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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