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rt2x00: Use __builtin_choose_expr() instead of ?: 

To really force the FIELD macros to determine
the first bit of the register field we should
use the __builtin_choose_expr() function.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ivo van Doorn 2008-06-06 22:58:29 +02:00 committed by John W. Linville
parent a26cbc6508
commit 4ae1168199
1 changed files with 13 additions and 9 deletions
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22
drivers/net/wireless/rt2x00/rt2x00reg.h
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@ -145,23 +145,27 @@ struct rt2x00_field32 {
* compile-time rather then run-time.
*/
#define compile_ffs2(__x) \
( ((__x) & 0x1) ? 0 : 1 )
__builtin_choose_expr(((__x) & 0x1), 0, 1)
#define compile_ffs4(__x) \
( ((__x) & 0x3) ? \
compile_ffs2(__x) : (compile_ffs2((__x) >> 2) + 2) )
__builtin_choose_expr(((__x) & 0x3), \
(compile_ffs2((__x))), \
(compile_ffs2((__x) >> 2) + 2))
#define compile_ffs8(__x) \
( ((__x) & 0xf) ? \
compile_ffs4(__x) : (compile_ffs4((__x) >> 4) + 4) )
__builtin_choose_expr(((__x) & 0xf), \
(compile_ffs4((__x))), \
(compile_ffs4((__x) >> 4) + 4))
#define compile_ffs16(__x) \
( ((__x) & 0xff) ? \
compile_ffs8(__x) : (compile_ffs8((__x) >> 8) + 8) )
__builtin_choose_expr(((__x) & 0xff), \
(compile_ffs8((__x))), \
(compile_ffs8((__x) >> 8) + 8))
#define compile_ffs32(__x) \
( ((__x) & 0xffff) ? \
compile_ffs16(__x) : (compile_ffs16((__x) >> 16) + 16) )
__builtin_choose_expr(((__x) & 0xffff), \
(compile_ffs16((__x))), \
(compile_ffs16((__x) >> 16) + 16))
/*
* This macro will check the requirements for the FIELD{8,16,32} macros