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Subject[PATCH 0/4] hmm: fixes and documentations v2
From: Jérôme Glisse <>

Removed pointless VM_BUG_ON() cced stable when appropriate and splitted
the last patch into _many_ smaller patches to make it easier to review.
The end result is same modulo comments i received so far and the extra
documentation i added while splitting thing up. Below is previous cover
letter (everything in it is still true):


All patches only impact HMM user, there is no implication outside HMM.

First patch improve documentation to better reflect what HMM is. Second
patch fix #if/#else placement in hmm.h. The third patch add a call on
mm release which helps device driver who use HMM to clean up early when
a process quit. Finaly last patch modify the CPU snapshot and page fault
helper to simplify device driver. The nouveau patchset i posted last
week already depends on all of those patches.

You can find them in a hmm-for-4.17 branch:


Cc: Ralph Campbell <>
Cc: Evgeny Baskakov <>
Cc: Mark Hairgrove <>
Cc: John Hubbard <>

Jérôme Glisse (12):
mm/hmm: fix header file if/else/endif maze
mm/hmm: hmm_pfns_bad() was accessing wrong struct
mm/hmm: use struct for hmm_vma_fault(), hmm_vma_get_pfns() parameters
mm/hmm: remove HMM_PFN_READ flag and ignore peculiar architecture
mm/hmm: use uint64_t for HMM pfn instead of defining hmm_pfn_t to
mm/hmm: cleanup special vma handling (VM_SPECIAL)
mm/hmm: do not differentiate between empty entry or missing directory
mm/hmm: move hmm_pfns_clear() closer to where it is use
mm/hmm: factor out pte and pmd handling to simplify hmm_vma_walk_pmd()
mm/hmm: change hmm_vma_fault() to allow write fault on page basis
mm/hmm: use device driver encoding for HMM pfn

Ralph Campbell (2):
mm/hmm: documentation editorial update to HMM documentation
mm/hmm: HMM should have a callback before MM is destroyed v2

Documentation/vm/hmm.txt | 360 +++++++++++++++++-----------------
include/linux/hmm.h | 156 ++++++++-------
mm/hmm.c | 495 +++++++++++++++++++++++++++++------------------
4 files changed, 582 insertions(+), 430 deletions(-)


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