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Date:      Thu, 5 Jul 2018 16:27:34 +0000 (UTC)
From:      Konstantin Belousov <kib@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r335996 - in head/sys: amd64/amd64 i386/i386
Message-ID:  <201807051627.w65GRZ4q039106@repo.freebsd.org>
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Author: kib
Date: Thu Jul  5 16:27:34 2018
New Revision: 335996
URL: https://svnweb.freebsd.org/changeset/base/335996

Log:
  In x86 pmap_extract_and_hold(), there is no need to recalculate the
  physical address, which is readily available after sucessfull
  vm_page_pa_tryrelock().
  
  Noted and reviewed by:	alc
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week
  Differential revision:	https://reviews.freebsd.org/D16085

Modified:
  head/sys/amd64/amd64/pmap.c
  head/sys/i386/i386/pmap.c

Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c	Thu Jul  5 16:25:48 2018	(r335995)
+++ head/sys/amd64/amd64/pmap.c	Thu Jul  5 16:27:34 2018	(r335996)
@@ -2307,8 +2307,7 @@ retry:
 				if (vm_page_pa_tryrelock(pmap, (pde &
 				    PG_PS_FRAME) | (va & PDRMASK), &pa))
 					goto retry;
-				m = PHYS_TO_VM_PAGE((pde & PG_PS_FRAME) |
-				    (va & PDRMASK));
+				m = PHYS_TO_VM_PAGE(pa);
 				vm_page_hold(m);
 			}
 		} else {
@@ -2318,7 +2317,7 @@ retry:
 				if (vm_page_pa_tryrelock(pmap, pte & PG_FRAME,
 				    &pa))
 					goto retry;
-				m = PHYS_TO_VM_PAGE(pte & PG_FRAME);
+				m = PHYS_TO_VM_PAGE(pa);
 				if (m != NULL)
 					vm_page_hold(m);
 			}

Modified: head/sys/i386/i386/pmap.c
==============================================================================
--- head/sys/i386/i386/pmap.c	Thu Jul  5 16:25:48 2018	(r335995)
+++ head/sys/i386/i386/pmap.c	Thu Jul  5 16:27:34 2018	(r335996)
@@ -1672,8 +1672,7 @@ retry:
 				if (vm_page_pa_tryrelock(pmap, (pde &
 				    PG_PS_FRAME) | (va & PDRMASK), &pa))
 					goto retry;
-				m = PHYS_TO_VM_PAGE((pde & PG_PS_FRAME) |
-				    (va & PDRMASK));
+				m = PHYS_TO_VM_PAGE(pa);
 				vm_page_hold(m);
 			}
 		} else {
@@ -1683,7 +1682,7 @@ retry:
 				if (vm_page_pa_tryrelock(pmap, pte & PG_FRAME,
 				    &pa))
 					goto retry;
-				m = PHYS_TO_VM_PAGE(pte & PG_FRAME);
+				m = PHYS_TO_VM_PAGE(pa);
 				if (m != NULL)
 					vm_page_hold(m);
 			}

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