[alsa-devel] [PATCH 5/6] ARM: ux500: Enable HIGHMEM on all mop500 platforms

Arnd Bergmann arnd at arndb.de
Tue Jul 31 22:50:02 CEST 2012

On Tuesday 31 July 2012, Russell King - ARM Linux wrote:
> I still fail to see how not having highmem enabled would ever cause memory
> corruption errors (unless something dealing with memory in a very very
> wrong way - iow, not using one of the reservation or memory allocation
> methods provided by the kernel.)

The problem is that all users of ux500 systems pass a command line like

vmalloc=256M mem=128M at 0 mali.mali_mem=32M at 128M hwmem=168M at 160M mem=48M at 328M mem_issw=1M at 383M mem=640M at 384M

This is of course totally bogus and should not be done. If I understand
Lee correctly, one of the issues resulting from passing a command
line like this without enabling highmem is memory corruption.

"Doctor it hurts when I do this ..."


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