On Fri, Jul 25, 2025 at 10:44:59PM +0200, Alejandro Colomar wrote: > Hi Lorenzo, > > On Wed, Jul 23, 2025 at 06:46:34PM +0100, Lorenzo Stoakes wrote: > > There is pre-existing logic that appears to be undocumented for an mremap() > > shrink operation, where it turns out that the usual 'input range must span > > a single mapping' requirement no longer applies. > > > > In fact, it turns out that the input range specified by [old_address, > > old_size) may span any number of mappings, as long old_address resides at > > or within a mapping and [old_address, new_size) spans only a single > > mapping. > > > > Explicitly document this. > > > > In addition, document the new behaviour introduced in Linux 6.17 whereby it > > is now possible to move multiple mappings in a single operation, as long as > > the operation is purely a move, that is old_size is equal to new_size and > > MREMAP_FIXED is specified. > > Please separate the new behavior into a separate patch. Each patch > should change one thing only. OK will split and send two separate patches. Since this will cause merge pain otherwise, I'll send it as a series.
