The patch titled
Subject: mm/hmm: do not ignore specific pte fault flag in hmm_vma_fault()
has been added to the -mm tree. Its filename is
mm-hmm-use-device-driver-encoding-for-hmm-pfn-v2-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-hmm-use-device-driver-encoding-for-hmm-pfn-v2-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-hmm-use-device-driver-encoding-for-hmm-pfn-v2-fix.patch
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------------------------------------------------------
From: Ralph Campbell <rcampbell@xxxxxxxxxx>
Subject: mm/hmm: do not ignore specific pte fault flag in hmm_vma_fault()
Save requested fault flags from caller supplied pfns array before
overwriting it with the special none value. Without this we would not
fault on all cases requested by caller, leading to caller calling us in a
loop unless something else did change the CPU page table.
Link: http://lkml.kernel.org/r/20180326213009.2460-2-jglisse@xxxxxxxxxx
Signed-off-by: Ralph Campbell <rcampbell@xxxxxxxxxx>
Signed-off-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
Cc: Evgeny Baskakov <ebaskakov@xxxxxxxxxx>
Cc: Mark Hairgrove <mhairgrove@xxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/hmm.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff -puN mm/hmm.c~mm-hmm-use-device-driver-encoding-for-hmm-pfn-v2-fix mm/hmm.c
--- a/mm/hmm.c~mm-hmm-use-device-driver-encoding-for-hmm-pfn-v2-fix
+++ a/mm/hmm.c
@@ -498,10 +498,11 @@ static int hmm_vma_handle_pte(struct mm_
bool fault, write_fault;
uint64_t cpu_flags;
pte_t pte = *ptep;
+ uint64_t orig_pfn = *pfn;
*pfn = range->values[HMM_PFN_NONE];
cpu_flags = pte_to_hmm_pfn_flags(range, pte);
- hmm_pte_need_fault(hmm_vma_walk, *pfn, cpu_flags,
+ hmm_pte_need_fault(hmm_vma_walk, orig_pfn, cpu_flags,
&fault, &write_fault);
if (pte_none(pte)) {
@@ -528,7 +529,7 @@ static int hmm_vma_handle_pte(struct mm_
range->flags[HMM_PFN_DEVICE_PRIVATE];
cpu_flags |= is_write_device_private_entry(entry) ?
range->flags[HMM_PFN_WRITE] : 0;
- hmm_pte_need_fault(hmm_vma_walk, *pfn, cpu_flags,
+ hmm_pte_need_fault(hmm_vma_walk, orig_pfn, cpu_flags,
&fault, &write_fault);
if (fault || write_fault)
goto fault;
_
Patches currently in -mm which might be from rcampbell@xxxxxxxxxx are
mm-hmm-documentation-editorial-update-to-hmm-documentation.patch
mm-hmm-hmm-should-have-a-callback-before-mm-is-destroyed-v3.patch
mm-hmm-use-device-driver-encoding-for-hmm-pfn-v2-fix.patch
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