Messages in this thread | | | Date | Thu, 28 Jun 2012 02:25:59 -0400 (EDT) | From | Nicolas Pitre <> | Subject | RE: [PATCH] [RESEND] arm: limit memblock base address for early_pte_alloc |
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On Thu, 28 Jun 2012, Kim, Jong-Sung wrote:
> > From: Dave Martin [mailto:dave.martin@linaro.org] > > Sent: Thursday, June 28, 2012 1:02 AM > > > > For me, it appears that this block just contains the initial region passed > > in ATAG_MEM or on the command line, with some reservations for > > swapper_pg_dir, the kernel text/data, device tree and initramfs. > > > > So far as I can tell, the only memory guaranteed to be mapped here is the > > kernel image: there may be no guarantee that there is any unused space in > > this region which could be used to allocate extra page tables. > > The rest appears during the execution of map_lowmem(). > > > > Cheers > > ---Dave > > Thank you for your comment, Dave! It was not that sophisticated choice, but > I thought that normal embedded system trying to reduce the BOM would have a > big-enough first memblock memory region. However you're right. There can be > exceptional systems. Then, how do you think about following manner: [...]
This still has some possibilities for failure.
Please have a look at the two patches I've posted to fix this in a better way.
Nicolas
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