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tile: add virt_to_kpte() API and clean up and document behavior

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We use virt_to_pte(NULL, va) a lot, which isn't very obvious.
I added virt_to_kpte(va) as a more obvious wrapper function,
that also validates the va as being a kernel adddress.

And, I fixed the semantics of virt_to_pte() so that we handle
the pud and pmd the same way, and we now document the fact that
we handle the final pte level differently.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf
2013-08-12 15:08:09 -04:00
parent 49cf78ef7b
commit 640710a33b
6 changed files with 30 additions and 11 deletions
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6
arch/tile/kernel/setup.c
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@@ -1600,7 +1600,7 @@ void __init setup_per_cpu_areas(void)
/* Update the vmalloc mapping and page home. */
unsigned long addr = (unsigned long)ptr + i;
pte_t *ptep = virt_to_pte(NULL, addr);
pte_t *ptep = virt_to_kpte(addr);
pte_t pte = *ptep;
BUG_ON(pfn != pte_pfn(pte));
pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_TILE_L3);
@@ -1609,12 +1609,12 @@ void __init setup_per_cpu_areas(void)
/* Update the lowmem mapping for consistency. */
lowmem_va = (unsigned long)pfn_to_kaddr(pfn);
ptep = virt_to_pte(NULL, lowmem_va);
ptep = virt_to_kpte(lowmem_va);
if (pte_huge(*ptep)) {
printk(KERN_DEBUG "early shatter of huge page"
" at %#lx\n", lowmem_va);
shatter_pmd((pmd_t *)ptep);
ptep = virt_to_pte(NULL, lowmem_va);
ptep = virt_to_kpte(lowmem_va);
BUG_ON(pte_huge(*ptep));
}
BUG_ON(pfn != pte_pfn(*ptep));