The patch titled
Subject: mm/mremap: move TLB flush outside page table lock
has been removed from the -mm tree. Its filename was
mm-mremap-move-tlb-flush-outside-page-table-lock.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>
Subject: mm/mremap: move TLB flush outside page table lock
Move TLB flush outside page table lock so that kernel does less with page
table lock held. Releasing the ptl with old TLB contents still valid will
behave such that such access happened before the level3 or level2 entry
update.
Link: https://lkml.kernel.org/r/20210422054323.150993-8-aneesh.kumar@xxxxxxxxxxxxx
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>
Cc: Kalesh Singh <kaleshsingh@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mremap.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/mm/mremap.c~mm-mremap-move-tlb-flush-outside-page-table-lock
+++ a/mm/mremap.c
@@ -258,7 +258,7 @@ static bool move_normal_pmd(struct vm_ar
* We don't have to worry about the ordering of src and dst
* ptlocks because exclusive mmap_lock prevents deadlock.
*/
- old_ptl = pmd_lock(vma->vm_mm, old_pmd);
+ old_ptl = pmd_lock(mm, old_pmd);
new_ptl = pmd_lockptr(mm, new_pmd);
if (new_ptl != old_ptl)
spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING);
@@ -270,11 +270,11 @@ static bool move_normal_pmd(struct vm_ar
VM_BUG_ON(!pmd_none(*new_pmd));
pmd_populate(mm, new_pmd, pmd_pgtable(pmd));
- flush_pte_tlb_pwc_range(vma, old_addr, old_addr + PMD_SIZE);
if (new_ptl != old_ptl)
spin_unlock(new_ptl);
spin_unlock(old_ptl);
+ flush_pte_tlb_pwc_range(vma, old_addr, old_addr + PMD_SIZE);
return true;
}
#else
@@ -305,7 +305,7 @@ static bool move_normal_pud(struct vm_ar
* We don't have to worry about the ordering of src and dst
* ptlocks because exclusive mmap_lock prevents deadlock.
*/
- old_ptl = pud_lock(vma->vm_mm, old_pud);
+ old_ptl = pud_lock(mm, old_pud);
new_ptl = pud_lockptr(mm, new_pud);
if (new_ptl != old_ptl)
spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING);
@@ -317,11 +317,11 @@ static bool move_normal_pud(struct vm_ar
VM_BUG_ON(!pud_none(*new_pud));
pud_populate(mm, new_pud, (pmd_t *)pud_page_vaddr(pud));
- flush_pte_tlb_pwc_range(vma, old_addr, old_addr + PUD_SIZE);
if (new_ptl != old_ptl)
spin_unlock(new_ptl);
spin_unlock(old_ptl);
+ flush_pte_tlb_pwc_range(vma, old_addr, old_addr + PUD_SIZE);
return true;
}
#else
_
Patches currently in -mm which might be from aneesh.kumar@xxxxxxxxxxxxx are
mm-mremap-allow-arch-runtime-override.patch
powerpc-mm-enable-move-pmd-pud.patch
