1__FFS(9)                   Basic C Library Functions                  __FFS(9)
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NAME

6       __ffs - find first set bit in word
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SYNOPSIS

9       unsigned long __ffs(unsigned long word);
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ARGUMENTS

12       word
13           The word to search
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DESCRIPTION

16       Undefined if no bit exists, so code should check against 0 first.
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COPYRIGHT

19Kernel Hackers Manual 2.6.         June 2019                          __FFS(9)