Re: __buggy_fxsr_alignment() not found.

["Randy.Dunlap" <rddunlap@osdl.org>]

On Sun, 29 Feb 2004 20:02:12 +0300 (MSK) Igor Yu. Zhbanov wrote:

| Hello!
| My system is:
| AMD K6-II 450
| Linux-2.4.24
| glibc-2.2.5
| 
| I cannot compile 2.4.24 kernel because linker says:
| init/main.o: In function `check_fpu':
| init/main.o(.text.init+0x53): undefined reference to `__buggy_fxsr_alignment'
| 
| It's prototype is in inculude/asm-i386/bugs.h:
| -----
| /* Enable FXSR and company _before_ testing for FP problems. */
|         /*
|          * Verify that the FXSAVE/FXRSTOR data will be 16-byte aligned.
|          */
|         if (offsetof(struct task_struct, thread.i387.fxsave) & 15) {
|               extern void __buggy_fxsr_alignment(void);
|               __buggy_fxsr_alignment();
| -----
| But there is no realisation of this function in source files.
| When I comment the lines above, everything works.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This function is not supposed to be defined anywhere.
It is there to indicate a build error and to keep the kernel
build from completing successfully.

For some reason, with your config (and CPU arch.) and compiler,
the 'fxsave' field is not on a 16-byte alignment.  Have you applied
any patches to 2.4.24?  What version of gcc are you using (gcc -v)?

--
~Randy