linux-kernel - [PATCH 1/1] drivers/base/cpu: Print kernel arch

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Message-Id: <20220727161135.24531-1-pvorel@suse.cz>
Date:   Wed, 27 Jul 2022 18:11:35 +0200
From:   Petr Vorel <pvorel@...e.cz>
To:     linux-kernel@...r.kernel.org
Cc:     Petr Vorel <pvorel@...e.cz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        David Sterba <dsterba@...e.com>
Subject: [PATCH 1/1] drivers/base/cpu: Print kernel arch

Print kernel architecture in /sys/devices/system/cpu/arch
using UTS_MACHINE, i.e. member of struct uts_namespace.machine.

This helps people who debug kernel with initramfs with minimal
environment (i.e. without coreutils or even busybox) or allow to open
sysfs file instead of run uname -m in high level languages.

Signed-off-by: Petr Vorel <pvorel@...e.cz>
---
 drivers/base/cpu.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 4c98849577d4..7c8032e3ff10 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -3,6 +3,7 @@
  * CPU subsystem support
  */
 
+#include <generated/compile.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -232,6 +233,13 @@ static ssize_t print_cpus_kernel_max(struct device *dev,
 }
 static DEVICE_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL);
 
+static ssize_t print_cpus_arch(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%s\n", UTS_MACHINE);
+}
+static DEVICE_ATTR(arch, 0444, print_cpus_arch, NULL);
+
 /* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */
 unsigned int total_cpus;
 
@@ -464,6 +472,7 @@ static struct attribute *cpu_root_attrs[] = {
 	&cpu_attrs[1].attr.attr,
 	&cpu_attrs[2].attr.attr,
 	&dev_attr_kernel_max.attr,
+	&dev_attr_arch.attr,
 	&dev_attr_offline.attr,
 	&dev_attr_isolated.attr,
 #ifdef CONFIG_NO_HZ_FULL
-- 
2.37.1