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| author | Brian Geffon <[email protected]> | 2025-02-26 16:23:41 +0000 |
|---|---|---|
| committer | Andrew Morton <[email protected]> | 2025-03-06 05:36:18 +0000 |
| commit | 34b82f33cf3f03bc39e9a205a913d790e1520ade (patch) | |
| tree | 39da404285db9b2751977f39f699843b14727f94 /tools/testing/selftests/kvm/x86/nested_exceptions_test.c | |
| parent | mm: don't skip arch_sync_kernel_mappings() in error paths (diff) | |
| download | kernel-34b82f33cf3f03bc39e9a205a913d790e1520ade.tar.gz kernel-34b82f33cf3f03bc39e9a205a913d790e1520ade.zip | |
mm: fix finish_fault() handling for large folios
When handling faults for anon shmem finish_fault() will attempt to install
ptes for the entire folio. Unfortunately if it encounters a single
non-pte_none entry in that range it will bail, even if the pte that
triggered the fault is still pte_none. When this situation happens the
fault will be retried endlessly never making forward progress.
This patch fixes this behavior and if it detects that a pte in the range
is not pte_none it will fall back to setting a single pte.
[[email protected]: tweak whitespace]
Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Fixes: 43e027e41423 ("mm: memory: extend finish_fault() to support large folio")
Signed-off-by: Brian Geffon <[email protected]>
Suggested-by: Baolin Wang <[email protected]>
Reported-by: Marek Maslanka <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Hugh Dickens <[email protected]>
Cc: Kefeng Wang <[email protected]>
Cc: Matthew Wilcow (Oracle) <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Zi Yan <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Diffstat (limited to 'tools/testing/selftests/kvm/x86/nested_exceptions_test.c')
0 files changed, 0 insertions, 0 deletions