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Bug#1989: mmap bug?

Package: kernel
Version: ?

The sources I'm using form libdb contain a patch that says:
+  * The Linux kernel mmap() semantics are broken :
+  *
+  * Under Linux, read only private mappings cause write only and read/write
+  * opens to fail with errno=ETXTBSY.  Shared read only mappings should work
+  * fine though, but I'm not familiar enough with the code to ascertain that
+  * a MAP_SHARED mapping would be safe so I use the non-mmap'd version
+  * instead.

I'd like to remove this patch if it is not needed anymore.

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