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Subject[PATCH 2/9] x86 idle: remove NOP cpuinfo_x86.hlt_works_ok flag
Date
From: Len Brown <len.brown@intel.com>

hlt_works_ok was X86_32 only, initialized to 1, and never cleared.

On 32-bit kernels, this deletes a line from /proc/cpuinfo: "hlt_bug : no"

Signed-off-by: Len Brown <len.brown@intel.com>
---
arch/x86/include/asm/processor.h | 5 -----
arch/x86/kernel/cpu/bugs.c | 5 +----
arch/x86/kernel/cpu/proc.c | 2 --
arch/x86/kernel/process.c | 2 +-
arch/x86/kernel/setup.c | 4 ++--
arch/x86/xen/setup.c | 3 ---
6 files changed, 4 insertions(+), 17 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 45636ce..b5c83f1 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -67,7 +67,6 @@ struct cpuinfo_x86 {
char wp_works_ok; /* It doesn't on 386's */

/* Problems on some 486Dx4's and old 386's: */
- char hlt_works_ok;
char hard_math;
char rfu;
char fdiv_bug;
@@ -150,11 +149,7 @@ extern const struct seq_operations cpuinfo_op;

static inline int hlt_works(int cpu)
{
-#ifdef CONFIG_X86_32
- return cpu_data(cpu).hlt_works_ok;
-#else
return 1;
-#endif
}

#define cache_line_size() (boot_cpu_data.x86_cache_alignment)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 4c91631..b5e2910 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -82,10 +82,7 @@ static void __init check_hlt(void)
return;

printk(KERN_INFO "Checking 'hlt' instruction... ");
- if (!boot_cpu_data.hlt_works_ok) {
- printk("disabled\n");
- return;
- }
+
halt();
halt();
halt();
diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c
index 62ac8cb..203feb7 100644
--- a/arch/x86/kernel/cpu/proc.c
+++ b/arch/x86/kernel/cpu/proc.c
@@ -33,7 +33,6 @@ static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
int fpu_exception = c->hard_math && (ignore_fpu_irq || cpu_has_fpu);
seq_printf(m,
"fdiv_bug\t: %s\n"
- "hlt_bug\t\t: %s\n"
"f00f_bug\t: %s\n"
"coma_bug\t: %s\n"
"fpu\t\t: %s\n"
@@ -41,7 +40,6 @@ static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
"cpuid level\t: %d\n"
"wp\t\t: %s\n",
c->fdiv_bug ? "yes" : "no",
- c->hlt_works_ok ? "no" : "yes",
c->f00f_bug ? "yes" : "no",
c->coma_bug ? "yes" : "no",
c->hard_math ? "yes" : "no",
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index ff45541..4966c7e 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -362,7 +362,7 @@ EXPORT_SYMBOL(enable_hlt);

static inline int hlt_use_halt(void)
{
- return (!hlt_counter && boot_cpu_data.hlt_works_ok);
+ return (!hlt_counter);
}
#else
static inline int hlt_use_halt(void)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index d3cfe26..fab5631 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -175,9 +175,9 @@ static struct resource bss_resource = {

#ifdef CONFIG_X86_32
/* cpu data as detected by the assembly code in head.S */
-struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
+struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 0, 0, -1};
/* common cpu data for all cpus */
-struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
+struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 0, 0, -1};
EXPORT_SYMBOL(boot_cpu_data);
static void set_mca_bus(int x)
{
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index a8a66a5..97d2fbd 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -351,9 +351,6 @@ void __init xen_arch_setup(void)
COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);

/* Set up idle, making sure it calls safe_halt() pvop */
-#ifdef CONFIG_X86_32
- boot_cpu_data.hlt_works_ok = 1;
-#endif
pm_idle = default_idle;
boot_option_idle_override = IDLE_HALT;

--
1.7.4.2.406.gbe91


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