Messages in this thread | | | Date | Sun, 20 Jan 2008 20:30:59 +0200 | From | Mika Penttilä <> | Subject | Re: [PATCH] x86: Construct 32 bit boot time page tables in native format. |
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> + * This is how much memory *in addition to the memory covered up to > + * and including _end* we need mapped initially. We need one bit for > + * each possible page, but only in low memory, which means > + * 2^32/4096/8 = 128K worst case (4G/4G split.) > + * > + * Modulo rounding, each megabyte assigned here requires a kilobyte of > + * memory, which is currently unreclaimed. > + * > + * This should be a multiple of a page. > + */ > +#define INIT_MAP_BEYOND_END (128*1024) > + > +/* >
You have dropped the requirement to map all of low memory (the boot allocator is used for instance to construct physical mem mapping). Either you should fix your INIT_MAP_BEYOND_END or make a big comment telling us why it isn't necessary anymore to map low mem.
--Mika
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