More uvm_pagefree() lock fixes

[Martin Pieuchot]

As recently pointed out by jmatthew@ these need the lock as well, ok?

Index: uvm/uvm_km.c
===================================================================
RCS file: /cvs/src/sys/uvm/uvm_km.c,v
retrieving revision 1.137
diff -u -p -r1.137 uvm_km.c
--- uvm/uvm_km.c        23 May 2020 06:15:09 -0000      1.137
+++ uvm/uvm_km.c        1 Dec 2020 14:00:38 -0000
@@ -291,7 +291,9 @@ uvm_km_pgremove_intrsafe(vaddr_t start, 
                pg = PHYS_TO_VM_PAGE(pa);
                if (pg == NULL)
                        panic("uvm_km_pgremove_intrsafe: no page");
+               uvm_lock_pageq();
                uvm_pagefree(pg);
+               uvm_unlock_pageq();
        }
 }
 
@@ -799,7 +801,9 @@ uvm_km_doputpage(struct uvm_km_free_page
        if (freeva)
                uvm_unmap(kernel_map, va, va + PAGE_SIZE);
 
+       uvm_lock_pageq();
        uvm_pagefree(pg);
+       uvm_unlock_pageq();
        return (nextfp);
 }
 #endif /* !__HAVE_PMAP_DIRECT */