Re: [PATCH v2 2/2] misc: dice: Add driver to forward secrets to userspace

[Greg Kroah-Hartman]

On Thu, Dec 09, 2021 at 08:38:57PM +0100, Pavel Machek wrote:
> Hi!
> 
> > > +	memzero_explicit(kaddr, dice_rmem->size);
> > > +	devm_memunmap(dice_misc.this_device, kaddr);
> > 
> > Do you really need to call memzero_explicit()?  This isn't "local"
> > memory, if the compiler "optimizes away" a normal call, it would be
> > _VERY_ broken.
> 
> For clearing secrets, I believe memzero_explicit is nice
> documentation.

Only if it's really needed please.