rt2x00: Calculate register offset during compile time

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By using __ffs() the register offsets were always calculated
at run-time which all FIELD32/FIELD16 definitions were builtin
constants. This means we can heavily optimize the register handling
by allowing GCC to do all the work during compilation.

Add some compile_ffs() macros to perform the calculation at
compile time. After this each rt2x00 module size is reduced
by ~2500 bytes. And the stack size of several functions is reduced
as well which further limits the number of rt2x00 results in
'make checkstack'.

v2: Merge GertJan's bugfix of patch [1/11] directly into this patch
      instead of providing it as seperate patch.
v3: Add extra parentheses when bitshifting __x

Signed-off-by: Gertjan van Wingerde <gwingerde@kpnplanet.nl>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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This commit is contained in:

Ivo van Doorn 2008-06-03 22:45:35 +02:00 • committed by John W. Linville

parent 030352a9c7

commit 9dad92b9ba

1 changed files with 45 additions and 14 deletions

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59

drivers/net/wireless/rt2x00/rt2x00reg.h

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