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x86: add periodic corruption check

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Perodically check for corruption in low phusical memory.  Don't bother
checking at fault time, since it won't show anything useful.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Hugh Dickins 2008-09-07 01:51:33 -07:00 committed by Ingo Molnar
parent 5394f80f92
commit bb577f980e
5 changed files with 22 additions and 2 deletions
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17
arch/x86/kernel/setup.c
View file

@ -623,6 +623,7 @@ static void __init setup_bios_corruption_check(void)
}
static int __read_mostly bios_corruption_check = 1;
static struct timer_list periodic_check_timer;
void check_for_bios_corruption(void)
{
@ -650,6 +651,22 @@ void check_for_bios_corruption(void)
dump_stack();
}
static void periodic_check_for_corruption(unsigned long data)
{
check_for_bios_corruption();
mod_timer(&periodic_check_timer, jiffies + 60*HZ);
}
void start_periodic_check_for_corruption(void)
{
if (!bios_corruption_check)
return;
init_timer(&periodic_check_timer);
periodic_check_timer.function = &periodic_check_for_corruption;
periodic_check_for_corruption(0);
}
static int set_bios_corruption_check(char *arg)
{
char *end;

2
arch/x86/mm/fault.c
View file

@ -848,8 +848,6 @@ void __kprobes do_page_fault(struct pt_regs *regs, unsigned long error_code)
* Oops. The kernel tried to access some bad page. We'll have to
* terminate things with extreme prejudice.
*/
check_for_bios_corruption();
#ifdef CONFIG_X86_32
bust_spinlocks(1);
#else

2
arch/x86/mm/init_32.c
View file

@ -907,6 +907,8 @@ void __init mem_init(void)
int codesize, reservedpages, datasize, initsize;
int tmp;
start_periodic_check_for_corruption();
#ifdef CONFIG_FLATMEM
BUG_ON(!mem_map);
#endif

2
arch/x86/mm/init_64.c
View file

@ -769,6 +769,8 @@ void __init mem_init(void)
{
long codesize, reservedpages, datasize, initsize;
start_periodic_check_for_corruption();
pci_iommu_alloc();
/* clear_bss() already clear the empty_zero_page */

1
include/linux/kernel.h
View file

@ -246,6 +246,7 @@ extern int root_mountflags;
* able to scatter it around anywhere in the kernel.
*/
void check_for_bios_corruption(void);
void start_periodic_check_for_corruption(void);
#else
static inline void check_for_bios_corruption(void)
{