linux-kernel - Re: 2.6.32-rc8: amd64

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Date:	Mon, 30 Nov 2009 21:35:47 +0100
From:	Borislav Petkov <petkovbb@...glemail.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Doug Thompson <dougthompson@...ssion.com>,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: 2.6.32-rc8: amd64_edac slub error

Hi Randy,

On Mon, Nov 30, 2009 at 09:28:19AM -0800, Randy Dunlap wrote:
> Loading amd64_edac_mod on an amd64 system without the expected hardware support
> causes memory usage error(s).

Well, this is new!

> Is this already fixed/patched?  Do you need more info?

Nope :(.

I've tried to reproduce it here by selecting CONFIG_SLUB no success.
Please send me your config.

Also, it would be very helpful if you could enable CONFIG_EDAC_DEBUG and
run it again.

>From looking at the error trace, though, it looks like we're
not allocating enough memory for the struct msr things in
amd64_nb_mce_bank_enabled_on_node(). This is just a hunch though and you
could give the following debug patch a try:

---
diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index a38831c..139bc14 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -2739,8 +2739,10 @@ static void get_cpus_on_this_dct_cpumask(cpumask_t *mask, int nid)
 	int cpu;
 
 	for_each_online_cpu(cpu)
-		if (amd_get_nb_id(cpu) == nid)
+		if (amd_get_nb_id(cpu) == nid) {
+			pr_err("%s: nid: %d, cpu: %d\n", __func__, nid, cpu);
 			cpumask_set_cpu(cpu, mask);
+		}
 }
 
 /* check MCG_CTL on all the cpus on this node */
@@ -2755,6 +2757,8 @@ static bool amd64_nb_mce_bank_enabled_on_node(int nid)
 
 	get_cpus_on_this_dct_cpumask(&mask, nid);
 
+	pr_err("%s: weight: %d\n", __func__, cpumask_weight(&mask));
+
 	msrs = kzalloc(sizeof(struct msr) * cpumask_weight(&mask), GFP_KERNEL);
 	if (!msrs) {
 		amd64_printk(KERN_WARNING, "%s: error allocating msrs\n",

--

PS. I'm travelling till the end of the week and won't have constant
access to mail but I'll do my best to fix this, sorry.

Thanks.

-- 
Regards/Gruss,
    Boris.
--
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