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use the new bitfield accessor macros

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Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Felix Fietkau
2016-09-04 17:37:26 +02:00
parent 53c1b7f6ac
commit b300bdc42e
17 changed files with 183 additions and 241 deletions
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util.h
+1 -59
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@@ -17,65 +17,7 @@
#include <linux/skbuff.h>
#include <linux/bitops.h>
#ifndef GENMASK
#define GENMASK(h, l) (((U32_C(1) << ((h) - (l) + 1)) - 1) << (l))
#endif
/*
* Power of two check, this will check
* if the mask that has been given contains and contiguous set of bits.
* Note that we cannot use the is_power_of_2() function since this
* check must be done at compile-time.
*/
#define is_power_of_two(x) ( !((x) & ((x)-1)) )
#define low_bit_mask(x) ( ((x)-1) & ~(x) )
#define is_valid_mask(x) is_power_of_two(1LU + (x) + low_bit_mask(x))
/*
* Macros to find first set bit in a variable.
* These macros behave the same as the __ffs() functions but
* the most important difference that this is done during
* compile-time rather then run-time.
*/
#define compile_ffs2(__x) \
__builtin_choose_expr(((__x) & 0x1), 0, 1)
#define compile_ffs4(__x) \
__builtin_choose_expr(((__x) & 0x3), \
(compile_ffs2((__x))), \
(compile_ffs2((__x) >> 2) + 2))
#define compile_ffs8(__x) \
__builtin_choose_expr(((__x) & 0xf), \
(compile_ffs4((__x))), \
(compile_ffs4((__x) >> 4) + 4))
#define compile_ffs16(__x) \
__builtin_choose_expr(((__x) & 0xff), \
(compile_ffs8((__x))), \
(compile_ffs8((__x) >> 8) + 8))
#define compile_ffs32(__x) \
__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
* The mask should be a constant non-zero contiguous set of bits which
* does not exceed the given typelimit.
*/
#define FIELD_CHECK(__mask) \
BUILD_BUG_ON(!(__mask) || !is_valid_mask(__mask))
#define MT76_SET(_mask, _val) \
({ FIELD_CHECK(_mask); (((u32) (_val)) << compile_ffs32(_mask)) & _mask; })
#define MT76_GET(_mask, _val) \
({ FIELD_CHECK(_mask); (u32) (((_val) & _mask) >> compile_ffs32(_mask)); })
#include <linux/bitfield.h>
#define MT76_INCR(_var, _size) \
_var = (((_var) + 1) % _size)