Re: [PATCH 1/1] powerpc: fix missing L2 cache size in /sys/devices/system/cpu

Michael Ellerman [off-list ref] wrote:

On Mon, 2015-02-09 at 14:14 -0800, Dave Olson wrote:

quoted

From: Dave Olson <redacted>

Fix missing L2 cache size in /sys/devices/system/cpu/cpu0/cache/index2/size
This bug appears to be introduced in 2.6.29 by 93197a36a9c16a85fb24cf5a8639f7bf9af838a3.
The missing entry caused lscpu to error out on e500v2 devices, and probably others
 error: cannot open /sys/devices/system/cpu/cpu0/cache/index2/size: No such file or directory
The DTS files we see use cache-size for the unified L2 cache size, not d-cache-size

Can you convince me that this is not going to break other machines that have
"d-cache-size" but not "cache-size"?

I'm unable to find any dts file that uses d-cache-size for the L2
unified cache.  All in the powerpc tree in arch/powerpc/boot/dts/*
are using cache-size in the L2 description for the cache size.

As best as I can tell from looking around, this is universal.

Dave Olson
olson@cumulusnetworks.com