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drm: ati_pcigart: simplify page_count manipulations
From: Nick Piggin <npiggin@suse.de> Allocate a compound page for the user mapping instead of tweaking the page refcounts. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Dave Airlie <airlied@linux.ie>
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@ -59,17 +59,16 @@ static void *drm_ati_alloc_pcigart_table(void)
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int i;
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DRM_DEBUG("%s\n", __FUNCTION__);
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address = __get_free_pages(GFP_KERNEL, ATI_PCIGART_TABLE_ORDER);
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address = __get_free_pages(GFP_KERNEL | __GFP_COMP,
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ATI_PCIGART_TABLE_ORDER);
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if (address == 0UL) {
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return NULL;
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}
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page = virt_to_page(address);
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for (i = 0; i < ATI_PCIGART_TABLE_PAGES; i++, page++) {
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get_page(page);
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for (i = 0; i < ATI_PCIGART_TABLE_PAGES; i++, page++)
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SetPageReserved(page);
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}
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DRM_DEBUG("%s: returning 0x%08lx\n", __FUNCTION__, address);
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return (void *)address;
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@ -83,10 +82,8 @@ static void drm_ati_free_pcigart_table(void *address)
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page = virt_to_page((unsigned long)address);
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for (i = 0; i < ATI_PCIGART_TABLE_PAGES; i++, page++) {
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__put_page(page);
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for (i = 0; i < ATI_PCIGART_TABLE_PAGES; i++, page++)
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ClearPageReserved(page);
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}
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free_pages((unsigned long)address, ATI_PCIGART_TABLE_ORDER);
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}
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