x86, AMD IOMMU, build fix #2

fix:

 arch/x86/kernel/amd_iommu.c: In function ‘amd_iommu_init_dma_ops':
 arch/x86/kernel/amd_iommu.c:940: error: lvalue required as left operand of assignment
 arch/x86/kernel/amd_iommu.c:941: error: lvalue required as left operand of assignment

due to !CONFIG_GART_IOMMU.
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/amd_iommu.c

@@ -937,8 +937,10 @@ int __init amd_iommu_init_dma_ops(void)
 	iommu_detected = 1;
 	force_iommu = 1;
 	bad_dma_address = 0;
+#ifdef CONFIG_GART_IOMMU
 	gart_iommu_aperture_disabled = 1;
 	gart_iommu_aperture = 0;
+#endif
 
 	dma_ops = &amd_iommu_dma_ops;
 

arch/x86/kernel/amd_iommu_init.c

@@ -801,8 +801,10 @@ void __init amd_iommu_detect(void)
 
 	if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) {
 		iommu_detected = 1;
+#ifdef CONFIG_GART_IOMMU
 		gart_iommu_aperture_disabled = 1;
 		gart_iommu_aperture = 0;
+#endif
 	}
 }
 

include/asm-x86/gart.h

@@ -20,6 +20,7 @@ extern int fix_aperture;
 #else
 #define gart_iommu_aperture		0
 #define gart_iommu_aperture_allowed	0
+#define gart_iommu_aperture_disabled	1
 
 static inline void early_gart_iommu_check(void)
 {