pageflags: get rid of FLAGS_RESERVED

[linux-2.6-omap-h63xx.git] / arch / sparc64 / mm / init.c

diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index 177d8aaeec42e2d147b92617dd308afa9c2baec1..8c2b50e8abc63d7696386f96d0ce06c62003c1fc 100644 (file)
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -1699,9 +1699,21 @@ void __init paging_init(void)
         * functions like clear_dcache_dirty_cpu use the cpu mask
         * in 13-bit signed-immediate instruction fields.
         */
-       BUILD_BUG_ON(FLAGS_RESERVED != 32);
+
+       /*
+        * Page flags must not reach into upper 32 bits that are used
+        * for the cpu number
+        */
+       BUILD_BUG_ON(NR_PAGEFLAGS > 32);
+
+       /*
+        * The bit fields placed in the high range must not reach below
+        * the 32 bit boundary. Otherwise we cannot place the cpu field
+        * at the 32 bit boundary.
+        */
        BUILD_BUG_ON(SECTIONS_WIDTH + NODES_WIDTH + ZONES_WIDTH +
-                    ilog2(roundup_pow_of_two(NR_CPUS)) > FLAGS_RESERVED);
+               ilog2(roundup_pow_of_two(NR_CPUS)) > 32);
+
        BUILD_BUG_ON(NR_CPUS > 4096);
 
        kern_base = (prom_boot_mapping_phys_low >> 22UL) << 22UL;