parisc: Prevent ldil() to sign-extend into upper 32 bits

Add some build time checks to prevent that the various usages of
	"ldil L%(TMPALIAS_MAP_START), %reg"
sign-extends into the upper 32 bits when building a 64-bit kernel.

Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index 1dc2e88e7b04fc60eb80c65bc99887e415d2cec0..0a81499dd35e2b49a66f6addf00e9c554b7076de 100644 (file)
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -555,6 +555,12 @@ void __init mem_init(void)
        BUILD_BUG_ON(PT_INITIAL > PTRS_PER_PGD);
 #endif
 
+#ifdef CONFIG_64BIT
+       /* avoid ldil_%L() asm statements to sign-extend into upper 32-bits */
+       BUILD_BUG_ON(__PAGE_OFFSET >= 0x80000000);
+       BUILD_BUG_ON(TMPALIAS_MAP_START >= 0x80000000);
+#endif
+
        high_memory = __va((max_pfn << PAGE_SHIFT));
        set_max_mapnr(max_low_pfn);
        memblock_free_all();