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authorJaya Kumar <jayakumar.lkml@gmail.com>2007-05-08 11:37:37 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 22:15:26 +0400
commit60b59beafba875aef6d378078bce0baf2287ae14 (patch)
treebb599c0e2ad43ee8f515a9f9af009442931b6a37 /mm/rmap.c
parent3a2842480bbef42c3c90e14c1f378360d8c20a0c (diff)
downloadlinux-60b59beafba875aef6d378078bce0baf2287ae14.tar.xz
fbdev: mm: Deferred IO support
This implements deferred IO support in fbdev. Deferred IO is a way to delay and repurpose IO. This implementation is done using mm's page_mkwrite and page_mkclean hooks in order to detect, delay and then rewrite IO. This functionality is used by hecubafb. [adaplas] This is useful for graphics hardware with no directly addressable/mappable framebuffer. Implementing this will allow the "framebuffer" to be accesible from user space via mmap(). Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com> Signed-off-by: Antonino Daplas <adaplas@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/rmap.c')
-rw-r--r--mm/rmap.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index 75a32be64a21..304f51985c78 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -505,6 +505,7 @@ int page_mkclean(struct page *page)
return ret;
}
+EXPORT_SYMBOL_GPL(page_mkclean);
/**
* page_set_anon_rmap - setup new anonymous rmap