Re: [patch] cache pipe buf page address for non-highmem arch
- From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 22 Mar 2007 17:01:22 -0800
On Thu, 22 Mar 2007 17:51:11 -0700 "Ken Chen" <kenchen@xxxxxxxxxx> wrote:
+#ifdef CONFIG_HIGHMEM
+#define pipe_kmap kmap
+#define pipe_kmap_atomic kmap_atomic
+#else /* CONFIG_HIGHMEM */
+static inline void *pipe_kmap(struct page *page)
+{
+ return (void *) page->private;
+}
+static inline void *pipe_kmap_atomic(struct page *page, enum km_type type)
+{
+ pagefault_disable();
+ return pipe_kmap(page);
+}
+#endif
If we're going to do this then we should also implement pipe_kunmap_atomic().
Relying upon kunmap_atomic() internals like this is weird-looking, and is fragile
against future changes to kunmap_atomic().
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