BITMAP_ORD_TO_POS - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Basic Kernel Library Functions

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NAMEbitmap_ord_to_pos −

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SYNOPSISint bitmap_ord_to_pos(const unsigned long * buf, int ord, int bits);

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ARGUMENTSbuf pointer to bitmap ord ordinal bit position (n−th set bit, n >= 0) bits number of valid bit positions in buf

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DESCRIPTIONMap the ordinal offset of bit ord in buf to its position in buf​. Value of ord should be in range 0 <= ord < weight(buf), else results are undefined​. If for example, just bits 4 through 7 are set in buf, then ord values 0 through 3 will get mapped to 4 through 7, respectively, and all other ord values return undefined values​. When ord value 3 gets mapped to (returns) pos value 7 in this example, that means that the 3rd set bit (starting with 0th) is at position 7 in buf​. The bit positions 0 through bits are valid positions in buf​.

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