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9BkARWLUqLEI2xse3h9gALO030Tz6sOOSc80+P2anwJMA3/xvznc9NGCmsKxkHvki5mt0gkx4nLeC7BAl5aU2e+31pEX2lo0v970kA6+r3VaelRHAxkZHfbx6fF2J/3zp8B1sUtlAAFfaIawMgtzBIYBFvBNvYFzKhMylOu9LzGqcjhTZ8bsYzN72DGuR3xq/2CNflac5YGIq5PT+CBt62NemjCZ/Ty/iX2/S9SVzfIquzjl4ZnQtMv6hfurZkVFvVAiJC+Z9/KLgCsXHL1dh4PX3iipUpYCvsBCimcrOK+p6+Zm8veZ6z6+fTe7uVawEcKQhZ478PjIjiv3APFovhX8G4XBFddSqIh4zPgwg0+6wu+CLiAtL1iG7fZAr3MzbLITUUdTEoJND2WW5CpJBMmZRkLPkfrXoO9KnQX9WzHeO8cebvxqs0f2Bi/nZQ0gCkSPcGPUCQqoT3JXgC6Qe3P/ZlA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed Aug 12, 2026 at 2:48 PM EDT, Kairui Song via B4 Relay wrote: > From: Kairui Song > > A folio in the swap cache cannot be split if it has a mapping (shmem). > The split code does a defensive check for this in > __folio_freeze_and_split_unmapped, after the folio ref has been frozen > and the NR_SHMEM_THPS/NR_FILE_THPS counters have been decremented. It > rejects the split and returns -EINVAL without unfreezing the folio or > restoring the counters. That error path is buggy: if it is ever taken, > it leaves the folio frozen and stuck, skews the counters, and fires > the VM_WARN_ON_ONCE_FOLIO for a state that is actually legitimate. > > Check for this case up front in folio_check_splittable and return > -EBUSY before any state is modified, so the split routine always backs > out cleanly. > > Also fix a bracket style issue that checkpatch.pl keeps complaining > about. > > Fixes: 00527733d0dc ("mm/huge_memory: add two new (not yet used) function= s for folio_split()") > Fixes: 714b056c8321 ("mm/huge_memory: convert VM_BUG* to VM_WARN* in __fo= lio_split") > Signed-off-by: Kairui Song > --- > mm/huge_memory.c | 27 ++++++++++++++++----------- > 1 file changed, 16 insertions(+), 11 deletions(-) > The handling is an improvement. Thanks. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi