linux-kernel - RE: [PATCH -v2 2/3] ACPI, APEI, Add APEI generic error status print support

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Date:	Tue, 30 Nov 2010 10:00:47 -0800
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Huang, Ying" <ying.huang@...el.com>
CC:	Len Brown <lenb@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: RE: [PATCH -v2 2/3] ACPI, APEI, Add APEI generic error status print
 support

> +	for (i = 0; i < strs_size; i++) {
> +		if (!(bits & (1U << i)))
> +			continue;
> +		str = strs[i];
> +		if (len && len + strlen(str) + 2 > 80) {
> +			printk("\n");
> +			len = 0;
> +		}
> +		if (!len)
> +			len = pr_pfx(pfx, "%s", str);
> +		else
> +			len += printk(", %s", str);
> +	}
> +	if (len)
> +		printk("\n");

Does printk() offer any guarantees about getting all the characters
from a single printk() call out to the console without interleaving
with messages from printk() calls on other cpus?  If it does, then
it would be a good idea to sprintf() the parts of this message to
a buffer and then use one printk() call.  I think I read that netconsole
ends up with one packet on the wire for each call to printk().

Trying to parse output jumbled together from multiple cpus
doesn't sound like fun.

-Tony
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