mm/huge_memory.c: update tlb entry if pmd is changed

When set_pmd_at is called in function do_huge_pmd_anonymous_page, new tlb
entry can be added by software on MIPS platform.

Here add update_mmu_cache_pmd when pmd entry is set, and
update_mmu_cache_pmd is defined as empty excepts arc/mips platform.  This
patch has no negative effect on other platforms except arc/mips system.

Link: http://lkml.kernel.org/r/1592990792-1923-2-git-send-email-maobibo@loongson.cn
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Daniel Silsby <dansilsby@gmail.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index db1585ee25dbfc2017ee62f9219c9e68fe5a0096..a7f47e39935c9c21ace5ccb76743ba53076c187f 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -636,6 +636,7 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
                lru_cache_add_inactive_or_unevictable(page, vma);
                pgtable_trans_huge_deposit(vma->vm_mm, vmf->pmd, pgtable);
                set_pmd_at(vma->vm_mm, haddr, vmf->pmd, entry);
+               update_mmu_cache_pmd(vma, vmf->address, vmf->pmd);
                add_mm_counter(vma->vm_mm, MM_ANONPAGES, HPAGE_PMD_NR);
                mm_inc_nr_ptes(vma->vm_mm);
                spin_unlock(vmf->ptl);
@@ -749,6 +750,7 @@ vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf)
                        } else {
                                set_huge_zero_page(pgtable, vma->vm_mm, vma,
                                                   haddr, vmf->pmd, zero_page);
+                               update_mmu_cache_pmd(vma, vmf->address, vmf->pmd);
                                spin_unlock(vmf->ptl);
                        }
                } else {