The patch titled
i386: paravirt: cpu_detect extraction
has been added to the -mm tree. Its filename is
paravirt-cpu-detect.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: i386: paravirt: cpu_detect extraction
From: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Both lhype and Xen want to call the core of the x86 cpu detect code before
calling start_kernel.
(extracted from larger patch)
Signed-off-by: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxx>
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/cpu/common.c | 37 ++++++++++++++++++--------------
include/asm-i386/processor.h | 3 ++
include/linux/start_kernel.h | 12 ++++++++++
init/main.c | 1
4 files changed, 37 insertions(+), 16 deletions(-)
diff -puN arch/i386/kernel/cpu/common.c~paravirt-cpu-detect arch/i386/kernel/cpu/common.c
--- a/arch/i386/kernel/cpu/common.c~paravirt-cpu-detect
+++ a/arch/i386/kernel/cpu/common.c
@@ -236,29 +236,14 @@ static int __cpuinit have_cpuid_p(void)
return flag_is_changeable_p(X86_EFLAGS_ID);
}
-/* Do minimum CPU detection early.
- Fields really needed: vendor, cpuid_level, family, model, mask, cache alignment.
- The others are not touched to avoid unwanted side effects.
-
- WARNING: this function is only called on the BP. Don't add code here
- that is supposed to run on all CPUs. */
-static void __init early_cpu_detect(void)
+void __init cpu_detect(struct cpuinfo_x86 *c)
{
- struct cpuinfo_x86 *c = &boot_cpu_data;
-
- c->x86_cache_alignment = 32;
-
- if (!have_cpuid_p())
- return;
-
/* Get vendor name */
cpuid(0x00000000, &c->cpuid_level,
(int *)&c->x86_vendor_id[0],
(int *)&c->x86_vendor_id[8],
(int *)&c->x86_vendor_id[4]);
- get_cpu_vendor(c, 1);
-
c->x86 = 4;
if (c->cpuid_level >= 0x00000001) {
u32 junk, tfms, cap0, misc;
@@ -275,6 +260,26 @@ static void __init early_cpu_detect(void
}
}
+/* Do minimum CPU detection early.
+ Fields really needed: vendor, cpuid_level, family, model, mask, cache alignment.
+ The others are not touched to avoid unwanted side effects.
+
+ WARNING: this function is only called on the BP. Don't add code here
+ that is supposed to run on all CPUs. */
+static void __init early_cpu_detect(void)
+{
+ struct cpuinfo_x86 *c = &boot_cpu_data;
+
+ c->x86_cache_alignment = 32;
+
+ if (!have_cpuid_p())
+ return;
+
+ cpu_detect(c);
+
+ get_cpu_vendor(c, 1);
+}
+
static void __cpuinit generic_identify(struct cpuinfo_x86 * c)
{
u32 tfms, xlvl;
diff -puN include/asm-i386/processor.h~paravirt-cpu-detect include/asm-i386/processor.h
--- a/include/asm-i386/processor.h~paravirt-cpu-detect
+++ a/include/asm-i386/processor.h
@@ -20,6 +20,7 @@
#include <linux/threads.h>
#include <asm/percpu.h>
#include <linux/cpumask.h>
+#include <linux/init.h>
/* flag for disabling the tsc */
extern int tsc_disable;
@@ -112,6 +113,8 @@ extern struct cpuinfo_x86 cpu_data[];
extern int cpu_llc_id[NR_CPUS];
extern char ignore_fpu_irq;
+void __init cpu_detect(struct cpuinfo_x86 *c);
+
extern void identify_cpu(struct cpuinfo_x86 *);
extern void print_cpu_info(struct cpuinfo_x86 *);
extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
diff -puN /dev/null include/linux/start_kernel.h
--- /dev/null
+++ a/include/linux/start_kernel.h
@@ -0,0 +1,12 @@
+#ifndef _LINUX_START_KERNEL_H
+#define _LINUX_START_KERNEL_H
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+
+/* Define the prototype for start_kernel here, rather than cluttering
+ up something else. */
+
+extern asmlinkage void __init start_kernel(void);
+
+#endif /* _LINUX_START_KERNEL_H */
diff -puN init/main.c~paravirt-cpu-detect init/main.c
--- a/init/main.c~paravirt-cpu-detect
+++ a/init/main.c
@@ -29,6 +29,7 @@
#include <linux/percpu.h>
#include <linux/kmod.h>
#include <linux/kernel_stat.h>
+#include <linux/start_kernel.h>
#include <linux/security.h>
#include <linux/workqueue.h>
#include <linux/profile.h>
_
Patches currently in -mm which might be from rusty@xxxxxxxxxxxxxxx are
paravirt-cpu-detect.patch
fix-kunmap_atomics-use-of-kpte_clear_flush.patch
generic-bug-implementation.patch
generic-bug-for-i386.patch
generic-bug-for-x86-64.patch
bug-test-1.patch
-
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