📄 int_sqrt.c
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#include <linux/kernel.h>#include <linux/module.h>/** * int_sqrt - rough approximation to sqrt * @x: integer of which to calculate the sqrt * * A very rough approximation to the sqrt() function. */unsigned long int_sqrt(unsigned long x){ unsigned long op, res, one; op = x; res = 0; one = 1UL << (BITS_PER_LONG - 2); while (one > op) one >>= 2; while (one != 0) { if (op >= res + one) { op = op - (res + one); res = res + 2 * one; } res /= 2; one /= 4; } return res;}EXPORT_SYMBOL(int_sqrt);
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