linux-kernel - sync_set_bit() vs set_bit() -- what's the difference?

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Message-ID: <EE124450C0AAF944A40DD71E61F878C99639F3@SINEX14MBXC419.southpacific.corp.microsoft.com>
Date:	Wed, 27 Aug 2014 07:30:09 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	KY Srinivasan <kys@...rosoft.com>,
	"chrisw@...s-sol.org" <chrisw@...s-sol.org>,
	"jeremy@...p.org" <jeremy@...p.org>,
	Jan Beulich <JBeulich@...e.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: sync_set_bit() vs set_bit()  -- what's the difference?

I'm curious about the difference. :-)

sync_set_bit() is only used in drivers/hv/ and drivers/xen/ while set_bit() is used in all other places. What makes hv/xen special?

Thanks,
-- Dexuan

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