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2 delays - Information on the various kernel delay / sleep mechanisms
8 This question is most often faced by driver writers who have to
9 deal with hardware delays and who may not be the most intimately
14 ----------------
16 The first, and most important, question you need to ask is "Is my
30 	udelay is the generally preferred API; ndelay-level
31 	precision may not actually exist on many non-PC devices.
38 NON-ATOMIC CONTEXT:
45 	-- Backed by busy-wait loop:
49 	-- Backed by hrtimers:
53 	-- Backed by jiffies / legacy_timers
66 		- Why not usleep?
67 			On slower systems, (embedded, OR perhaps a speed-
73 	SLEEPING FOR ~USECS OR SMALL MSECS ( 10us - 20ms):
76 		- Why not msleep for (1ms - 20ms)?
85 		- Why is there no "usleep" / What is a good range?
101 			is left to the caller to determine a reasonable range.
106 		- What's the difference?