From bfca3dd3d0680fc2fc7f659a152234afbac26e4d Mon Sep 17 00:00:00 2001
From: Petr Vorel <pvorel@suse.cz>
Date: Thu, 1 Sep 2022 21:44:03 +0200
Subject: [PATCH] kernel/utsname_sysctl.c: print kernel arch
Print the machine hardware name (UTS_MACHINE) in /proc/sys/kernel/arch.
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.
Link: https://lkml.kernel.org/r/20220901194403.3819-1-pvorel@suse.cz
Signed-off-by: Petr Vorel <pvorel@suse.cz>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: David Sterba <dsterba@suse.com>
Cc: "Eric W . Biederman" <ebiederm@xmission.com>
Cc: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
Documentation/admin-guide/sysctl/kernel.rst | 5 +++++
kernel/utsname_sysctl.c | 7 +++++++
2 files changed, 12 insertions(+)
diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst
index ee6572b1edada..bbaa851946956 100644
--- a/Documentation/admin-guide/sysctl/kernel.rst
+++ b/Documentation/admin-guide/sysctl/kernel.rst
@@ -65,6 +65,11 @@ combining the following values:
4 s3_beep
= =======
+arch
+====
+
+The machine hardware name, the same output as ``uname -m``
+(e.g. ``x86_64`` or ``aarch64``).
auto_msgmni
===========
diff --git a/kernel/utsname_sysctl.c b/kernel/utsname_sysctl.c
index 4ca61d49885b6..7ffdd2cd5ff9b 100644
--- a/kernel/utsname_sysctl.c
+++ b/kernel/utsname_sysctl.c
@@ -73,6 +73,13 @@ static DEFINE_CTL_TABLE_POLL(hostname_poll);
static DEFINE_CTL_TABLE_POLL(domainname_poll);
static struct ctl_table uts_kern_table[] = {
+ {
+ .procname = "arch",
+ .data = init_uts_ns.name.machine,
+ .maxlen = sizeof(init_uts_ns.name.machine),
+ .mode = 0444,
+ .proc_handler = proc_do_uts_string,
+ },
{
.procname = "ostype",
.data = init_uts_ns.name.sysname,
--
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