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Date: Fri, 01 Dec 2006 16:34:17 +0800 From: Shaohua Li <shaohua.li@...el.com> To: Jens Axboe <jens.axboe@...cle.com> Cc: lkml <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...l.org> Subject: Re: [patch]VMSPLIT_2G conflicts with PAE On Fri, 2006-12-01 at 08:55 +0100, Jens Axboe wrote: > On Fri, Dec 01 2006, Shaohua Li wrote: > > PAGE_OFFSET is 0x78000000 with VMSPLIT_2G, this address is in the middle > > of the second pgd entry with pae enabled. This breaks assumptions > > (address is aligned to pgd entry's address) in a lot of places like > > pagetable_init. Fixing the assumptions is hard (eg, low mapping). SO I > > just changed the address to 0x80000000. > > > > Signed-off-by: Shaohua Li <shaohua.li@...el.com> > > > > diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig > > index 8ff1c6f..fddfb26 100644 > > --- a/arch/i386/Kconfig > > +++ b/arch/i386/Kconfig > > @@ -532,7 +532,7 @@ endchoice > > config PAGE_OFFSET > > hex > > default 0xB0000000 if VMSPLIT_3G_OPT > > - default 0x78000000 if VMSPLIT_2G > > + default 0x80000000 if VMSPLIT_2G > > default 0x40000000 if VMSPLIT_1G > > default 0xC0000000 > > 0x78000000 was chosen since it gives you the full 2G as low memory, if > you mave it 0x80000000 then you still have a little highmem and need > that turned on. Ok, Maybe the x86 relocatable patch (it seems removed the low identity mapping) can help here. With it, we just need to fix pagetable_init. Thanks, Shaohua - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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