From: Aron Griffis <agriffis@redhat.com>
Date: Fri, 14 Sep 2007 01:53:35 -0400
Subject: [ia64] remove stack hard limit
Message-id: 20070914055334.GY5505@redhat.com
O-Subject: [RHEL5.1 PATCH] BZ 251043 remove ia64 stack hard limit
Bugzilla: 251043

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=251043

Description
-----------
Remove stack hard limit on ia64.  This is the direct application of an
upstream commit from May 2007.
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d826393cdebe340b3716002bfb1298ab19b57e83

RHTS test rh-tests-kernel-misc-ktst_msg presently fails on ia64 xen
guests.  Kei Tokunaga provides a complete analysis of the reason in BZ
251043.  In a nutshell, we haven't seen this before because nobody
runs ia64 bare metal with only 500M memory, but this configuration can
occur in a xen guest.  The combination of limited memory with this
historical hard limit causes the test failure.

Test Status
-----------
I've boot-tested 2.6.18-47 plus this patch on rx6600, both bare metal
and xen.  ulimit -Hs shows the default stack limit is now unlimited.

I have not yet run the RHTS test in question using this kernel because
I don't know the system.  (I think I need to do a brew build then
schedule the job via http://rhts.lab.boston.redhat.com/ but I haven't
ever done either of these before, so I could use some coaching or
a howto pointer)

I'll send a followup with the RHTS results when I have them.

Proposed Patch
--------------
Please review and ACK for RHEL5.1, pending RHTS results.
I'm posting immediately since this is presently a RHEL5.1 blocker.

linux-2.6-ia64-remove-stack-hard-limit.patch

Acked-by: Jarod Wilson <jwilson@redhat.com>
---
 include/asm-ia64/resource.h |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/include/asm-ia64/resource.h b/include/asm-ia64/resource.h
index 77b1eee..ba2272a 100644
--- a/include/asm-ia64/resource.h
+++ b/include/asm-ia64/resource.h
@@ -2,7 +2,6 @@
 #define _ASM_IA64_RESOURCE_H
 
 #include <asm/ustack.h>
-#define _STK_LIM_MAX	DEFAULT_USER_STACK_SIZE
 #include <asm-generic/resource.h>
 
 #endif /* _ASM_IA64_RESOURCE_H */
-- 
1.5.3.5.645.gbb47