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[S390] Poison init section before freeing it.

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The data patterns should allow us to easily tell if somebody accesses
initdata/code after it was freed. Same code as on various other
architectures.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2006-12-08 15:56:13 +01:00 committed by Martin Schwidefsky
parent 39b742f957
commit 028d9b3cc6
1 changed files with 2 additions and 0 deletions
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2
arch/s390/mm/init.c
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@ -24,6 +24,7 @@
#include <linux/pagemap.h> #include <linux/pagemap.h>
#include <linux/bootmem.h> #include <linux/bootmem.h>
#include <linux/pfn.h> #include <linux/pfn.h>
#include <linux/poison.h>
#include <asm/processor.h> #include <asm/processor.h>
#include <asm/system.h> #include <asm/system.h>
@ -187,6 +188,7 @@ void free_initmem(void)
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr)); ClearPageReserved(virt_to_page(addr));
init_page_count(virt_to_page(addr)); init_page_count(virt_to_page(addr));
memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
free_page(addr); free_page(addr);
totalram_pages++; totalram_pages++;
} }