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Commit 81a3de3e authored by Helge Deller's avatar Helge Deller Committed by Kyle McMartin
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[PARISC] Use DEBUG_KERNEL to catch used-after-free __init data 



Use CONFIG_DEBUG_KERNEL to catch kernel code which tries to access
__init data after it is freed. When CONFIG_DEBUG_KERNEL is not set
this also cleans up a WARN_ON at boot time. Also remove some dead
code from mm/init.c

Signed-off-by: default avatarHelge Deller <deller@parisc-linux.org>
Signed-off-by: default avatarKyle McMartin <kyle@parisc-linux.org>
parent 1bcdd854

arch/parisc/mm/init.c

+1 −8
Original line number Diff line number Diff line
@@ -371,17 +371,11 @@ static void __init setup_bootmem(void) 


void free_initmem(void)

{

	/* FIXME: */

#if 0

	printk(KERN_INFO "NOT FREEING INITMEM (%dk)\n",

			(&__init_end - &__init_begin) >> 10);

	return;

#else

	unsigned long addr;

	

	printk(KERN_INFO "Freeing unused kernel memory: ");



#if 1

#ifdef CONFIG_DEBUG_KERNEL

	/* Attempt to catch anyone trying to execute code here

	 * by filling the page with BRK insns.

	 *
@@ -414,7 +408,6 @@ void free_initmem(void) 
	pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);

	

	printk("%luk freed\n", (unsigned long)(&__init_end - &__init_begin) >> 10);

#endif

}