linux-kernel - [PATCH 3/3] x86: cleanup not needed cpu_initialized

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Date:	Thu, 13 Mar 2014 15:25:20 +0100
From:	Igor Mammedov <imammedo@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	imammedo@...hat.com, bp@...e.de, paul.gortmaker@...driver.com,
	JBeulich@...e.com, prarit@...hat.com, drjones@...hat.com,
	toshi.kani@...com, x86@...nel.org, riel@...hat.com,
	gong.chen@...ux.intel.com
Subject: [PATCH 3/3] x86: cleanup not needed cpu_initialized_mask

cpu_initialized_mask is used in cpu_init() for detecting
if AP has been already started. But now test could never
return true since master CPU doesn't give up waiting on
AP startup and native_cpu_up() checks for:

 physid_isset(apicid, phys_cpu_present_map) &&
 cpu_callin_mask

so that it would not attempt to call do_boot_cpu() on
already started AP.
And since cpu_initialized_mask isn't used for anything
else just remove it altogether.

Signed-off-by: Igor Mammedov <imammedo@...hat.com>
---
 arch/x86/include/asm/cpumask.h |    1 -
 arch/x86/kernel/cpu/common.c   |   11 -----------
 arch/x86/kernel/smpboot.c      |    2 --
 3 files changed, 0 insertions(+), 14 deletions(-)

diff --git a/arch/x86/include/asm/cpumask.h b/arch/x86/include/asm/cpumask.h
index 61c852f..c64c5f5 100644
--- a/arch/x86/include/asm/cpumask.h
+++ b/arch/x86/include/asm/cpumask.h
@@ -5,7 +5,6 @@
 
 extern cpumask_var_t cpu_callin_mask;
 extern cpumask_var_t cpu_callout_mask;
-extern cpumask_var_t cpu_initialized_mask;
 extern cpumask_var_t cpu_sibling_setup_mask;
 
 extern void setup_cpu_local_masks(void);
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 9f07b8e..d1382f9 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -47,7 +47,6 @@
 #include "cpu.h"
 
 /* all of these masks are initialized in setup_cpu_local_masks() */
-cpumask_var_t cpu_initialized_mask;
 cpumask_var_t cpu_callout_mask;
 cpumask_var_t cpu_callin_mask;
 
@@ -57,7 +56,6 @@ cpumask_var_t cpu_sibling_setup_mask;
 /* correctly size the local cpu masks */
 void __init setup_cpu_local_masks(void)
 {
-	alloc_bootmem_cpumask_var(&cpu_initialized_mask);
 	alloc_bootmem_cpumask_var(&cpu_callin_mask);
 	alloc_bootmem_cpumask_var(&cpu_callout_mask);
 	alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask);
@@ -1265,9 +1263,6 @@ void cpu_init(void)
 
 	me = current;
 
-	if (cpumask_test_and_set_cpu(cpu, cpu_initialized_mask))
-		panic("CPU#%d already initialized!\n", cpu);
-
 	pr_debug("Initializing CPU#%d\n", cpu);
 
 	clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE);
@@ -1357,12 +1352,6 @@ void cpu_init(void)
 
 	show_ucode_info_early();
 
-	if (cpumask_test_and_set_cpu(cpu, cpu_initialized_mask)) {
-		printk(KERN_WARNING "CPU#%d already initialized!\n", cpu);
-		for (;;)
-			local_irq_enable();
-	}
-
 	printk(KERN_INFO "Initializing CPU#%d\n", cpu);
 
 	if (cpu_has_vme || cpu_has_tsc || cpu_has_de)
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 8bf67bd..803f658 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1237,8 +1237,6 @@ static void __ref remove_cpu_from_maps(int cpu)
 	set_cpu_online(cpu, false);
 	cpumask_clear_cpu(cpu, cpu_callout_mask);
 	cpumask_clear_cpu(cpu, cpu_callin_mask);
-	/* was set by cpu_init() */
-	cpumask_clear_cpu(cpu, cpu_initialized_mask);
 	numa_remove_cpu(cpu);
 }
 
-- 
1.7.1

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