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.
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2.35.3