[PATCH v9 2/7] x86/dma: use IS_ENABLED() to simplify the code

[Zhen Lei <thunder.leizhen@xxxxxxxxxx>]

Remove the ifdefs around CONFIG_IOMMU_DEFAULT_PASSTHROUGH to improve
readablity.

Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
---
 arch/x86/kernel/pci-dma.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index dcd272dbd0a9330..8c82b2e28a0fe2d 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -43,11 +43,7 @@
  * It is also possible to disable by default in kernel config, and enable with
  * iommu=nopt at boot time.
  */
-#ifdef CONFIG_IOMMU_DEFAULT_PASSTHROUGH
-int iommu_pass_through __read_mostly = 1;
-#else
-int iommu_pass_through __read_mostly;
-#endif
+int iommu_pass_through __read_mostly =	IS_ENABLED(CONFIG_IOMMU_DEFAULT_PASSTHROUGH);
 
 extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
 
-- 
1.8.3