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x86: fix sparse error in traps_32.c 

This was being used to ensure the proper alignment of the FXSAVE/FXRSTOR data.
This would create a sparse error in the _correct_ cases, hiding further
warnings.  Use BUILD_BUG_ON instead.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Harvey Harrison 2008-02-06 22:39:44 +01:00 committed by Ingo Molnar
parent 4a5a77d106
commit deef79ef35
1 changed files with 5 additions and 10 deletions
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15
arch/x86/kernel/traps_32.c
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@ -1176,17 +1176,12 @@ void __init trap_init(void)
#endif
set_trap_gate(19,&simd_coprocessor_error);
/*
* Verify that the FXSAVE/FXRSTOR data will be 16-byte aligned.
* Generate a build-time error if the alignment is wrong.
*/
BUILD_BUG_ON(offsetof(struct task_struct, thread.i387.fxsave) & 15);
if (cpu_has_fxsr) {
/*
* Verify that the FXSAVE/FXRSTOR data will be 16-byte aligned.
* Generates a compile-time "error: zero width for bit-field" if
* the alignment is wrong.
*/
struct fxsrAlignAssert {
int _:!(offsetof(struct task_struct,
thread.i387.fxsave) & 15);
};
printk(KERN_INFO "Enabling fast FPU save and restore... ");
set_in_cr4(X86_CR4_OSFXSR);
printk("done.\n");