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author | Robert Richter <robert.richter@amd.com> | 2010-04-29 14:55:55 +0200 |
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committer | Robert Richter <robert.richter@amd.com> | 2010-05-04 11:37:56 +0200 |
commit | 6ae56b55bc364bc2f2342f599b46581627ba22da (patch) | |
tree | 0457732ebc2827aeb976881345e620c656fbb338 /drivers/ide/sl82c105.c | |
parent | oprofile/x86: remove CONFIG_SMP macros (diff) | |
download | linux-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>
Diffstat (limited to 'drivers/ide/sl82c105.c')
0 files changed, 0 insertions, 0 deletions