From: Hugh Dickins <hugh@veritas.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org
Subject: i386 FRAME_POINTER needs DEBUG_MUTEXES
Date: Tue, 10 Jan 2006 17:44:32 +0000 (GMT) [thread overview]
Message-ID: <Pine.LNX.4.61.0601101718570.2942@goblin.wat.veritas.com> (raw)
I find the 2.6.15-git6 i386 CONFIG_FRAME_POINTER=y doesn't work unless
CONFIG_DEBUG_MUTEXES=y, because of the __mutex_fastpath jumps to fail_fn
(giving two pushes of %ebp to one pop). Whereas x86_64 __mutex_fastpaths
use calls and work with FRAME_POINTER=y. Whether i386 deserves asm mods
rather than Kconfigery to force one from other, I've no strong instinct.
Hugh
next reply other threads:[~2006-01-10 17:44 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-10 17:44 Hugh Dickins [this message]
2006-01-10 21:07 ` [patch] fix i386 mutex fastpath on FRAME_POINTER && !DEBUG_MUTEXES Ingo Molnar
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