/2] Leave IRQs enabled for per-cpu page allocations

[Mel Gorman]

Changelog since V2
o Fix list corruption issue					(hughd)
o Tighen up locking protocol					(hughd)
o Micro-optimisations						(hughd)

Changelog since V1
o Use trylock in free_unref_page_list due to IO completion from
  softirq context						(yuzhao)

This was a standalone patch but now split in two. The main changes since
v2 are fixing the issues exposed by Hugh's shmfs stress test.

Patch 1 is a long-standing issue that is technically a bug but happened
to work because of how it was used.

Patch 2 leaves IRQs enabled for most PCP allocations with more details
in the changelog itself.

-- 
2.35.3