linux-kernel - Re: [PATCH 4/5] printk: use alloc_bootmem() instead of memblock

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Message-ID: <CAHqTa-0b1DBDNYzDQ6UHHCivF9S-H3zvZWH0KZ21OQ8gQq6WYg@mail.gmail.com>
Date:	Tue, 13 Mar 2012 02:40:50 -0400
From:	Avery Pennarun <apenwarr@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Josh Triplett <josh@...htriplett.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	"David S. Miller" <davem@...emloft.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Fabio M. Di Nitto" <fdinitto@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Olaf Hering <olaf@...fle.de>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Tejun Heo <tj@...nel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 4/5] printk: use alloc_bootmem() instead of memblock_alloc().

> 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).

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?

Thanks,

Avery
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