linux-kernel - [RFC 06/18] init: Add liveupdate cmdline param

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Message-ID: <20240205120203.60312-7-jgowans@amazon.com>
Date: Mon, 5 Feb 2024 12:01:51 +0000
From: James Gowans <jgowans@...zon.com>
To: <linux-kernel@...r.kernel.org>
CC: Eric Biederman <ebiederm@...ssion.com>, <kexec@...ts.infradead.org>,
	"Joerg Roedel" <joro@...tes.org>, Will Deacon <will@...nel.org>,
	<iommu@...ts.linux.dev>, Alexander Viro <viro@...iv.linux.org.uk>, "Christian
 Brauner" <brauner@...nel.org>, <linux-fsdevel@...r.kernel.org>, Paolo Bonzini
	<pbonzini@...hat.com>, Sean Christopherson <seanjc@...gle.com>,
	<kvm@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>,
	<linux-mm@...ck.org>, Alexander Graf <graf@...zon.com>, David Woodhouse
	<dwmw@...zon.co.uk>, "Jan H . Schoenherr" <jschoenh@...zon.de>, Usama Arif
	<usama.arif@...edance.com>, Anthony Yznaga <anthony.yznaga@...cle.com>,
	Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>,
	<madvenka@...ux.microsoft.com>, <steven.sistare@...cle.com>,
	<yuleixzhang@...cent.com>
Subject: [RFC 06/18] init: Add liveupdate cmdline param

This will allow other subsystems to know when we're going a LU and hence
when they should be restoring rather than reinitialising state.
---
 include/linux/init.h |  1 +
 init/main.c          | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/include/linux/init.h b/include/linux/init.h
index 266c3e1640d4..d7c68c7bfaf0 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -146,6 +146,7 @@ extern int do_one_initcall(initcall_t fn);
 extern char __initdata boot_command_line[];
 extern char *saved_command_line;
 extern unsigned int saved_command_line_len;
+extern bool liveupdate;
 extern unsigned int reset_devices;
 
 /* used by init/main.c */
diff --git a/init/main.c b/init/main.c
index e24b0780fdff..7807a56c3473 100644
--- a/init/main.c
+++ b/init/main.c
@@ -165,6 +165,16 @@ static char *ramdisk_execute_command = "/init";
 bool static_key_initialized __read_mostly;
 EXPORT_SYMBOL_GPL(static_key_initialized);
 
+bool liveupdate __read_mostly;
+EXPORT_SYMBOL(liveupdate);
+
+static int __init set_liveupdate(char *param)
+{
+	liveupdate = true;
+	return 0;
+}
+early_param("liveupdate", set_liveupdate);
+
 /*
  * If set, this is an indication to the drivers that reset the underlying
  * device before going ahead with the initialization otherwise driver might
-- 
2.40.1