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From: dfilter@FreeBSD.ORG (dfilter service)
Subject: Re: arm/185046: commit references a PR
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The following reply was made to PR arm/185046; it has been noted by GNATS.

From: dfilter@FreeBSD.ORG (dfilter service)
To: bug-followup@FreeBSD.org
Cc:  
Subject: Re: arm/185046: commit references a PR
Date: Fri, 27 Dec 2013 05:01:20 +0000 (UTC)

 Author: adrian
 Date: Fri Dec 27 05:01:13 2013
 New Revision: 259936
 URL: http://svnweb.freebsd.org/changeset/base/259936
 
 Log:
   Revert r252694 - which attempted to fix bit emulation for armv6/armv7.
   
   This seems to cause issues with jemalloc + {dhclient, sshd}.
   
   Thus, revert this for now until the root cause can be found and
   fixed.
   
   This should quieten some runtime problems with the Raspberry Pi.
   
   PR: kern/185046
   MFC after: 3 days
 
 Modified:
   head/sys/arm/arm/pmap-v6.c
 
 Modified: head/sys/arm/arm/pmap-v6.c
 ==============================================================================
 --- head/sys/arm/arm/pmap-v6.c	Fri Dec 27 04:30:32 2013	(r259935)
 +++ head/sys/arm/arm/pmap-v6.c	Fri Dec 27 05:01:13 2013	(r259936)
 @@ -3094,21 +3094,16 @@ validate:
  			if ((m->oflags & VPO_UNMANAGED) == 0) {
  				vm_page_aflag_set(m, PGA_WRITEABLE);
  				/*
 -				 * Enable write permission if the access type
 -				 * indicates write intention. Emulate modified
 -				 * bit otherwise.
 +				 * XXX: Skip modified bit emulation for now.
 +				 *	The emulation reveals problems
 +				 *	that result in random failures
 +				 *	during memory allocation on some
 +				 *	platforms.
 +				 *	Therefore, the page is marked RW
 +				 *	immediately.
  				 */
 -				if ((access & VM_PROT_WRITE) != 0) {
 -					npte &= ~(L2_APX);
 -					/*
 -					 * The access type and permissions
 -					 * indicate that the page will be
 -					 * written as soon as returned from
 -					 * fault service.
 -					 * Mark it dirty from the outset.
 -					 */
 -					vm_page_dirty(m);
 -				}
 +				npte &= ~(L2_APX);
 +				vm_page_dirty(m);
  			} else
  				npte &= ~(L2_APX);
  		}
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