linux-kernel - Re: [PATCH v3] x86: move cacheinfo sysfs to generic cacheinfo infrastructure

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Date:	Thu, 5 Mar 2015 09:16:40 +0100
From:	Borislav Petkov <bp@...e.de>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andre Przywara <andre.przywara@....com>, x86@...nel.org
Subject: Re: [PATCH v3] x86: move cacheinfo sysfs to generic cacheinfo
 infrastructure

On Wed, Mar 04, 2015 at 01:27:20PM +0100, Borislav Petkov wrote:
> Applied, thanks guys.

Ok, we forgot to add the same check in the cpu_has_topoext case in
__cache_amd_cpumap_setup() and my F15h exploded this morning:

---
diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
index 54e43d58e714..8008bc2dd2d0 100644
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -820,9 +820,13 @@ static int __cache_amd_cpumap_setup(unsigned int cpu, int index,
 
 		for_each_online_cpu(i) {
 			this_cpu_ci = get_cpu_cacheinfo(i);
+			if (!this_cpu_ci->info_list)
+				continue;
+
 			apicid = cpu_data(i).apicid;
 			if ((apicid < first) || (apicid > last))
 				continue;
+
 			this_leaf = this_cpu_ci->info_list + index;
 
 			for_each_online_cpu(sibling) {
---

I've folded the above into your patch.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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