linux-kernel - [PATCH v1 01/12] x86/smp: Make start_secondary() and initial_pg

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Date:	Fri, 22 Jan 2016 16:35:47 -0500
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	david.vrabel@...rix.com, konrad.wilk@...cle.com
Cc:	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
	roger.pau@...rix.com, mcgrof@...e.com,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: [PATCH v1 01/12] x86/smp: Make start_secondary() and initial_pg_pmd visible globally

Xen's HVMlite guests will want to use them.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
---
 arch/x86/include/asm/smp.h |    1 +
 arch/x86/kernel/head_32.S  |    2 +-
 arch/x86/kernel/smpboot.c  |    2 +-
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index dfcf072..739abb0 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -147,6 +147,7 @@ void x86_idle_thread_init(unsigned int cpu, struct task_struct *idle);
 
 void smp_store_boot_cpu_info(void);
 void smp_store_cpu_info(int id);
+void start_secondary(void *unused);
 #define cpu_physical_id(cpu)	per_cpu(x86_cpu_to_apicid, cpu)
 
 #else /* !CONFIG_SMP */
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 6bc9ae2..eeb5c42 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -666,7 +666,7 @@ ENTRY(setup_once_ref)
 __PAGE_ALIGNED_BSS
 	.align PAGE_SIZE
 #ifdef CONFIG_X86_PAE
-initial_pg_pmd:
+ENTRY(initial_pg_pmd)
 	.fill 1024*KPMDS,4,0
 #else
 ENTRY(initial_page_table)
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 24d57f7..cba00bc 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -199,7 +199,7 @@ static int enable_start_cpu0;
 /*
  * Activate a secondary processor.
  */
-static void notrace start_secondary(void *unused)
+void notrace start_secondary(void *unused)
 {
 	/*
 	 * Don't put *anything* before cpu_init(), SMP booting is too
-- 
1.7.1