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authorHeiko Carstens <heiko.carstens@de.ibm.com>2008-02-05 16:50:37 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-02-05 16:50:54 +0100
commit2485579bf5d3ea30d39b251defa1620ad77168bd (patch)
treeef07e9e793f7f73d69b21c539ad96d5346787182 /arch/s390/mm/init.c
parent01bc8ad165490458a8feb744c8f401c1a7098e3a (diff)
downloadlinux-linaro-stable-2485579bf5d3ea30d39b251defa1620ad77168bd.tar.gz
[S390] DEBUG_PAGEALLOC support for s390.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/init.c')
-rw-r--r--arch/s390/mm/init.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index b234bb4a6da7..983ec6ec0e7c 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -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;