[RFC 1/4] ARM: dma-mapping: Refactor out to introduce __alloc_fill_pages
From: Hiroshi Doyu <hidden>
Date: 2012-08-22 10:21:35
Also in:
linux-arm-kernel, lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
__alloc_fill_pages() allocates power of 2 page number allocation at most repeatedly. Signed-off-by: Hiroshi Doyu <redacted> --- arch/arm/mm/dma-mapping.c | 40 ++++++++++++++++++++++++++++------------ 1 files changed, 28 insertions(+), 12 deletions(-)
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 7dc61ed..aec0c06 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c@@ -988,19 +988,10 @@ static inline void __free_iova(struct dma_iommu_mapping *mapping, spin_unlock_irqrestore(&mapping->lock, flags); } -static struct page **__iommu_alloc_buffer(struct device *dev, size_t size, gfp_t gfp) +static int __alloc_fill_pages(struct page ***ppages, int count, gfp_t gfp) { - struct page **pages; - int count = size >> PAGE_SHIFT; - int array_size = count * sizeof(struct page *); int i = 0; - - if (array_size <= PAGE_SIZE) - pages = kzalloc(array_size, gfp); - else - pages = vzalloc(array_size); - if (!pages) - return NULL; + struct page **pages = *ppages; while (count) { int j, order = __fls(count);
@@ -1022,11 +1013,36 @@ static struct page **__iommu_alloc_buffer(struct device *dev, size_t size, gfp_t count -= 1 << order; } - return pages; + return 0; + error: while (i--) if (pages[i]) __free_pages(pages[i], 0); + return -ENOMEM; +} + +static struct page **__iommu_alloc_buffer(struct device *dev, size_t size, + gfp_t gfp) +{ + struct page **pages; + int count = size >> PAGE_SHIFT; + int array_size = count * sizeof(struct page *); + int err; + + if (array_size <= PAGE_SIZE) + pages = kzalloc(array_size, gfp); + else + pages = vzalloc(array_size); + if (!pages) + return NULL; + + err = __alloc_fill_pages(&pages, count, gfp); + if (err) + goto error + + return pages; +error: if (array_size <= PAGE_SIZE) kfree(pages); else
--
1.7.5.4
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