MySQL Bugs: #75835: O_DIRECT cannot be used on tmpfs

Bug #75835	O_DIRECT cannot be used on tmpfs - can this be changed?
Submitted:	10 Feb 2015 7:53
Reporter:	Roel Van de Paar (OCA)	Email Updates:
Status:	Open	Impact on me:	None
Category:	MySQL Server	Severity:	S4 (Feature request)
Version:	5.6,5.7	OS:	Any
Assigned to:		CPU Architecture:	Any

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Description:
2015-02-10T06:48:50.409394Z 0 [Warning] InnoDB: Failed to set O_DIRECT on file ./ibdata1: OPEN: Invalid argument, continuing anyway. O_DIRECT is known to result  in 'Invalid argument' on Linux on tmpfs, see MySQL Bug#26662.

http://bugs.mysql.com/bug.php?id=26662
http://bugs.mysql.com/bug.php?id=58421

How to repeat:
Try and use O_DIRECT on tmpfs

Suggested fix:
This restriction is old. Is it still necessary? Can O_DIRECT now be allowed on tmpfs? It would help with QA.