linux

iv/linux

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Vaidyanathan Srinivasan 363edbe261 powerpc: Default arch idle could cede processor on pseries

When adding cpuidle support to pSeries, we introduced two
regressions:

  - The new cpuidle backend driver only works under hypervisors
    supporting the "SLPLAR" option, which isn't the case of the
    old POWER4 hypervisor and the HV "light" used on js2x blades

  - The cpuidle driver registers fairly late, meaning that for
    a significant portion of the boot process, we end up having
    all threads spinning. This slows down the boot process and
    increases the overall resource usage if the hypervisor has
    shared processors.

This fixes both by implementing a "default" idle that will cede
to the hypervisor when possible, in a very simple way without
all the bells and whisles of cpuidle.

Reported-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Acked-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: <stable@vger.kernel.org>

2013-09-11 11:41:54 +10:00

8xx

powerpc/8xx: Erroneous double irq_eoi() on CPM IRQ in MPC8xx

2013-07-01 18:38:32 -05:00

40x

Removal of GENERIC_GPIO for v3.10

2013-05-09 09:59:16 -07:00

44x

i2c: move OF helpers into the core

2013-08-23 10:22:20 +02:00

52xx

powerpc: 52xx: provide a default in mpc52xx_irqhost_map()