On 01.06.21 18:10, Olaf Hering wrote:
Introduce new API to test if a fixed number of bits is clear or set, and clear or set them all at once.
More precise: the new functions check whether BITS_PER_LONG bits are set or clear.
The caller has to make sure the input bitnumber is a multiply of BITS_PER_LONG.
s/multiply/multiple/
This API avoids the loop over each bit in a known range just to see if all of them are either clear or set. Signed-off-by: Olaf Hering <[email protected]> --- tools/libs/ctrl/xc_bitops.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/tools/libs/ctrl/xc_bitops.h b/tools/libs/ctrl/xc_bitops.h index f0bac4a071..92f38872fb 100644 --- a/tools/libs/ctrl/xc_bitops.h +++ b/tools/libs/ctrl/xc_bitops.h @@ -77,4 +77,29 @@ static inline void bitmap_or(void *_dst, const void *_other, dst[i] |= other[i]; }+static inline int test_bit_long_set(unsigned long nr_base, const void *_addr)
Make return type bool (here and below)?
+{
+ const unsigned long *addr = _addr;
+ unsigned long val = addr[nr_base / BITS_PER_LONG];
Add a blank line here (same below).
+ return val == ~0; > +}
+
+static inline int test_bit_long_clear(unsigned long nr_base, const void *_addr)
+{
+ const unsigned long *addr = _addr;
+ unsigned long val = addr[nr_base / BITS_PER_LONG];
+ return val == 0;
+}
+
+static inline void clear_bit_long(unsigned long nr_base, void *_addr)
+{
+ unsigned long *addr = _addr;
+ addr[nr_base / BITS_PER_LONG] = 0;
+}
+
+static inline void set_bit_long(unsigned long nr_base, void *_addr)
+{
+ unsigned long *addr = _addr;
+ addr[nr_base / BITS_PER_LONG] = ~0;
+}
#endif /* XC_BITOPS_H */
Juergen
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