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RJLHXdUS1g02DBNd5iDHQF4VLQNBNMFi1vnwJFHnNyERRlvnP7tP1hNe27OdvV1j/eH/q1/sz79 sSOsfounBYBgwBFQcaQS1zoSb9OninCxVjeNdwz9osIvYAdeWyKN+V7aw5S596YLnuck7dHtixs XmhYdmOn84TdGQ9cvazAcTaG821hDyE08BLyIQHjj6aRmKcwS8gm4lg+gw+Q9MVRX3jMAaAIimm F8AwvJ2J2Q3T1p57zVYIBBIwyKluKj6l8sbZ0mtrRcFsCe0MZh0= X-Proofpoint-GUID: 17QPIN73sSukKG4szDwWY2M74VTwO3LJ X-Authority-Analysis: v=2.4 cv=ReCdyltv c=1 sm=1 tr=0 ts=68ee1e80 b=1 cx=c_pps a=qoll8+KPOyaMroiJ2sR5sw==:117 a=qoll8+KPOyaMroiJ2sR5sw==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10 a=x6icFKpwvdMA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=yPCof4ZbAAAA:8 a=UWAWf51EsFS9SconwKIA:9 a=CjuIK1q_8ugA:10 cc=ntf awl=host:12092 X-Proofpoint-ORIG-GUID: 17QPIN73sSukKG4szDwWY2M74VTwO3LJ On Tue, Oct 14, 2025 at 10:41:18AM +0100, Pedro Falcato wrote: > On Mon, Oct 13, 2025 at 05:58:36PM +0100, Lorenzo Stoakes wrote: > > Commit b714ccb02a76 ("mm/mremap: complete refactor of move_vma()") > > mistakenly introduced a new behaviour - clearing the VM_ACCOUNT flag of the > > old mapping when a mapping is mremap()'d with the MREMAP_DONTUNMAP flag > > set. > > > > While we always clear the VM_LOCKED and VM_LOCKONFAULT flags for the old > > mapping (the page tables have been moved, so there is no data that could > > possibly be locked in memor), there is no reason to touch any other VMA > memory > > flags. > > > > This is because after the move the old mapping is in a state as if it were > > freshly mapped. This implies that the attributes of the mapping ought to > > remain the same, including whether or not the mapping is accounted. > > > > Signed-off-by: Lorenzo Stoakes > > Reviewed-by: Pedro Falcato Thanks! > > Looks good, thanks! Should we add a test for it? I considered that, but this is fundamental behaviour and so is very unlikely to regress so doesn't seem really worth it. > > -- > Pedro Cheers, Lorenzo