fix mapping_gfp_mask usage

mapping_gfp_mask is not supposed to store allocation contex details, only page location details. So mapping_gfp_mask should be applied to the pagecache page allocation, wheras normal (kernel mapped) memory should be used for surrounding allocations such as radix-tree nodes allocated by add_to_page_cache. Context modifiers should be applied on a per-callsite basis.

So change splice to follow this convention (which is followed in similar code patterns in core code).

--

Index: linux-2.6/fs/splice.c
===================================================================
@@ -320,7 +320,7 @@ __generic_file_splice_read(struct file *
 				break;
 
 			error = add_to_page_cache_lru(page, mapping, index,
-						mapping_gfp_mask(mapping));
+						GFP_KERNEL);
 			if (unlikely(error)) {
 				page_cache_release(page);
 				if (error == -EEXIST)

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