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| author | Stafford Horne <[email protected]> | 2017-06-23 22:09:59 +0000 |
|---|---|---|
| committer | Stafford Horne <[email protected]> | 2017-11-03 05:01:14 +0000 |
| commit | c056718464512da06d7f65a27d5e4f1707b24c80 (patch) | |
| tree | 3b3b3076d876428ae8b81826f7171f22e84009a5 /fs/proc/array.c | |
| parent | openrisc: fix initial preempt state for secondary cpu tasks (diff) | |
| download | kernel-c056718464512da06d7f65a27d5e4f1707b24c80.tar.gz kernel-c056718464512da06d7f65a27d5e4f1707b24c80.zip | |
openrisc: sleep instead of spin on secondary wait
Currently we do a spin on secondary cpus when waiting to boot. This
theoretically causes issues with power consumption and does cause issues
with qemu cycle burning (it starves cpu 0 from actually being able to
boot.)
This change puts each secondary cpu to sleep if they have a power
management unit, then signals them to wake via IPI when its time to boot.
If the cpus have no power management unit they will loop as before.
Note: The wakeup IPI requires a special interrupt handler as on secondary
cpu's the interrupt infrastructure is not yet established. This
interrupt handler is set and reset by updating SPR_EVBAR.
Signed-off-by: Stafford Horne <[email protected]>
Diffstat (limited to 'fs/proc/array.c')
0 files changed, 0 insertions, 0 deletions