On Wed, 2018-05-30 at 06:59 +0200, j...@8bytes.org wrote:
> On Tue, May 29, 2018 at 04:10:24PM +, Kani, Toshi wrote:
> > Can you explain why you think allocating a page here is a major problem?
>
> Because a larger allocation is more likely to fail. And if you fail the
> allocation, you also
On Wed, 2018-05-30 at 06:59 +0200, j...@8bytes.org wrote:
> On Tue, May 29, 2018 at 04:10:24PM +, Kani, Toshi wrote:
> > Can you explain why you think allocating a page here is a major problem?
>
> Because a larger allocation is more likely to fail. And if you fail the
> allocation, you also
On Tue, May 29, 2018 at 04:10:24PM +, Kani, Toshi wrote:
> Can you explain why you think allocating a page here is a major problem?
Because a larger allocation is more likely to fail. And if you fail the
allocation, you also fail to free more pages, which _is_ a problem. So
better avoid any
On Tue, May 29, 2018 at 04:10:24PM +, Kani, Toshi wrote:
> Can you explain why you think allocating a page here is a major problem?
Because a larger allocation is more likely to fail. And if you fail the
allocation, you also fail to free more pages, which _is_ a problem. So
better avoid any
On Tue, 2018-05-29 at 16:44 +0200, Joerg Roedel wrote:
> On Wed, May 16, 2018 at 05:32:07PM -0600, Toshi Kani wrote:
> > pmd = (pmd_t *)pud_page_vaddr(*pud);
> > + pmd_sv = (pmd_t *)__get_free_page(GFP_KERNEL);
> > + if (!pmd_sv)
> > + return 0;
>
> So your code still needs to
On Tue, 2018-05-29 at 16:44 +0200, Joerg Roedel wrote:
> On Wed, May 16, 2018 at 05:32:07PM -0600, Toshi Kani wrote:
> > pmd = (pmd_t *)pud_page_vaddr(*pud);
> > + pmd_sv = (pmd_t *)__get_free_page(GFP_KERNEL);
> > + if (!pmd_sv)
> > + return 0;
>
> So your code still needs to
On Wed, May 16, 2018 at 05:32:07PM -0600, Toshi Kani wrote:
> pmd = (pmd_t *)pud_page_vaddr(*pud);
> + pmd_sv = (pmd_t *)__get_free_page(GFP_KERNEL);
> + if (!pmd_sv)
> + return 0;
So your code still needs to allocate a full page where a simple
list_head on the stack
On Wed, May 16, 2018 at 05:32:07PM -0600, Toshi Kani wrote:
> pmd = (pmd_t *)pud_page_vaddr(*pud);
> + pmd_sv = (pmd_t *)__get_free_page(GFP_KERNEL);
> + if (!pmd_sv)
> + return 0;
So your code still needs to allocate a full page where a simple
list_head on the stack
ioremap() calls pud_free_pmd_page() / pmd_free_pte_page() when it creates
a pud / pmd map. The following preconditions are met at their entry.
- All pte entries for a target pud/pmd address range have been cleared.
- System-wide TLB purges have been peformed for a target pud/pmd address
ioremap() calls pud_free_pmd_page() / pmd_free_pte_page() when it creates
a pud / pmd map. The following preconditions are met at their entry.
- All pte entries for a target pud/pmd address range have been cleared.
- System-wide TLB purges have been peformed for a target pud/pmd address
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