Re: innd mmap bug in 2.4.0-test12

From: Linus Torvalds (
Date: Wed Dec 27 2000 - 18:41:04 EST

On Wed, 27 Dec 2000, Rik van Riel wrote:
> The (trivial) patch below should fix this problem.

It must be wrong.

If we have a dirty page on the LRU lists, that page _must_ have a mapping.

What semantics would you say a non-mapped page has? What are the LRU
routines supposed to do with such a page?

The bug is somewhere else, and your patch is just papering it over. We
should not have a page without a mapping on the LRU lists in the first
place, except if the page has anonymous buffers (and such a page cannot
legally be dirty as things are in the standard kernel - Chris Mason has
been working on stuff that would make that a normal thing, but it would
also make the page have a mapping).

We'd better add a debug check that makes sure that we don't have
non-mapped non-buffer pages on the LRU lists, and figure out how such a
thing could happen.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
Please read the FAQ at

This archive was generated by hypermail 2b29 : Sun Dec 31 2000 - 21:00:10 EST