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authorIngo Molnar <mingo@elte.hu>2008-01-30 13:34:03 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:34:03 +0100
commitace63e3743ae59fc0cce48450bd2e410776b4148 (patch)
tree77a1a67a8125ae447d36eff62915fb93dd2c88bc /arch/x86/mm/pageattr_64.c
parentf5a50ce1bf53a07cb7d0bab1a87e62cc4f34f0ab (diff)
x86: add kernel_map_pages() to 64-bit
needed for DEBUG_PAGEALLOC support and for unification. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/mm/pageattr_64.c')
-rw-r--r--arch/x86/mm/pageattr_64.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/x86/mm/pageattr_64.c b/arch/x86/mm/pageattr_64.c
index 4053832d410..e1c860800ff 100644
--- a/arch/x86/mm/pageattr_64.c
+++ b/arch/x86/mm/pageattr_64.c
@@ -260,3 +260,33 @@ void global_flush_tlb(void)
on_each_cpu(flush_kernel_map, NULL, 1, 1);
}
EXPORT_SYMBOL(global_flush_tlb);
+
+#ifdef CONFIG_DEBUG_PAGEALLOC
+void kernel_map_pages(struct page *page, int numpages, int enable)
+{
+ if (PageHighMem(page))
+ return;
+ if (!enable) {
+ debug_check_no_locks_freed(page_address(page),
+ numpages * PAGE_SIZE);
+ }
+
+ /*
+ * If page allocator is not up yet then do not call c_p_a():
+ */
+ if (!debug_pagealloc_enabled)
+ return;
+
+ /*
+ * the return value is ignored - the calls cannot fail,
+ * large pages are disabled at boot time.
+ */
+ change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
+
+ /*
+ * we should perform an IPI and flush all tlbs,
+ * but that can deadlock->flush only current cpu.
+ */
+ __flush_tlb_all();
+}
+#endif