|__BITMAP_SHIFT_LEFT(9)||Basic Kernel Library Functions||__BITMAP_SHIFT_LEFT(9)|
__bitmap_shift_left - logical left shift of the bits in a bitmap
void __bitmap_shift_left(unsigned long * dst, const unsigned long * src, unsigned int shift, unsigned int nbits);
Shifting left (multiplying) means moving bits in the LS -> MS direction. Zeros are fed into the vacated LS bit positions and those MS bits shifted off the top are lost.
|January 2017||Kernel Hackers Manual 4.8.|