Re: [PATCH 2/3] x86: Implement prctl PR_GET_TSC and PR_SET_TSC

[Ingo Molnar <mingo@elte.hu>]

* Andrew Morton <akpm@linux-foundation.org> wrote:

> > --- a/arch/x86/kernel/process_32.c
> > +++ b/arch/x86/kernel/process_32.c
> > @@ -36,6 +36,7 @@
> >  #include <linux/personality.h>
> >  #include <linux/tick.h>
> >  #include <linux/percpu.h>
> > +#include <linux/prctl.h>
> > 
> >  #include <asm/uaccess.h>
> >  #include <asm/pgtable.h>
> > @@ -528,11 +529,12 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
> >  }
> >  EXPORT_SYMBOL_GPL(start_thread);
> > 
> > -#ifdef CONFIG_SECCOMP
> > +#ifdef CONFIG_DISABLE_TSC
> >  static void hard_disable_TSC(void)
> >  {
> >  	write_cr4(read_cr4() | X86_CR4_TSD);
> >  }
> 
> Won't this break this build if CONFIG_DISABLE_TSC=n and 
> CONFIG_SECCOMP=y?

it would break - but there was an update patch to this 2/3 patch which 
was the one i picked up into x86.git yesterday and which worked fine in 
500 overnight randconfig build and bootup tests.

	Ingo