On Thu, 2018-03-08 at 14:07 -0800, Matthew Wilcox wrote:
> On Thu, Mar 08, 2018 at 03:56:30PM +, Kani, Toshi wrote:
> > On Wed, 2018-03-07 at 20:00 -0800, Matthew Wilcox wrote:
> > > On Wed, Mar 07, 2018 at 11:32:26AM -0700, Toshi Kani wrote:
> > > > +/**
> > > > + * pud_free_pmd_page - clear p
On Thu, Mar 08, 2018 at 03:56:30PM +, Kani, Toshi wrote:
> On Wed, 2018-03-07 at 20:00 -0800, Matthew Wilcox wrote:
> > On Wed, Mar 07, 2018 at 11:32:26AM -0700, Toshi Kani wrote:
> > > +/**
> > > + * pud_free_pmd_page - clear pud entry and free pmd page
> > > + *
> > > + * Returns 1 on success
On Thu, 2018-03-08 at 18:04 +, Will Deacon wrote:
:
> > diff --git a/lib/ioremap.c b/lib/ioremap.c
> > index b808a390e4c3..54e5bbaa3200 100644
> > --- a/lib/ioremap.c
> > +++ b/lib/ioremap.c
> > @@ -91,7 +91,8 @@ static inline int ioremap_pmd_range(pud_t *pud, unsigned
> > long addr,
> >
>
Hi Toshi,
Thanks for the patches!
On Wed, Mar 07, 2018 at 11:32:26AM -0700, Toshi Kani wrote:
> On architectures with CONFIG_HAVE_ARCH_HUGE_VMAP set, ioremap()
> may create pud/pmd mappings. Kernel panic was observed on arm64
> systems with Cortex-A75 in the following steps as described by
> Han
On Wed, 2018-03-07 at 20:00 -0800, Matthew Wilcox wrote:
> On Wed, Mar 07, 2018 at 11:32:26AM -0700, Toshi Kani wrote:
> > +/**
> > + * pud_free_pmd_page - clear pud entry and free pmd page
> > + *
> > + * Returns 1 on success and 0 on failure (pud not cleared).
> > + */
> > +int pud_free_pmd_page(
* Toshi Kani wrote:
> On architectures with CONFIG_HAVE_ARCH_HUGE_VMAP set, ioremap()
> may create pud/pmd mappings. Kernel panic was observed on arm64
> systems with Cortex-A75 in the following steps as described by
> Hanjun Guo.
>
> 1. ioremap a 4K size, valid page table will build,
> 2. iou
On Wed, Mar 07, 2018 at 11:32:26AM -0700, Toshi Kani wrote:
> +/**
> + * pud_free_pmd_page - clear pud entry and free pmd page
> + *
> + * Returns 1 on success and 0 on failure (pud not cleared).
> + */
> +int pud_free_pmd_page(pud_t *pud)
> +{
> + return pud_none(*pud);
> +}
Wouldn't it be cl
On Wed, 2018-03-07 at 14:54 -0800, Andrew Morton wrote:
> On Wed, 7 Mar 2018 11:32:26 -0700 Toshi Kani wrote:
>
> > On architectures with CONFIG_HAVE_ARCH_HUGE_VMAP set, ioremap()
> > may create pud/pmd mappings. Kernel panic was observed on arm64
> > systems with Cortex-A75 in the following st
On Wed, 7 Mar 2018 11:32:26 -0700 Toshi Kani wrote:
> On architectures with CONFIG_HAVE_ARCH_HUGE_VMAP set, ioremap()
> may create pud/pmd mappings. Kernel panic was observed on arm64
> systems with Cortex-A75 in the following steps as described by
> Hanjun Guo.
>
> 1. ioremap a 4K size, valid
On Wed, 7 Mar 2018 11:32:26 -0700 Toshi Kani wrote:
> On architectures with CONFIG_HAVE_ARCH_HUGE_VMAP set, ioremap()
> may create pud/pmd mappings. Kernel panic was observed on arm64
> systems with Cortex-A75 in the following steps as described by
> Hanjun Guo.
>
> 1. ioremap a 4K size, valid
On architectures with CONFIG_HAVE_ARCH_HUGE_VMAP set, ioremap()
may create pud/pmd mappings. Kernel panic was observed on arm64
systems with Cortex-A75 in the following steps as described by
Hanjun Guo.
1. ioremap a 4K size, valid page table will build,
2. iounmap it, pte0 will set to 0;
3. iorem
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