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-rw-r--r--arch/i386/Kconfig41
-rw-r--r--arch/i386/kernel/cpu/common.c2
-rw-r--r--arch/i386/kernel/smpboot.c4
-rw-r--r--arch/i386/kernel/trampoline.S5
4 files changed, 49 insertions, 3 deletions
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 0d67a0a1151..0dfee812811 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -777,6 +777,47 @@ config CRASH_DUMP
PHYSICAL_START.
For more details see Documentation/kdump/kdump.txt
+config PHYSICAL_START
+ hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
+ default "0x100000"
+ help
+ This gives the physical address where the kernel is loaded.
+
+ If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
+ bzImage will decompress itself to above physical address and
+ run from there. Otherwise, bzImage will run from the address where
+ it has been loaded by the boot loader and will ignore above physical
+ address.
+
+ In normal kdump cases one does not have to set/change this option
+ as now bzImage can be compiled as a completely relocatable image
+ (CONFIG_RELOCATABLE=y) and be used to load and run from a different
+ address. This option is mainly useful for the folks who don't want
+ to use a bzImage for capturing the crash dump and want to use a
+ vmlinux instead. vmlinux is not relocatable hence a kernel needs
+ to be specifically compiled to run from a specific memory area
+ (normally a reserved region) and this option comes handy.
+
+ So if you are using bzImage for capturing the crash dump, leave
+ the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
+ Otherwise if you plan to use vmlinux for capturing the crash dump
+ change this value to start of the reserved region (Typically 16MB
+ 0x1000000). In other words, it can be set based on the "X" value as
+ specified in the "crashkernel=YM@XM" command line boot parameter
+ passed to the panic-ed kernel. Typically this parameter is set as
+ crashkernel=64M@16M. Please take a look at
+ Documentation/kdump/kdump.txt for more details about crash dumps.
+
+ Usage of bzImage for capturing the crash dump is recommended as
+ one does not have to build two kernels. Same kernel can be used
+ as production kernel and capture kernel. Above option should have
+ gone away after relocatable bzImage support is introduced. But it
+ is present because there are users out there who continue to use
+ vmlinux for dump capture. This option should go away down the
+ line.
+
+ Don't change this unless you know what you are doing.
+
config RELOCATABLE
bool "Build a relocatable kernel(EXPERIMENTAL)"
depends on EXPERIMENTAL
diff --git a/arch/i386/kernel/cpu/common.c b/arch/i386/kernel/cpu/common.c
index 1b34c56f812..8689d62abd4 100644
--- a/arch/i386/kernel/cpu/common.c
+++ b/arch/i386/kernel/cpu/common.c
@@ -54,7 +54,7 @@ static struct cpu_dev __cpuinitdata default_cpu = {
.c_init = default_init,
.c_vendor = "Unknown",
};
-static struct cpu_dev * this_cpu = &default_cpu;
+static struct cpu_dev * this_cpu __cpuinitdata = &default_cpu;
static int __init cachesize_setup(char *str)
{
diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index aef39be8136..300d9b38d02 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -227,7 +227,7 @@ static struct {
atomic_t count_start;
atomic_t count_stop;
unsigned long long values[NR_CPUS];
-} tsc __initdata = {
+} tsc __cpuinitdata = {
.start_flag = ATOMIC_INIT(0),
.count_start = ATOMIC_INIT(0),
.count_stop = ATOMIC_INIT(0),
@@ -332,7 +332,7 @@ static void __init synchronize_tsc_bp(void)
printk("passed.\n");
}
-static void __init synchronize_tsc_ap(void)
+static void __cpuinit synchronize_tsc_ap(void)
{
int i;
diff --git a/arch/i386/kernel/trampoline.S b/arch/i386/kernel/trampoline.S
index fcce0e61b0e..2f1814c5cfd 100644
--- a/arch/i386/kernel/trampoline.S
+++ b/arch/i386/kernel/trampoline.S
@@ -38,6 +38,11 @@
.data
+/* We can free up trampoline after bootup if cpu hotplug is not supported. */
+#ifndef CONFIG_HOTPLUG_CPU
+.section ".init.data","aw",@progbits
+#endif
+
.code16
ENTRY(trampoline_data)