CVS commit: [netbsd-8] src/sys/uvm

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Sat Apr  1 16:01:52 UTC 2023

Modified Files:
        src/sys/uvm [netbsd-8]: uvm_map.c

Log Message:
Pull up following revision(s) (requested by riastradh in ticket #1815):

        sys/uvm/uvm_map.c: revision 1.395

uvm(9): Fix 19-year-old bug in assertion about mmap hint.

Previously this would _first_ remember the original hint, and _then_
clamp the hint to the VM map's range:

        orig_hint = hint;
        if (hint < vm_map_min(map)) {   /* check ranges ... */
                if (flags & UVM_FLAG_FIXED) {
                        UVMHIST_LOG(maphist,"<- VA below map range",0,0,0,0);
                        return (NULL);
                }
                hint = vm_map_min(map);
        ...
        KASSERTMSG(!topdown || hint <= orig_hint, "hint: %#jx, orig_hint: %#jx",
            (uintmax_t)hint, (uintmax_t)orig_hint);

Even if nothing else happens in the ellipsis, taking the branch
guarantees the assertion will fail in the topdown case.


To generate a diff of this commit:
cvs rdiff -u -r1.351.2.3 -r1.351.2.4 src/sys/uvm/uvm_map.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.