[$] Warming up to frozen pages for networking

When the 6.14 kernel is released later this month, it will include theusual set of internal changes that users should never notice, with thepossible exception of changes that bring performance improvements. One ofthose changes is frozen pages, amemory-management optimization that should fly mostly under the radar.When Hannes Reinecke reported acrash in 6.14, though, frozen pages suddenly came into view. There is aworkaround for this problem, but it seems there is a fairamount of work to be done that nobody had counted on to solve the problemproperly.