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authorAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>2020-05-05 12:47:11 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2020-05-05 21:20:14 +1000
commit7900757ce1b4affda1591aa3fd073e27d202f406 (patch)
treee204cd38b160313c5792109a299ebeec462a08a0 /arch/powerpc/mm
parentec4abf1e70cf6a3fe6e571d640260005c997c6e1 (diff)
powerpc/hash64: Restrict page table lookup using init_mm with __flush_hash_table_range
This is only used with init_mm currently. Walking init_mm is much simpler because we don't need to handle concurrent page table like other mm_context Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200505071729.54912-5-aneesh.kumar@linux.ibm.com
Diffstat (limited to 'arch/powerpc/mm')
-rw-r--r--arch/powerpc/mm/book3s64/hash_tlb.c16
1 files changed, 3 insertions, 13 deletions
diff --git a/arch/powerpc/mm/book3s64/hash_tlb.c b/arch/powerpc/mm/book3s64/hash_tlb.c
index 4a70d8dd39cd..1fa2173413b5 100644
--- a/arch/powerpc/mm/book3s64/hash_tlb.c
+++ b/arch/powerpc/mm/book3s64/hash_tlb.c
@@ -176,7 +176,6 @@ void hash__tlb_flush(struct mmu_gather *tlb)
* from the hash table (and the TLB). But keeps
* the linux PTEs intact.
*
- * @mm : mm_struct of the target address space (generally init_mm)
* @start : starting address
* @end : ending address (not included in the flush)
*
@@ -189,17 +188,14 @@ void hash__tlb_flush(struct mmu_gather *tlb)
* Because of that usage pattern, it is implemented for small size rather
* than speed.
*/
-void __flush_hash_table_range(struct mm_struct *mm, unsigned long start,
- unsigned long end)
+void __flush_hash_table_range(unsigned long start, unsigned long end)
{
- bool is_thp;
int hugepage_shift;
unsigned long flags;
start = _ALIGN_DOWN(start, PAGE_SIZE);
end = _ALIGN_UP(end, PAGE_SIZE);
- BUG_ON(!mm->pgd);
/*
* Note: Normally, we should only ever use a batch within a
@@ -212,21 +208,15 @@ void __flush_hash_table_range(struct mm_struct *mm, unsigned long start,
local_irq_save(flags);
arch_enter_lazy_mmu_mode();
for (; start < end; start += PAGE_SIZE) {
- pte_t *ptep = find_current_mm_pte(mm->pgd, start, &is_thp,
- &hugepage_shift);
+ pte_t *ptep = find_init_mm_pte(start, &hugepage_shift);
unsigned long pte;
if (ptep == NULL)
continue;
pte = pte_val(*ptep);
- if (is_thp)
- trace_hugepage_invalidate(start, pte);
if (!(pte & H_PAGE_HASHPTE))
continue;
- if (unlikely(is_thp))
- hpte_do_hugepage_flush(mm, start, (pmd_t *)ptep, pte);
- else
- hpte_need_flush(mm, start, ptep, pte, hugepage_shift);
+ hpte_need_flush(&init_mm, start, ptep, pte, hugepage_shift);
}
arch_leave_lazy_mmu_mode();
local_irq_restore(flags);