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  1. Jun 21, 2013
  3. Jun 20, 2013
  5. Jun 19, 2013
  7. Jun 18, 2013
    • David Daney's avatar
      [IA64] Fix include dependency in asm/irqflags.h · f7577310
      David Daney authored 
      asm/kregs.h isn't always included first, so we need an explicit include.

[Fix build breakage introduced by f21afc25


 smp.h: Use local_irq_{save,restore}() in !SMP version of on_each_cpu().]

Signed-off-by: default avatarDavid Daney <david.daney@cavium.com>
Acked-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
      f7577310
    • Stephen Warren's avatar
      ARM: 7759/1: decouple CPU offlining from reboot/shutdown · 19ab428f
      Stephen Warren authored 
      

Add comments to machine_shutdown()/halt()/power_off()/restart() that
describe their purpose and/or requirements re: CPUs being active/not.

In machine_shutdown(), replace the call to smp_send_stop() with a call to
disable_nonboot_cpus(). This completely disables all but one CPU, thus
satisfying the requirement that only a single CPU be active for kexec.
Adjust Kconfig dependencies for this change.

In machine_halt()/power_off()/restart(), call smp_send_stop() directly,
rather than via machine_shutdown(); these functions don't need to
completely de-activate all CPUs using hotplug, but rather just quiesce
them.

Remove smp_kill_cpus(), and its call from smp_send_stop().
smp_kill_cpus() was indirectly calling smp_ops.cpu_kill() without calling
smp_ops.cpu_die() on the target CPUs first. At least some implementations
of smp_ops had issues with this; it caused cpu_kill() to hang on Tegra,
for example. Since smp_send_stop() is only used for shutdown, halt, and
power-off, there is no need to attempt any kind of CPU hotplug here.

Adjust Kconfig to reflect that machine_shutdown() (and hence kexec)
relies upon disable_nonboot_cpus(). However, this alone doesn't guarantee
that hotplug will work, or even that hotplug is implemented for a
particular piece of HW that a multi-platform zImage runs on. Hence, add
error-checking to machine_kexec() to determine whether it did work.

Suggested-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
Acked-by: default avatarWill Deacon <will.deacon@arm.com>
Tested-by: default avatarZhangfei Gao <zhangfei.gao@gmail.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      19ab428f
  9. Jun 17, 2013