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| author |   David Vrabel <david.vrabel@citrix.com> | 2013-08-15 13:21:06 +0100 |
|---|---|---|
| committer |   Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2013-08-20 10:13:02 -0400 |
| commit | 84ca7a8e45dafb49cd5ca90a343ba033e2885c17 (patch) | |
| tree | 78e6c4f1baed53a9e431125e486cd036a4490a91 /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | x86/xen: do not identity map UNUSABLE regions in the machine E820 (diff) | |
| download | linux-dev-84ca7a8e45dafb49cd5ca90a343ba033e2885c17.tar.xz linux-dev-84ca7a8e45dafb49cd5ca90a343ba033e2885c17.zip | |
xen/events: initialize local per-cpu mask for all possible events
The sizeof() argument in init_evtchn_cpu_bindings() is incorrect
resulting in only the first 64 (or 32 in 32-bit guests) ports having
their bindings being initialized to VCPU 0.
In most cases this does not cause a problem as request_irq() will set
the irq affinity which will set the correct local per-cpu mask.
However, if the request_irq() is called on a VCPU other than 0, there
is a window between the unmasking of the event and the affinity being
set were an event may be lost because it is not locally unmasked on
any VCPU. If request_irq() is called on VCPU 0 then local irqs are
disabled during the window and the race does not occur.
Fix this by initializing all NR_EVENT_CHANNEL bits in the local
per-cpu masks.
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: stable@vger.kernel.org
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions