linux-kernel - RE: [PATCH] debug: Do not permit CONFIG_DEBUG_STACK

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Date:	Sat, 28 Jul 2012 21:43:07 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Helge Deller <deller@....de>,
	"linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"Wu, Fengguang" <fengguang.wu@...el.com>
Subject: RE: [PATCH] debug: Do not permit CONFIG_DEBUG_STACK_USAGE=y on IA64
 or PARISC

> I agree with this.  Most of it looks easily fixable, but how would I
> enable the fix for ia64?  For PA it's simple: I'll just use
> CONFIG_STACK_GROWSUP, but that won't work for you.

ia64 has an ugly chicken vs. egg build dependency. When trying to build our asm-offsets.h
file (to get #define constants for various structure sizes and offsets in a format that is
usable in assembly code) we get:

include/linux/sched.h:2539: error: 'IA64_TASK_SIZE' undeclared (first use in this function)

Which is sad because IA64_TASK_SIZE is one of the #defines that asm-offsets.h is trying
to produce.

Which is why I just threw up my hands in despair and said "!IA64" for this option.

-Tony