Hello ,
I am developing a feature in a X86-64 machine running kernel 3.5.5. I am exporting this symbol to test FPU and kernel compiles fine if I call this symbol from my module it works great. But when I used this symbol from scheduler particularly enqueue_fair() (few times per second) in/kernel/sched/fair.c it behaves weirdly. During boot kernel hangs abruptly after few hundreds correct prints in this function after 1st print.
Am I missing any rule, because I looked it up on internet they says nothing else than this way to use fpu. Any help is appreciated. I tried 10-20 boots and each time it hangs.
Code snippet for reference:
1 /*test FPU*/
2 #include <asm/i387.h>
3 #include <linux/time.h>
4
5
6 void my_symbol(void){
7 unsigned long i = get_seconds();
8
9 printk(KERN_DEBUG "i:%lu,",i);
10 kernel_fpu_begin();
11 float d = 3.123456*(i%3);
12 i=(unsigned long)(d*1000000);
13 kernel_fpu_end();
14 printk(KERN_DEBUG "%lu\n",i);
15 }
16 EXPORT_SYMBOL_GPL(my_symbol);
thanks
Digant Desai.
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