> Hi
> I get this:
>   gcc -Wp,-MD,arch/i386/kernel/timers/.timer.o.d -D__KERNEL__ -Iinclude -Wall 
> -Wstrict-prototypes -Wno-trigraphs -O2 -fomit-frame-pointer 
> -fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2 
> -march=i686 -Iarch/i386/mach-generic -nostdinc -iwithprefix include    
> -DKBUILD_BASENAME=timer   -c -o arch/i386/kernel/timers/timer.o 
> arch/i386/kernel/timers/timer.c
>   gcc -Wp,-MD,arch/i386/kernel/timers/.timer_tsc.o.d -D__KERNEL__ -Iinclude 
> -Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fomit-frame-pointer 
> -fno-strict-aliasing -fno-common -pipe -mpreferred-stack-boundary=2 
> -march=i686 -Iarch/i386/mach-generic -nostdinc -iwithprefix include    
> -DKBUILD_BASENAME=timer_tsc   -c -o arch/i386/kernel/timers/timer_tsc.o 
> arch/i386/kernel/timers/timer_tsc.c
> arch/i386/kernel/timers/timer_tsc.c: In function `time_cpufreq_notifier':
> arch/i386/kernel/timers/timer_tsc.c:181: `CPUFREQ_PRECHANGE' undeclared (first 
> use in this function)

[snip]

Attached patch (which simply includes<linux/cpufreq.h>) makes it compile. Don't know
 whether it's the Right Fix (TM), so...

--alessandro