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Commit bb577f98 authored by Hugh Dickins's avatar Hugh Dickins Committed by Ingo Molnar
Browse files

x86: add periodic corruption check 



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: default avatarHugh Dickins <hugh@veritas.com>
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 5394f80f

arch/x86/kernel/setup.c

+17 −0
Original line number Diff line number Diff line
@@ -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;

arch/x86/mm/fault.c

+0 −2
Original line number Diff line number Diff line
@@ -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

arch/x86/mm/init_32.c

+2 −0
Original line number Diff line number Diff line
@@ -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

arch/x86/mm/init_64.c

+2 −0
Original line number Diff line number Diff line
@@ -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 */

include/linux/kernel.h

+1 −0
Original line number Diff line number Diff line
@@ -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)

{