[PATCH] RISC-V: Check clint_time_val before use

[Damien Le Moal]

On Sat, 2020-09-26 at 11:09 +0100, Maciej W. Rozycki wrote:
> On Sat, 26 Sep 2020, Damien Le Moal wrote:
> 
> > > > Applying this on top of rc6, I now get a hang on Kendryte boot...
> > > > No problems without the patch on the other hand.
> > > 
> > > Not sure about the issue with Kendryte but I get a crash on
> > > QEMU virt machine without this patch.
> > 
> > With this applied in addition to your patch, it works.
> > 
> > diff --git a/drivers/clocksource/timer-clint.c b/drivers/clocksource/timer-
> > clint.c
> > index d17367dee02c..8dbec85979fd 100644
> > --- a/drivers/clocksource/timer-clint.c
> > +++ b/drivers/clocksource/timer-clint.c
> > @@ -37,7 +37,7 @@ static unsigned long clint_timer_freq;
> >  static unsigned int clint_timer_irq;
> >  
> >  #ifdef CONFIG_RISCV_M_MODE
> > -u64 __iomem *clint_time_val;
> > +u64 __iomem *clint_time_val = NULL;
> >  #endif
> 
>  Hmm, BSS initialisation issue?

Not a static variable, so it is not in BSS, no ?

> 
>   Maciej

-- 
Damien Le Moal
Western Digital