Re: [PATCH] ARM: fix bug which lowmem size is limited to 760MB

From: Arnd Bergmann
Date: Mon Sep 07 2015 - 07:41:53 EST

On Thursday 03 September 2015 21:24:00 Nicolas Pitre wrote:
> If 768MB targets were common place then it could be worth changing the
> default vmalloc size to accommodate this memory size and testing all the
> other targets to make sure no regressions are introduced. But given it
> is easy to change the default via the kernel cmdline, and that you lose
> only 8 MB otherwise, I don't think it is worth the trouble and/or the
> risk.


Given how much more common 1GB hardware configurations are compared to 768MB
configuration, we could however think about adding a VMSPLIT_3G_OPT option
that x86 has (also VMSPLIT_2_75G on ARCH_TILE), to allow using the entire
1GB of lowmem without going all the way to VMSPLIT_2G. That option would
also let us use the entire 768MB on the machines that Yongtaek Lee is
interested in.

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