From: Yinghai Lu <yinghai@kernel.org>
To: Avery Pennarun <apenwarr@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Josh Triplett <josh@joshtriplett.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Ingo Molnar <mingo@elte.hu>,
"David S. Miller" <davem@davemloft.net>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
"Fabio M. Di Nitto" <fdinitto@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Olaf Hering <olaf@aepfle.de>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Tejun Heo <tj@kernel.org>, "H. Peter Anvin" <hpa@linux.intel.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 4/5] printk: use alloc_bootmem() instead of memblock_alloc().
Date: Tue, 13 Mar 2012 14:50:34 -0700 [thread overview]
Message-ID: <CAE9FiQVkn_jHhdFfDg_zvJJuZci+kvOd6NSfL4aSc_GP=hiOWw@mail.gmail.com> (raw)
In-Reply-To: <CAHqTa-0b1DBDNYzDQ6UHHCivF9S-H3zvZWH0KZ21OQ8gQq6WYg@mail.gmail.com>
On Mon, Mar 12, 2012 at 11:40 PM, Avery Pennarun <apenwarr@gmail.com> wrote:
>> that seems not right.
>>
>> for x86, setup_log_buf(1) is quite early called in setup_arch() before
>> bootmem is there.
>>
>> bootmem should be killed after memblock is supported for arch that
>> current support bootmem.
>
> Hmm. x86 uses nobootmem.c, which implements bootmem in terms of
> memblock anyway. It is definitely working at setup_log_buf() time (or
> else it wouldn't be able to select a sensible buffer location).
ok, you may could do that now.
only after recent changes from Tejun, that kill early_node_map().
before that, we only can use nobootmem after
arch/x86/kernel/setup.c::setup_arch/initmem_init()
but memblock alloc could be used just after
arch/x86/kernel/setup.c::setup_arch/memblock_x86_fill()
Now you put back bootmem calling early, will cause confusion.
>
> I suppose you're saying that it wouldn't work for a hypothetical
> architecture that *does* support bootmem and *also* supports
> setup_log_buf(1). Will there ever be such an architecture, or will
> bootmem be retired first?
we should use adding memblock_alloc calling instead... go backward...
Thanks
Yinghai
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next prev parent reply other threads:[~2012-03-13 21:50 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-13 5:36 [PATCH 0/5] Persist printk buffer across reboots Avery Pennarun
2012-03-13 5:36 ` [PATCH 1/5] mm: bootmem: BUG() if you try to allocate bootmem too late Avery Pennarun
2012-03-13 5:36 ` [PATCH 2/5] mm: bootmem: it's okay to reserve_bootmem an invalid address Avery Pennarun
2012-03-13 5:36 ` [PATCH 3/5] mm: nobootmem: implement reserve_bootmem() in terms of memblock Avery Pennarun
2012-03-13 5:36 ` [PATCH 4/5] printk: use alloc_bootmem() instead of memblock_alloc() Avery Pennarun
2012-03-13 6:13 ` Yinghai Lu
2012-03-13 6:40 ` Avery Pennarun
2012-03-13 8:26 ` Ingo Molnar
2012-03-13 21:50 ` Yinghai Lu [this message]
2012-03-14 2:23 ` Avery Pennarun
2012-03-13 5:36 ` [PATCH 5/5] printk: CONFIG_PRINTK_PERSIST: persist printk buffer across reboots Avery Pennarun
2012-03-13 5:53 ` [PATCH 0/5] Persist " David Miller
2012-03-13 6:00 ` Avery Pennarun
2012-03-13 6:50 ` David Miller
2012-03-13 7:14 ` Avery Pennarun
2012-03-13 7:18 ` David Miller
2012-03-13 8:10 ` Avery Pennarun
2012-03-13 8:16 ` David Miller
2012-03-13 13:50 ` Peter Zijlstra
2012-03-14 1:57 ` Daniel Walker
2012-03-13 8:32 ` Stephen Boyd
2012-03-13 17:08 ` Daniel Walker
2012-03-13 22:10 ` Andrew Morton
2012-03-14 2:19 ` Daniel Walker
2012-03-15 22:10 ` Seiji Aguchi
2012-03-14 2:21 ` Avery Pennarun
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