Messages in this thread | | | Date | Mon, 3 Feb 2014 14:40:57 +0530 | Subject | Issue Float point in ARM WARNING: "__aeabi_d2iz" | From | naveen yadav <> |
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Dear All,
We are using ARM SOC cortex A15. we are running 3.10.x kernel. I am using gcc 4.6
I need floating point in kernel module. So when I build I got warning WARNING: "__aeabi_d2iz" [/home/test/tt/hello.ko] undefined! WARNING: "__aeabi_dmul" [/home/test/tt/hello.ko] undefined! WARNING: "__aeabi_dsub" [/home/test/tt/hello.ko] undefined! WARNING: "__aeabi_ddiv" [/home/test/tt/hello.ko] undefined! WARNING: "__aeabi_f2d" [/home/test/tt/hello.ko] undefined!
static int __init hello_init(void) { float a=3.14; float b=3.1222; b=7.2/a ; printk(KERN_INFO "Hello world! %f\n",a/b); return 0; // Non-zero return means that the module couldn't be loaded. } static void __exit hello_cleanup(void) { printk(KERN_INFO "Cleaning up module.\n"); }
module_init(hello_init); module_exit(hello_cleanup);
So I change in my Linux kernel make file.
arch/arm/Makefile
I remove -msoft-float . -KBUILD_CFLAGS +=$(CFLAGS_ABI) $(CFLAGS_ISA) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float -Uarm -KBUILD_AFLAGS +=$(CFLAGS_ABI) $(AFLAGS_ISA) $(arch-y) $(tune-y) -include asm/unified.h -msoft-float +KBUILD_CFLAGS +=$(CFLAGS_ABI) $(CFLAGS_ISA) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -Uarm +KBUILD_AFLAGS +=$(CFLAGS_ABI) $(AFLAGS_ISA) $(arch-y) $(tune-y) -include asm/unified.h
I run my module and it work well. So my question is . 1. Is it correct way ? 2. will it effect my performance in normal scenario ? 3. how can I check more stability?
Regards.
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