mm-page_alloc-always-initialize-memory-map-for-the-holes-fix

It appears that petalogix-ml605 memory starts at 0x50000, but microblaze's
pfn_valid does not reject pfns < ARCH_PFN_OFFSET.

Link: https://lkml.kernel.org/r/YQWW3RCE4eWBuMu/@kernel.org
Tested-by: Guenter Roeck <linux@roeck-us.net>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

diff --git a/arch/microblaze/include/asm/page.h b/arch/microblaze/include/asm/page.h
index ce550978f4fc243b6b6bb4facf06344f5f772c78..4b8b2fa78fc5ff10516ab97ac53c5b622e58b33e 100644 (file)
--- a/arch/microblaze/include/asm/page.h
+++ b/arch/microblaze/include/asm/page.h
@@ -112,8 +112,7 @@ extern int page_is_ram(unsigned long pfn);
 #  define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
 
 #  define ARCH_PFN_OFFSET      (memory_start >> PAGE_SHIFT)
-#  define pfn_valid(pfn)       ((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
-
+#  define pfn_valid(pfn)       ((pfn) >= ARCH_PFN_OFFSET && (pfn) < (max_mapnr + ARCH_PFN_OFFSET))
 # endif /* __ASSEMBLY__ */
 
 #define        virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))