svn commit: r271153 - stable/10/sys/powerpc/include

[Justin Hibbits]

Author: jhibbits
Date: Fri Sep  5 05:07:38 2014
New Revision: 271153
URL: http://svnweb.freebsd.org/changeset/base/271153

Log:
  MFC r258078,258079
  
  Increase the stack size for ppc64 from 4 pages to 8.
  
  I found a stack overflow when a coredump was taken onto a ZFS volume with
  heavy network activity.  2 DSI traps, plus one DECR trap, along with several
  function calls in the stack, overflowed the 4 pages.  8 page stack fixes this.
  
  Discussed with: nwhitehorn
  Approved by:	re
  Relnotes:	yes

Modified:
  stable/10/sys/powerpc/include/param.h
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/sys/powerpc/include/param.h
==============================================================================
--- stable/10/sys/powerpc/include/param.h	Fri Sep  5 03:33:16 2014	(r271152)
+++ stable/10/sys/powerpc/include/param.h	Fri Sep  5 05:07:38 2014	(r271153)
@@ -104,8 +104,12 @@
 #define	MAXPAGESIZES	1		/* maximum number of supported page sizes */
 
 #ifndef KSTACK_PAGES
+#ifdef __powerpc64__
+#define	KSTACK_PAGES		8		/* includes pcb */
+#else
 #define	KSTACK_PAGES		4		/* includes pcb */
 #endif
+#endif
 #define	KSTACK_GUARD_PAGES	1	/* pages of kstack guard; 0 disables */
 #define	USPACE		(KSTACK_PAGES * PAGE_SIZE)	/* total size of pcb */