From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
I've had these in my work queue for a bit, nothing profound here, just some
small edits for clarity.
Ralph's hmm tester will need a small diff to work after this - which
illustrates how setting default_flags == 0 is the same as what was called
SNAPSHOT:
diff --git a/lib/test_hmm.c b/lib/test_hmm.c
index 6ca953926dc13f..5f31f5b3e64cb9 100644
--- a/lib/test_hmm.c
+++ b/lib/test_hmm.c
@@ -300,7 +300,7 @@ static int dmirror_range_fault(struct dmirror *dmirror,
range->notifier_seq = mmu_interval_read_begin(range->notifier);
down_read(&mm->mmap_sem);
- count = hmm_range_fault(range, 0);
+ count = hmm_range_fault(range);
up_read(&mm->mmap_sem);
if (count <= 0) {
if (count == 0 || count == -EBUSY)
@@ -337,8 +337,7 @@ static int dmirror_fault(struct dmirror *dmirror, unsigned long start,
.flags = dmirror_hmm_flags,
.values = dmirror_hmm_values,
.pfn_shift = DPT_SHIFT,
- .pfn_flags_mask = ~(dmirror_hmm_flags[HMM_PFN_VALID] |
- dmirror_hmm_flags[HMM_PFN_WRITE]),
+ .pfn_flags_mask = 0,
.default_flags = dmirror_hmm_flags[HMM_PFN_VALID] |
(write ? dmirror_hmm_flags[HMM_PFN_WRITE] : 0),
.dev_private_owner = dmirror->mdevice,
@@ -872,7 +871,7 @@ static int dmirror_range_snapshot(struct dmirror *dmirror,
range->notifier_seq = mmu_interval_read_begin(range->notifier);
down_read(&mm->mmap_sem);
- count = hmm_range_fault(range, HMM_FAULT_SNAPSHOT);
+ count = hmm_range_fault(range);
up_read(&mm->mmap_sem);
if (count <= 0) {
if (count == 0 || count == -EBUSY)
@@ -916,7 +915,7 @@ static int dmirror_snapshot(struct dmirror *dmirror,
.flags = dmirror_hmm_flags,
.values = dmirror_hmm_values,
.pfn_shift = DPT_SHIFT,
- .pfn_flags_mask = ~0ULL,
+ .pfn_flags_mask = 0,
.dev_private_owner = dmirror->mdevice,
};
int ret = 0;
Jason Gunthorpe (6):
mm/hmm: remove pgmap checking for devmap pages
mm/hmm: return the fault type from hmm_pte_need_fault()
mm/hmm: remove unused code and tidy comments
mm/hmm: remove HMM_FAULT_SNAPSHOT
mm/hmm: remove the CONFIG_TRANSPARENT_HUGEPAGE #ifdef
mm/hmm: use device_private_entry_to_pfn()
Documentation/vm/hmm.rst | 12 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 2 +-
drivers/gpu/drm/nouveau/nouveau_svm.c | 2 +-
include/linux/hmm.h | 55 +-----
mm/hmm.c | 238 +++++++++---------------
5 files changed, 98 insertions(+), 211 deletions(-)
--
2.25.1
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