On Tue, Jul 14, 2020 at 12:10:47PM -0700, Ira Weiny wrote:
> On Tue, Jul 14, 2020 at 10:40:57AM +0200, Peter Zijlstra wrote:
> > That's an anti-pattern vs static_keys, I'm thinking you actually want
> > static_key_slow_{inc,dec}() instead of {enable,disable}().
>
> Thanks. I'll go read the doc f
On Tue, Jul 14, 2020 at 10:40:57AM +0200, Peter Zijlstra wrote:
> On Tue, Jul 14, 2020 at 12:02:16AM -0700, ira.we...@intel.com wrote:
>
> > +static pgprot_t dev_protection_enable_get(struct dev_pagemap *pgmap,
> > pgprot_t prot)
> > +{
> > + if (pgmap->flags & PGMAP_PROT_ENABLED && dev_page_pk
On Tue, Jul 14, 2020 at 12:02:16AM -0700, ira.we...@intel.com wrote:
> +static pgprot_t dev_protection_enable_get(struct dev_pagemap *pgmap,
> pgprot_t prot)
> +{
> + if (pgmap->flags & PGMAP_PROT_ENABLED && dev_page_pkey != PKEY_INVALID)
> {
> + pgprotval_t val = pgprot_val(prot
From: Ira Weiny
Device managed memory exposes itself to the kernel direct map which
allows stray pointers to access these device memories.
Stray pointers to normal memory may result in a crash or other
undesirable behavior which, while unfortunate, are usually recoverable
with a reboot. Stray w
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