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Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, geode: add a VSA2 ID for General Software
  x86: use BOOTMEM_EXCLUSIVE on 32-bit
  x86, 32-bit: fix boot failure on TSC-less processors
  x86: fix NULL pointer deref in __switch_to
  x86: set PAE PHYSICAL_MASK_SHIFT to 44 bits.
This commit is contained in:
Linus Torvalds 2008-06-20 12:36:38 -07:00
commit b1ae8d3a00
7 changed files with 26 additions and 16 deletions
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5
arch/x86/kernel/geode_32.c
View File

@ -166,6 +166,8 @@ int geode_has_vsa2(void)
static int has_vsa2 = -1;
if (has_vsa2 == -1) {
u16 val;
/*
* The VSA has virtual registers that we can query for a
* signature.
@ -173,7 +175,8 @@ int geode_has_vsa2(void)
outw(VSA_VR_UNLOCK, VSA_VRC_INDEX);
outw(VSA_VR_SIGNATURE, VSA_VRC_INDEX);
has_vsa2 = (inw(VSA_VRC_DATA) == VSA_SIG);
val = inw(VSA_VRC_DATA);
has_vsa2 = (val == AMD_VSA_SIG || val == GSW_VSA_SIG);
}
return has_vsa2;

1
arch/x86/kernel/process_32.c
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@ -333,6 +333,7 @@ void flush_thread(void)
/*
* Forget coprocessor state..
*/
tsk->fpu_counter = 0;
clear_fpu(tsk);
clear_used_math();
}

1
arch/x86/kernel/process_64.c
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@ -294,6 +294,7 @@ void flush_thread(void)
/*
* Forget coprocessor state..
*/
tsk->fpu_counter = 0;
clear_fpu(tsk);
clear_used_math();
}

10
arch/x86/kernel/setup_32.c
View File

@ -532,10 +532,16 @@ static void __init reserve_crashkernel(void)
(unsigned long)(crash_size >> 20),
(unsigned long)(crash_base >> 20),
(unsigned long)(total_mem >> 20));
if (reserve_bootmem(crash_base, crash_size,
BOOTMEM_EXCLUSIVE) < 0) {
printk(KERN_INFO "crashkernel reservation "
"failed - memory is in use\n");
return;
}
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
reserve_bootmem(crash_base, crash_size,
BOOTMEM_DEFAULT);
} else
printk(KERN_INFO "crashkernel reservation failed - "
"you have to specify a base address\n");

18
arch/x86/kernel/tsc_32.c
View File

@ -14,7 +14,10 @@
#include "mach_timer.h"
static int tsc_disabled;
/* native_sched_clock() is called before tsc_init(), so
we must start with the TSC soft disabled to prevent
erroneous rdtsc usage on !cpu_has_tsc processors */
static int tsc_disabled = -1;
/*
* On some systems the TSC frequency does not
@ -402,25 +405,20 @@ void __init tsc_init(void)
{
int cpu;
if (!cpu_has_tsc || tsc_disabled) {
/* Disable the TSC in case of !cpu_has_tsc */
tsc_disabled = 1;
if (!cpu_has_tsc || tsc_disabled > 0)
return;
}
cpu_khz = calculate_cpu_khz();
tsc_khz = cpu_khz;
if (!cpu_khz) {
mark_tsc_unstable("could not calculate TSC khz");
/*
* We need to disable the TSC completely in this case
* to prevent sched_clock() from using it.
*/
tsc_disabled = 1;
return;
}
/* now allow native_sched_clock() to use rdtsc */
tsc_disabled = 0;
printk("Detected %lu.%03lu MHz processor.\n",
(unsigned long)cpu_khz / 1000,
(unsigned long)cpu_khz % 1000);

4
include/asm-x86/geode.h
View File

@ -112,8 +112,8 @@ extern int geode_get_dev_base(unsigned int dev);
#define VSA_VR_UNLOCK 0xFC53 /* unlock virtual register */
#define VSA_VR_SIGNATURE 0x0003
#define VSA_VR_MEM_SIZE 0x0200
#define VSA_SIG 0x4132 /* signature is ascii 'VSA2' */
#define AMD_VSA_SIG 0x4132 /* signature is ascii 'VSA2' */
#define GSW_VSA_SIG 0x534d /* General Software signature */
/* GPIO */
#define GPIO_OUTPUT_VAL 0x00

3
include/asm-x86/page_32.h
View File

@ -14,7 +14,8 @@
#define __PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
#ifdef CONFIG_X86_PAE
#define __PHYSICAL_MASK_SHIFT 36
/* 44=32+12, the limit we can fit into an unsigned long pfn */
#define __PHYSICAL_MASK_SHIFT 44
#define __VIRTUAL_MASK_SHIFT 32
#define PAGETABLE_LEVELS 3