Commit 2485579b authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

[S390] DEBUG_PAGEALLOC support for s390.


Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 01bc8ad1
......@@ -6,4 +6,12 @@ config TRACE_IRQFLAGS_SUPPORT
source "lib/Kconfig.debug"
config DEBUG_PAGEALLOC
bool "Debug page memory allocations"
depends on DEBUG_KERNEL
help
Unmap pages from the kernel linear mapping after free_pages().
This results in a slowdown, but helps to find certain types of
memory corruptions.
endmenu
......@@ -271,7 +271,10 @@ void die(const char * str, struct pt_regs * regs, long err)
printk("PREEMPT ");
#endif
#ifdef CONFIG_SMP
printk("SMP");
printk("SMP ");
#endif
#ifdef CONFIG_DEBUG_PAGEALLOC
printk("DEBUG_PAGEALLOC");
#endif
printk("\n");
notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
......
......@@ -167,6 +167,33 @@ void __init mem_init(void)
PFN_ALIGN((unsigned long)&_eshared) - 1);
}
#ifdef CONFIG_DEBUG_PAGEALLOC
void kernel_map_pages(struct page *page, int numpages, int enable)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
unsigned long address;
int i;
for (i = 0; i < numpages; i++) {
address = page_to_phys(page + i);
pgd = pgd_offset_k(address);
pud = pud_offset(pgd, address);
pmd = pmd_offset(pud, address);
pte = pte_offset_kernel(pmd, address);
if (!enable) {
ptep_invalidate(address, pte);
continue;
}
*pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
/* Flush cpu write queue. */
mb();
}
}
#endif
void free_initmem(void)
{
unsigned long addr;
......
......@@ -24,4 +24,8 @@
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
memcpy(dst, src, len)
#ifdef CONFIG_DEBUG_PAGEALLOC
void kernel_map_pages(struct page *page, int numpages, int enable);
#endif
#endif /* _S390_CACHEFLUSH_H */
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