Re: [PATCH] context_tracking: Restore previous state in schedule_user

[Dave Jones]

On Wed, Dec 03, 2014 at 03:18:41PM -0800, Andy Lutomirski wrote:
 > It appears that some SCHEDULE_USER (asm for schedule_user) callers
 > in arch/x86/kernel/entry_64.S are called from RCU kernel context,
 > and schedule_user will return in RCU user context.  This causes RCU
 > warnings and possible failures.
 > 
 > This is intended to be a minimal fix suitable for 3.18.
 > 
 > Reported-by: Dave Jones <davej@xxxxxxxxxx>
 > Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
 > Cc: Frédéric Weisbecker <fweisbec@xxxxxxxxx>
 > Cc: Paul McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
 > Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
 > ---
 > 
 > Hi all-
 > 
 > This is intended to be a suitable last-minute fix for the RCU issue that
 > Dave saw.
 > 
 > Dave, can you confirm that this fixes it?

ACK, feel free to add my Tested-by:

	Dave
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