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NAME
     vm_page_protect - lower a page’s protection


SYNOPSIS
     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/vm_page.h>

     void
     vm_page_protect(vm_page_t mem, int prot);


DESCRIPTION
     The vm_page_protect() function lowers a page’s protection.  The
     protection is never raised by this function; therefore, if the page is
     already at VM_PROT_NONE, the function does nothing.

     Its arguments are:

     mem   The page whose protection is lowered.

     prot  The protection the page should be reduced to.  If VM_PROT_NONE is
           specified, then the PG_WRITABLE and PG_MAPPED flags are cleared and
           the pmap_page’s protection is set to VM_PROT_NONE.  If VM_PROT_READ
           is specified, then the PG_WRITABLE flag is cleared and the
           pmap_page’s protection is set to VM_PROT_READ.

     Higher protection requests are ignored.


AUTHORS
     This manual page was written by Chad David 〈davidc@acns.ab.ca〉.