On Fri, Feb 10, 2017 at 8:28 AM, Greg KH [off-list ref] wrote:

On Thu, Feb 09, 2017 at 09:25:22AM +0000, Juri Lelli wrote:

quoted

arm and arm64 share lot of code relative to parsing CPU capacity
information from DT, using that information for appropriate scaling and
exposing a sysfs interface for chaging such values at runtime.

Factorize such code in a common place (driver/base/arch_topology.c) in
preparation for further additions.

Suggested-by: Will Deacon <redacted>
Suggested-by: Mark Rutland <redacted>
Suggested-by: Catalin Marinas <redacted>
Cc: Russell King <redacted>
Cc: Catalin Marinas <redacted>
Cc: Will Deacon <redacted>
Cc: Greg Kroah-Hartman <redacted>
Signed-off-by: Juri Lelli <redacted>
---

Changes from v1:
 - keep the original GPLv2 header
---
 arch/arm/Kconfig             |   1 +
 arch/arm/kernel/topology.c   | 213 ++------------------------------------
 arch/arm64/Kconfig           |   1 +
 arch/arm64/kernel/topology.c | 219 +--------------------------------------
 drivers/base/Kconfig         |   8 ++
 drivers/base/Makefile        |   1 +
 drivers/base/arch_topology.c | 237 +++++++++++++++++++++++++++++++++++++++++++
 7 files changed, 257 insertions(+), 423 deletions(-)
 create mode 100644 drivers/base/arch_topology.c

Ah, so you want _me_ to maintain this, ok, I better review it...

quoted

--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig

@@ -339,4 +339,12 @@ config CMA_ALIGNMENT

 endif

+config GENERIC_ARCH_TOPOLOGY
+     bool
+     help
+       Enable support for architectures common topology code: e.g., parsing
+       CPU capacity information from DT, usage of such information for
+       appropriate scaling, sysfs interface for changing capacity values at
+          runtime.

Mix of spaces and tabs :(

quoted

+
 endmenu

diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index f2816f6ff76a..397e5c344e6a 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile

@@ -23,6 +23,7 @@ obj-$(CONFIG_SOC_BUS) += soc.o
 obj-$(CONFIG_PINCTRL) += pinctrl.o
 obj-$(CONFIG_DEV_COREDUMP) += devcoredump.o
 obj-$(CONFIG_GENERIC_MSI_IRQ_DOMAIN) += platform-msi.o
+obj-$(CONFIG_GENERIC_ARCH_TOPOLOGY) += arch_topology.o

 obj-y                        += test/

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
new file mode 100644
index 000000000000..c1dd430adad2
--- /dev/null
+++ b/drivers/base/arch_topology.c

@@ -0,0 +1,237 @@
+/*
+ * driver/base/arch_topology.c - Arch specific cpu topology information

No need to keep the filename in the file, you know what it is called :)

quoted

+ *
+ * Copyright (C) 2016, ARM Ltd.
+ * Written by: Juri Lelli, ARM Ltd.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.

So, v2 only?  Please be specific.  Even better yet, use a SPDX header if
you want to, those are always nice.

Sorry to hijack this thread, but you're recommending SPDX now? You
seemed pretty negative on it last time it came up[1]. Or was that just
in context of the churn of converting existing files? Personally, I
like the use of SPDX tags over free form license text and would like
to encourage it for dts files.

Rob

[1] https://lkml.org/lkml/2015/2/5/65
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