linux-kernel - Re: [PATCH] Kconfig.debug: Add FRAME

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Date:	Fri, 30 Aug 2013 08:20:26 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Vineet Gupta <vineetg76@...il.com>
CC:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	linux-kernel@...r.kernel.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paul.mckenney@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Michel Lespinasse <walken@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Mundt <lethal@...ux-sh.org>,
	Arnd Bergmann <arnd@...db.de>,
	Chris Metcalf <cmetcalf@...era.com>
Subject: Re: [PATCH] Kconfig.debug: Add FRAME_POINTER anti-dependency for
 ARC

On 08/30/2013 12:48 AM, Vineet Gupta wrote:
> If we had ARCH_FRAME_POINTER_UNAVAILABLE (def_bool n), we could potentially remove
> ARCH_FRAME_POINTER too:
> 
> 1. arches which explicitly select ARCH_FRAME_POINTER (xtensa, parisc, arm64, x86,
> unicore32, tile) could just drop that select.
> 
> 2. Others which add themselves to config FRAME_POINTER depends on (CRIS, M68K,
> FRV, UML, AVR32, SUPERH, BLACKFIN, MN10300, METAG) can simply be removed form that
> list.
> 
> 3. Other who want to inhibit FP obviously select it (MIPS, PPC, S390, MICROBLAZE,
> ARM_UNWIND, ARC)

That all seems sane to me.

> The issue is some (sparc, c6x...) which are neither in #1 or #2, and not present
> in anti-dependency list either. e.g. With sparc64_defconfig FP is not present, but
> if I enable LATENCY_TOP, FP is enabled. For such cases, what do we make default ?

You can list multiple defaults if you want, or have them depend on other
config variables:

config FOO
	default BAR

or

config FOO
	default y if BAR
	default n if BAZ

ARCH_FRAME_POINTER_UNAVAILABLE doesn't make much sense if
FRAME_POINTER=n, right?  You can have it just plain depend on
FRAME_POINTER, I think.
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