PAGE_SIZE Availability Inconsistency

David Miller davem@davemloft.net
Thu Mar 8 21:48:00 GMT 2007


From: Anton Blanchard <anton@samba.org>
Date: Thu, 8 Mar 2007 15:42:36 -0600

> > The easiest way to fix this would be to always park the swap magic at 
> > the offset of the smallest page size in use, which is 4K.  This is 
> > analogous how the offset for the ext2/3 superblock got fixed at 1K -- 
> > for 1K blocks, it's the second block, but for larger blocks, it's part 
> > of the first block.  If we fix the offset of the swap magic at 4096 
> > minus the offset that's already there, it will always fall in the first 
> > page regardless of page size.
> 
> Yeah that makes sense. I gave it a go by creating a MIN_PAGE_SIZE
> define, and allowing an architecture to override it if required.

I might be missing something but doesn't this break every
SWAP partition that was created with something other than
MIN_PAGE_SIZE?



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