From: Ingo Molnar <mingo@elte.hu>
To: Andrew Morton <akpm@linux-foundation.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Akinobu Mita <akinobu.mita@gmail.com>,
Alexander Beregalov <a.beregalov@gmail.com>,
"linux-next@vger.kernel.org" <linux-next@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-arch@vger.kernel.org,
"David S. Miller" <davem@davemloft.net>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH] build fix for generic debug pagealloc
Date: Fri, 3 Apr 2009 18:44:50 +0200 [thread overview]
Message-ID: <20090403164450.GC3047@elte.hu> (raw)
In-Reply-To: <20090402094522.b29004c8.akpm@linux-foundation.org>
* Andrew Morton <akpm@linux-foundation.org> wrote:
> > +config DEBUG_PAGEALLOC
> > + bool "Debug page memory allocations"
> > + depends on DEBUG_KERNEL && ARCH_SUPPORTS_DEBUG_PAGEALLOC
> > + depends on !HIBERNATION || !PPC && !SPARC
> > + ---help---
> > + Unmap pages from the kernel linear mapping after free_pages().
> > + This results in a large slowdown, but helps to find certain types
> > + of memory corruptions.
> > +
>
> I guess this is why it wasn't discovered in my compile testing.
> It's quite regrettable that `make allmodconfig' didn't enable the
> feature. That's what allmodconfig is for.
Hm, i _do_ remember some hibernation magic fix from Rafael, in the
area of debugalloc. Many months ago.
Rafael, is it supposed to work? If yes, i think we should unblock
it.
Ingo
next prev parent reply other threads:[~2009-04-03 16:44 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-02 11:21 next-0402: build fails at mm/debug-pagealloc.c Alexander Beregalov
2009-04-02 11:21 ` Alexander Beregalov
2009-04-02 16:31 ` [PATCH] build fix for generic debug pagealloc Akinobu Mita
2009-04-02 16:31 ` Akinobu Mita
2009-04-02 16:45 ` Andrew Morton
2009-04-03 16:44 ` Ingo Molnar [this message]
2009-04-03 16:44 ` Ingo Molnar
2009-04-03 20:38 ` Rafael J. Wysocki
2009-04-08 13:05 ` Ingo Molnar
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