WARNING: drivers/md/dm-thin-pool.o(.text+0x53ce): Section mismatch in reference f

Hi Mike,

FYI, there are new compile warnings show up in

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm.git for-linus
head:   dba141601d1327146c84b575bd581ea8730e901c
commit: 44feb387f6f5584535bd6e3ad7ccfdce715d7dba [6/8] dm thin: prepare to separate bio_prison code
config: x86_64-allyesconfig # make ARCH=x86_64 

All warnings:

WARNING: drivers/md/dm-thin-pool.o(.text+0x53ce): Section mismatch in reference from the function dm_thin_exit() to the function .exit.text:dm_bio_prison_exit() The function dm_thin_exit() references a function in an exit section.
Often the function dm_bio_prison_exit() has valid usage outside the exit section
and the fix is to remove the __exit annotation of dm_bio_prison_exit.

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0-DAY kernel build testing backend Open Source Technology Center
Fengguang Wu, Yuanhan Liu Intel Corporation

Actually it's the other way round - dm_thin_exit() should just have __exit added. Warning disappears with the patch after it and I don't think it's a problem, but we should clean it up next time anyway.

Alasdair