GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-23 07:12:09 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

powerpc/book3s: Use config independent helpers for page table walk

Browse source 
Even when we have HugeTLB and THP disabled, kernel linear map can still be
mapped with hugepages. This is only an issue with radix translation because hash
MMU doesn't map kernel linear range in linux page table and other kernel
map areas are not mapped using hugepage.

Add config independent helpers and put WARN_ON() when we don't expect things
to be mapped via hugepages.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2019-05-14 11:33:00 +05:30 • committed by Michael Ellerman
parent 259a948c4b
commit d6eacedd1f
9 changed files with 102 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

16
arch/powerpc/mm/pgtable.c
View file

@ -340,10 +340,11 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
if (pgd_none(pgd))
return NULL;
if (pgd_huge(pgd)) {
if (pgd_is_leaf(pgd)) {
ret_pte = (pte_t *)pgdp;
goto out;
}
if (is_hugepd(__hugepd(pgd_val(pgd)))) {
hpdp = (hugepd_t *)&pgd;
goto out_huge;
@ -361,14 +362,16 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
if (pud_none(pud))
return NULL;
if (pud_huge(pud)) {
if (pud_is_leaf(pud)) {
ret_pte = (pte_t *)pudp;
goto out;
}
if (is_hugepd(__hugepd(pud_val(pud)))) {
hpdp = (hugepd_t *)&pud;
goto out_huge;
}
pdshift = PMD_SHIFT;
pmdp = pmd_offset(&pud, ea);
pmd = READ_ONCE(*pmdp);
@ -397,15 +400,12 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
ret_pte = (pte_t *)pmdp;
goto out;
}
/*
* pmd_large check below will handle the swap pmd pte
* we need to do both the check because they are config
* dependent.
*/
if (pmd_huge(pmd) || pmd_large(pmd)) {
if (pmd_is_leaf(pmd)) {
ret_pte = (pte_t *)pmdp;
goto out;
}
if (is_hugepd(__hugepd(pmd_val(pmd)))) {
hpdp = (hugepd_t *)&pmd;
goto out_huge;