On Thu, Nov 01, 2012 at 07:42:43PM -0200, Marcelo Tosatti wrote:
> On Thu, Nov 01, 2012 at 06:41:46PM +0400, Glauber Costa wrote:
> > On 11/01/2012 02:47 AM, Marcelo Tosatti wrote:
> > > +#ifdef CONFIG_PARAVIRT_CLOCK
> > > +
> > > +static notrace const struct pvclock_vsyscall_time_info *get_pvti(int cpu)
> > > +{
> > > + const aligned_pvti_t *pvti_base;
> > > + int idx = cpu / (PAGE_SIZE/PVTI_SIZE);
> > > + int offset = cpu % (PAGE_SIZE/PVTI_SIZE);
> > > +
> > > + BUG_ON(PVCLOCK_FIXMAP_BEGIN + idx > PVCLOCK_FIXMAP_END);
> > > +
> > > + pvti_base = (aligned_pvti_t *)__fix_to_virt(PVCLOCK_FIXMAP_BEGIN+idx);
> > > +
> > > + return &pvti_base[offset].info;
> > > +}
> > > +
> > Does BUG_ON() really do what you believe it does while in userspace
> > context? We're not running with the kernel descriptors, so this will
> > probably just kill the process without any explanation
>
> A coredump is generated which can be used to trace back to ud2a instruction
> at the vdso code.
All comments have been addressed. Let me know if there is anything else
on v3 that you'd like to see done differently.
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