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-rw-r--r--lib/strnlen_user.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/strnlen_user.c b/lib/strnlen_user.c
index 90900ecfeb54..a28df5206d95 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
/*