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authorLinus Torvalds <torvalds@macmini.osdl.org>2006-07-23 12:12:16 -0700
committerLinus Torvalds <torvalds@macmini.osdl.org>2006-07-23 12:12:16 -0700
commitaa95387774039096c11803c04011f1aa42d85758 (patch)
treeb8d3c845efedc2d67bcaff0038b4306fa375379c /include/linux/kdev_t.h
parent2cd7cbdf4bd0d0fe58e4dc903e8b413412595504 (diff)
cpu hotplug: simplify and hopefully fix locking
The CPU hotplug locking was quite messy, with a recursive lock to handle the fact that both the actual up/down sequence wanted to protect itself from being re-entered, but the callbacks that it called also tended to want to protect themselves from CPU events. This splits the lock into two (one to serialize the whole hotplug sequence, the other to protect against the CPU present bitmaps changing). The latter still allows recursive usage because some subsystems (ondemand policy for cpufreq at least) had already gotten too used to the lax locking, but the locking mistakes are hopefully now less fundamental, and we now warn about recursive lock usage when we see it, in the hope that it can be fixed. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/kdev_t.h')
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