[PATCH 1/2] lib: Fix generic strnlen_user for 32-bit big-endian machines

[Paul Mackerras]

The aligned_byte_mask() definition is wrong for 32-bit big-endian
machines: the "7-(n)" part of the definition assumes a long is 8
bytes.  This fixes it by using BITS_PER_LONG - 8 instead of 8*7.
Tested on 32-bit and 64-bit PowerPC.

Signed-off-by: Paul Mackerras <paulus at samba.org>
---
 lib/strnlen_user.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/strnlen_user.c b/lib/strnlen_user.c
index 90900ec..a28df52 100644
--- a/lib/strnlen_user.c
+++ b/lib/strnlen_user.c
@@ -8,7 +8,7 @@
 #ifdef __LITTLE_ENDIAN
 #  define aligned_byte_mask(n) ((1ul << 8*(n))-1)
 #else
-#  define aligned_byte_mask(n) (~0xfful << 8*(7-(n)))
+#  define aligned_byte_mask(n) (~0xfful << (BITS_PER_LONG - 8 - 8*(n)))
 #endif
 
 /*
-- 
1.7.10.rc3.219.g53414