svn commit: r285046 - head/sys/vm

[Konstantin Belousov]

Author: kib
Date: Thu Jul  2 15:22:13 2015
New Revision: 285046
URL: https://svnweb.freebsd.org/changeset/base/285046

Log:
  Account for the main process stack being one page below the highest
  user address when ABI uses shared page.
  
  Note that the change is no-op for correctness, since shared page does
  not fault.  The mapping for the shared page is installed at the
  address space creation, the page is unmanaged and its pte/pv entry
  cannot be reclaimed.
  
  Submitted by:	Oliver Pinter
  Review:	https://reviews.freebsd.org/D2954
  MFC after:	1 week

Modified:
  head/sys/vm/vm_map.c

Modified: head/sys/vm/vm_map.c
==============================================================================
--- head/sys/vm/vm_map.c	Thu Jul  2 15:17:30 2015	(r285045)
+++ head/sys/vm/vm_map.c	Thu Jul  2 15:22:13 2015	(r285046)
@@ -3640,7 +3640,8 @@ Retry:
 		return (KERN_NO_SPACE);
 	}
 
-	is_procstack = (addr >= (vm_offset_t)vm->vm_maxsaddr) ? 1 : 0;
+	is_procstack = (addr >= (vm_offset_t)vm->vm_maxsaddr &&
+	    addr < (vm_offset_t)p->p_sysent->sv_usrstack) ? 1 : 0;
 
 	/*
 	 * If this is the main process stack, see if we're over the stack