swiotlb: Remove the swiotlb variable usage

POWERPC doesn't expect it to be used.

This fixes the linux-next build failure reported by
Stephen Rothwell:

  lib/swiotlb.c: In function 'setup_io_tlb_npages':
  lib/swiotlb.c:114: error: 'swiotlb' undeclared (first use in this function)

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: peterz@infradead.org
LKML-Reference: <20091112000258F.fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

4 files changed, 18 insertions, 10 deletions

diff --git a/arch/x86/include/asm/swiotlb.h b/arch/x86/include/asm/swiotlb.h
index b9e4e20174fb..940f13a213f8 100644
--- a/arch/x86/include/asm/swiotlb.h
+++ b/arch/x86/include/asm/swiotlb.h
@@ -9,11 +9,12 @@ extern int swiotlb_force;
 
 #ifdef CONFIG_SWIOTLB
 extern int swiotlb;
-extern void pci_swiotlb_init(void);
+extern int pci_swiotlb_init(void);
 #else
 #define swiotlb 0
-static inline void pci_swiotlb_init(void)
+static inline int pci_swiotlb_init(void)
 {
+        return 0;
 }
 #endif
 
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index f79870e89266..0b11bf18f540 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -125,16 +125,13 @@ static void __init dma32_free_bootmem(void)
 
 void __init pci_iommu_alloc(void)
 {
-        /* swiotlb is forced by the boot option */
-        int use_swiotlb = swiotlb;
 #ifdef CONFIG_X86_64
         /* free the range so iommu could get some range less than 4G */
         dma32_free_bootmem();
 #else
         dma_ops = &nommu_dma_ops;
 #endif
-        pci_swiotlb_init();
-        if (use_swiotlb)
+        if (pci_swiotlb_init())
                 return;
 
         gart_iommu_hole_init();
diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index 17ce4221bd03..a6e5d0ffa3a7 100644
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c
@@ -42,16 +42,27 @@ static struct dma_map_ops swiotlb_dma_ops = {
         .dma_supported = NULL,
 };
 
-void __init pci_swiotlb_init(void)
+/*
+ * pci_swiotlb_init - initialize swiotlb if necessary
+ *
+ * This returns non-zero if we are forced to use swiotlb (by the boot
+ * option).
+ */
+int __init pci_swiotlb_init(void)
 {
         /* don't initialize swiotlb if iommu=off (no_iommu=1) */
 #ifdef CONFIG_X86_64
         if (!no_iommu && max_pfn > MAX_DMA32_PFN)
                 swiotlb = 1;
 #endif
+        if (swiotlb_force)
+                swiotlb = 1;
+
         if (swiotlb) {
                 swiotlb_init(0);
                 dma_ops = &swiotlb_dma_ops;
         } else
                 dma_ops = &nommu_dma_ops;
+
+        return swiotlb_force;
 }
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index e6755a0574fb..795472d8ae24 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -109,10 +109,9 @@ setup_io_tlb_npages(char *str)
         }
         if (*str == ',')
                 ++str;
-        if (!strcmp(str, "force")) {
+        if (!strcmp(str, "force"))
                 swiotlb_force = 1;
-                swiotlb = 1;
-        }
+
         return 1;
 }
 __setup("swiotlb=", setup_io_tlb_npages);