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authorRobert Richter <robert.richter@amd.com>2010-04-29 14:55:55 +0200
committerRobert Richter <robert.richter@amd.com>2010-05-04 11:37:56 +0200
commit6ae56b55bc364bc2f2342f599b46581627ba22da (patch)
tree0457732ebc2827aeb976881345e620c656fbb338 /drivers/ide/sl82c105.c
parentoprofile/x86: remove CONFIG_SMP macros (diff)
downloadlinux-6ae56b55bc364bc2f2342f599b46581627ba22da.tar.xz
linux-6ae56b55bc364bc2f2342f599b46581627ba22da.zip
oprofile/x86: protect cpu hotplug sections
This patch reworks oprofile cpu hotplug code as follows: Introduce ctr_running variable to check, if counters are running or not. The state must be known for taking a cpu on or offline and when switching counters during counter multiplexing. Protect on_each_cpu() sections with get_online_cpus()/put_online_cpu() functions. This is necessary if notifiers or states are modified. Within these sections the cpu mask may not change. Switch only between counters in nmi_cpu_switch(), if counters are running. Otherwise the switch may restart a counter though they are disabled. Add nmi_cpu_setup() and nmi_cpu_shutdown() to cpu hotplug code. The function must also be called to avoid uninitialzed counter usage. Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Robert Richter <robert.richter@amd.com>
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