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>

1 files changed, 5 insertions, 10 deletions

diff --git a/arch/x86/kernel/traps_32.c b/arch/x86/kernel/traps_32.c
index 3cf72977d012..b22c01e05a18 100644
--- a/arch/x86/kernel/traps_32.c
+++ b/arch/x86/kernel/traps_32.c
@@ -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");