linux-kernel - Re: [PATCH 1/6] printk: Allocate kernel log buffer earlier

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Message-Id: <20110120155021.c39387c3.akpm@linux-foundation.org>
Date:	Thu, 20 Jan 2011 15:50:21 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mike Travis <travis@....com>
Cc:	Ingo Molnar <mingo@...e.hu>, Len Brown <len.brown@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jack Steiner <steiner@....com>, Robin Holt <holt@....com>,
	Lori Gilbertson <loriann@....com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 1/6] printk: Allocate kernel log buffer earlier

On Wed, 19 Jan 2011 17:01:07 -0600
Mike Travis <travis@....com> wrote:

> On larger systems, because of the numerous ACPI, Bootmem and EFI
> messages, the static log buffer overflows before the larger one
> specified by the log_buf_len param is allocated.  Minimize the
> overflow by allocating the new log buffer as soon as possible.
> 
> All arch's are covered by the "setup_log_buf" in start_kernel().
> The x86 arch allocates it right after bootmem is created.
> 
> ...
>
> +void setup_log_buf(void);
>
> ...
>
> +void __init setup_log_buf(void)
>

It's a PITA but the declaration should have the __init tag as well.  We
have had at least one instance where failing to do this caused an arch
(arm) to emit a short-mode address offset to a function which it
thought was in the same section as the callsite.  Only the target was
in a different section from the callsite and the linker couldn't fit
the needed offset into the operand.

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