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From: Justin Hibbits <jhibbits@FreeBSD.org>
Date: Wed, 13 Nov 2013 01:37:53 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r258078 - head/sys/powerpc/include
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Author: jhibbits
Date: Wed Nov 13 01:37:52 2013
New Revision: 258078
URL: http://svnweb.freebsd.org/changeset/base/258078

Log:
  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
  MFC after:	1 week

Modified:
  head/sys/powerpc/include/param.h

Modified: head/sys/powerpc/include/param.h
==============================================================================
--- head/sys/powerpc/include/param.h	Wed Nov 13 01:04:02 2013	(r258077)
+++ head/sys/powerpc/include/param.h	Wed Nov 13 01:37:52 2013	(r258078)
@@ -104,7 +104,11 @@
 #define	MAXPAGESIZES	1		/* maximum number of supported page sizes */
 
 #ifndef KSTACK_PAGES
-#define	KSTACK_PAGES		4		/* includes pcb */
+#ifdef __powerpc64__
+#define	KSTACK_PAGES		8		/* includes pcb */
+#else
+#define	KSTACK_PAGES		8		/* 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 */