On Wed, 1 Oct 2003, Raghu R. Arur wrote:

 
 In 2.4.19 linux, I see that 9th bit of page->flags is not used for any 
flag. Is there a particular reason for doing so?

Up to 2.4.9 there was #define PG_swap_cache 9, but we deleted that as
unnecessary in 2.4.10, changing the PageSwapCache macro.  It happens
to have stayed free ever since in 2.4, but I don't believe there's a
curse on that bit.

Hugh

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