x86: implement true end_pfn_mapped for 32bit
Even on 32bit 2MB pages can map more memory than is in the true
max_low_pfn if end_pfn is not highmem and not aligned to 2MB.
Add a end_pfn_map similar to x86-64 that accounts for this
fact. This is important for code that really needs to know about
all mapping aliases.
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: andreas.herrmann3@amd.com
Cc: mingo@elte.hu
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-x86/page.h b/include/asm-x86/page.h
index a05b289..b734939 100644
--- a/include/asm-x86/page.h
+++ b/include/asm-x86/page.h
@@ -36,7 +36,7 @@
#define max_pfn_mapped end_pfn_map
#else
#include <asm/page_32.h>
-#define max_pfn_mapped max_low_pfn
+#define max_pfn_mapped end_pfn_map
#endif /* CONFIG_X86_64 */
#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
@@ -50,6 +50,8 @@
extern int page_is_ram(unsigned long pagenr);
+extern unsigned long end_pfn_map;
+
struct page;
static inline void clear_user_page(void *page, unsigned long vaddr,