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Diffstat (limited to 'arch/um/kernel/tt/unmap.c')
-rw-r--r--arch/um/kernel/tt/unmap.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/um/kernel/tt/unmap.c b/arch/um/kernel/tt/unmap.c
new file mode 100644
index 000000000000..3f7aecdbe532
--- /dev/null
+++ b/arch/um/kernel/tt/unmap.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <sys/mman.h>
+
+int switcheroo(int fd, int prot, void *from, void *to, int size)
+{
+ if(munmap(to, size) < 0){
+ return(-1);
+ }
+ if(mmap(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) != to){
+ return(-1);
+ }
+ if(munmap(from, size) < 0){
+ return(-1);
+ }
+ return(0);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */