Re: [Xen-users] Attempt to apply xen-patches-2.6.34-4.tar.bz2 to 2.6.34.7 vanilla

[listmail <listmail@xxxxxxxxxxxx>]

On 10/10/2010 1:37 PM, listmail wrote:

On 10/10/2010 12:59 PM, Boris Derzhavets wrote:

> Does it compile as is with CONFIG_HOTPLUG_CPU=n ?

Not exactly.  To set  CONFIG_HOTPLUG_CPU=n  I had to do 
( not sure steps are really required ) :-

1) kernel/power/Kconfig.
Step 1
config PM_SLEEP_SMP
        bool
        depends on SMP
        depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
        depends on PM_SLEEP
#       select HOTPLUG_CPU
        default y

2) arch/x86/Kconfig
Step 2
config HOTPLUG_CPU
#       bool "Support for hot-pluggable CPUs"
        def_bool n
#       depends on SMP && HOTPLUG
        ---help---
          Say Y here to allow turning CPUs off and on. CPUs can be
          controlled through /sys/devices/system/cpu.
          ( Note: power management support will enable this option
            automatically on SMP systems. )
          Say N if you want to disable CPU hotplug.

those functions (undefined references) are defined here http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.34.y.git;a=blob_plain;f=arch/x86/kernel/smpboot.c;hb=f42346985c7721798c577606cb4d0f719940d33e

I wonder if this file is not getting used because of some other setting is not set or perhaps its because arch is xen and there are no such file smpboot.c in arch / x86 / xen ?

Err, or perhaps that the xen patches provide xen/core/smpboot.c but they do not have those particular defines.  I don't have access to a patched tree right now otherwise I'd probably diff the 2.6.34.4, pvops and Xenified versions to see if some missing code could be pasted in.  Might not be worth the effort though.

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