Re: kern/60189: physio() is unnecessarily brittle

["Jason Thorpe via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR kern/60189; it has been noted by GNATS.

From: Jason Thorpe <thorpej%me.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: kern-bug-people%netbsd.org@localhost,
 gnats-admin%netbsd.org@localhost,
 netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/60189: physio() is unnecessarily brittle
Date: Mon, 13 Apr 2026 05:36:41 +0100

 > On Apr 13, 2026, at 5:25=E2=80=AFAM, thorpej%me.com@localhost via gnats =
 <gnats-admin%netbsd.org@localhost> wrote:
 >=20
 > Suggested solution: a form of uvm_fault_wire() that can enter mappings =
 for the user pages into an already-allocated physio address range as the =
 pages are wired (and thus PAs of those pages thus readily available =
 without having to ask the pmap to preserve them).
 
 Alternative solution: a form of uvm_fault_wire() that takes invokes a =
 callback for each page that gets wired, passing the PA of that page for =
 collection to be used later by vmapbuf().
 
 -- thorpej