svn commit: r348627 - stable/12/sys/riscv/riscv

[Ruslan Bukin]

Author: br
Date: Tue Jun  4 15:42:30 2019
New Revision: 348627
URL: https://svnweb.freebsd.org/changeset/base/348627

Log:
  MFC r347427:
  
  RISC-V ISA does not specify how to manage physical memory attributes (PMA).
  So do nothing in pmap_page_set_memattr() and don't panic.
  
  Sponsored by:	DARPA, AFRL

Modified:
  stable/12/sys/riscv/riscv/pmap.c

Modified: stable/12/sys/riscv/riscv/pmap.c
==============================================================================
--- stable/12/sys/riscv/riscv/pmap.c	Tue Jun  4 15:40:30 2019	(r348626)
+++ stable/12/sys/riscv/riscv/pmap.c	Tue Jun  4 15:42:30 2019	(r348627)
@@ -3122,16 +3122,6 @@ pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma)
 {
 
 	m->md.pv_memattr = ma;
-
-	/*
-	 * RISCVTODO: Implement the below (from the amd64 pmap)
-	 * If "m" is a normal page, update its direct mapping.  This update
-	 * can be relied upon to perform any cache operations that are
-	 * required for data coherence.
-	 */
-	if ((m->flags & PG_FICTITIOUS) == 0 &&
-	    PHYS_IN_DMAP(VM_PAGE_TO_PHYS(m)))
-		panic("RISCVTODO: pmap_page_set_memattr");
 }
 
 /*