On Wed, 18 Jul 2018 15:51:39 +0100 alangordonde...@gmail.com wrote: > From: Alan Dewar <alan.de...@att.com> > > Add new APIs to retrieve counters in 64-bit wide fields. > > Signed-off-by: Alan Dewar <alan.de...@att.com>
Do you want to consider 64 bit counter roll over on 32 bit platform? The problem is that incrementing an 64 bit value is not atomic on 32 bit cpu. The carry operation can race with reading. The kernel has special case code to do restartable sequence for accessing 64 bit counter on 32 bit CPU. These functions become nop's on 64bit.
