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| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2020-05-05 12:47:11 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-05 21:20:14 +1000 |
| commit | 7900757ce1b4affda1591aa3fd073e27d202f406 (patch) | |
| tree | e204cd38b160313c5792109a299ebeec462a08a0 /arch/powerpc/mm/book3s64/hash_tlb.c | |
| parent | ec4abf1e70cf6a3fe6e571d640260005c997c6e1 (diff) | |
| download | linux-7900757ce1b4affda1591aa3fd073e27d202f406.tar.bz2 | |
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/book3s64/hash_tlb.c')
| -rw-r--r-- | arch/powerpc/mm/book3s64/hash_tlb.c | 16 |
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); |