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lib: Fix generic strnlen_user for 32-bit big-endian machines

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@samba.org>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 parent 1e2aec8 commit 69ea6405980f217557b6a58f70ff60d8d88519a5 @paulusmack paulusmack committed with May 28, 2012
Showing with 1 addition and 1 deletion.
  1. +1 −1 lib/strnlen_user.c
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2 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
/*

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