[Xenomai-help] 2.6 kernel module with math functions

[Cedric Herreman <glocker50@domain.hid>]

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Hello,
 
 I am porting a 2.4 RTAI kernel module to Xenomai 2.0 kernel 2.6. I used some basic math functions in the original module. This is posing problems for me now.
 
 In the module source i include <math.h>. I add -I/usr/include to the compiler flags and also "-ffast-math -mhard-float".
 
 If i compile this, i get warnings about double definitions of "__attribute_pure__" and "__attribute_used__".
 
 If i insert the kernel module, i get an error message :
 "Xenomai: Invalid use of FPU in Xenomai context at " + probably the address of the instruction where the math function is called.
 
 Can anyone give me a hint ? Thanks.
 
 This is the makefile  :
 
 obj-m    := rt_canio.o
 
 XENODIR = /usr/realtime
 
 KDIR    := /lib/modules/2.6.13.3/build
 PWD    := $(shell pwd)
 
 EXTRA_CFLAGS := -I$(XENODIR)/include -I/usr/include -ffast-math -mhard-float 
 
 all:
     $(MAKE) -C $(KDIR) M=$(PWD) modules
 
 clean:
     $(MAKE) -C $(KDIR) M=$(PWD) clean
 
 

		
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