Re: [3/3] 2.6.23-rc2: known regressions v2

[Sam Ravnborg <sam@ravnborg.org>]

On Mon, Aug 13, 2007 at 03:21:54PM +0200, Michal Piotrowski wrote:
> > >
> > > The patch changes the warning to a different warning, it's now
> > > kernel/power/Kconfig:79:warning: 'select' used by config symbol 'PM_SLEEP_SMP' refers to undefined symbol 'HOTPLUG_CPU'

So we have something like this for ppc:

config PM_SLEEP_SMP
	bool "bla bla"
	select HOTPLUG_CPU

As it is not in my -linus tree it has been added by the referanced patch
in the text I zapped.


The warning is generated _independently_ of the actual configuration.
All it says is that the symbol PM_SLEEP_SMP has a seelct statement
for an unknown symbol - unknown for this architecture at least.

Grepping will reveal that HOTPLUG_CPU is not present for ppc and
the easiet fix here seems to just add it like in the following:

diff --git a/arch/ppc/Kconfig b/arch/ppc/Kconfig
index 6bdeeb7..e7bcd57 100644
--- a/arch/ppc/Kconfig
+++ b/arch/ppc/Kconfig
@@ -65,6 +65,10 @@ config GENERIC_BUG
        default y
        depends on BUG
 
+config HOTPLUG_CPU
+       bool
+       default n
+
 source "init/Kconfig"
 
 menu "Processor"

[cut'n'paste so whitespace damaged...]
This will silence the warning...


Now as PM_SLEEP_SMP requires HOTPLUG_CPU there most be done
something else to prevent this config symbol to be selected
otherwise we would end up with a kernel that has HOTPLUG_CPU
defined even it is not supported.


	Sam