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float.c

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/* https://cirosantilli.com/linux-kernel-module-cheat#floating-point-in-kernel-modules */

#include <linux/kernel.h>

#include <linux/module.h>

#include <asm/fpu/api.h> /* kernel_fpu_begin, kernel_fpu_end */

/* float params are not supported, so we just go with int. */

static int myfloat = 1;

static int enable_fpu = 1;

module_param(myfloat, int, S_IRUSR | S_IWUSR);

module_param(enable_fpu, int, S_IRUSR | S_IWUSR);

static int myinit(void)

{

if (enable_fpu) {

kernel_fpu_begin();

}

if ((float)myfloat + 1.5f == 2.5f) {

pr_info("magic value\n");

}

if (enable_fpu) {

kernel_fpu_end();

}

return 0;

}

static void myexit(void) {}

module_init(myinit)

module_exit(myexit)

MODULE_LICENSE("GPL");