linux-kernel - [PATCH 4/5] init: Support negative CPUs boot and halt code

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Message-Id: <1427844036-1325-5-git-send-email-fweisbec@gmail.com>
Date:	Wed,  1 Apr 2015 01:20:35 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH 4/5] init: Support negative CPUs boot and halt code

Only x86 is supported for now.

Not-Yet-Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 arch/x86/kernel/reboot.c | 8 ++++++++
 init/main.c              | 7 +++++++
 2 files changed, 15 insertions(+)

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index bae6c60..d3ae1a3 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -582,8 +582,10 @@ static void native_machine_emergency_restart(void)
 	}
 }
 
+#if CONFIG_NR_CPUS >= 0
 void native_machine_shutdown(void)
 {
+
 	/* Stop the cpus and apics */
 #ifdef CONFIG_X86_IO_APIC
 	/*
@@ -620,6 +622,12 @@ void native_machine_shutdown(void)
 	x86_platform.iommu_shutdown();
 #endif
 }
+#else /* #if CONFIG_NR_CPUS >= 0 */
+void native_machine_shutdown(void)
+{
+	start_kernel();
+}
+#endif
 
 static void __machine_emergency_restart(int emergency)
 {
diff --git a/init/main.c b/init/main.c
index 6f0f1c5f..8933c8f 100644
--- a/init/main.c
+++ b/init/main.c
@@ -486,6 +486,7 @@ static void __init mm_init(void)
 	vmalloc_init();
 }
 
+#if CONFIG_NR_CPUS >= 0
 asmlinkage __visible void __init start_kernel(void)
 {
 	char *command_line;
@@ -673,6 +674,12 @@ asmlinkage __visible void __init start_kernel(void)
 	/* Do the rest non-__init'ed, we're now alive */
 	rest_init();
 }
+#else /* #if CONFIG_NR_CPUS >= 0 */
+asmlinkage __visible void __init start_kernel(void)
+{
+	native_machine_shutdown();
+}
+#endif
 
 /* Call all constructor functions linked into the kernel. */
 static void __init do_ctors(void)
-- 
2.1.4

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