From b18485e7acfe1a634615d1c628ef644c0d58d472 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Thu, 12 Nov 2009 00:03:28 +0900 Subject: [PATCH] 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 Signed-off-by: FUJITA Tomonori Cc: peterz@infradead.org LKML-Reference: <20091112000258F.fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar --- arch/x86/include/asm/swiotlb.h | 5 +++-- arch/x86/kernel/pci-dma.c | 5 +---- arch/x86/kernel/pci-swiotlb.c | 13 ++++++++++++- lib/swiotlb.c | 5 ++--- 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); -- 2.20.1