Messages in this thread | | | Date | Thu, 24 Aug 2017 17:17:41 +0100 | From | Russell King - ARM Linux <> | Subject | Re: arch/arm/kernel/setup.c fails to compile for NOMMU |
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On Fri, Aug 18, 2017 at 01:24:02PM +0200, Michal Hocko wrote: > Hi Russel, > I have a battery of configs for compile testing and for some time I've > been seeing the following compilation error with nommu config (attached) > > arch/arm/kernel/setup.c: In function 'reserve_crashkernel': > arch/arm/kernel/setup.c:1005:25: error: 'SECTION_SIZE' undeclared (first > use in this function) > crash_size, SECTION_SIZE); > > I didn't get to look what is going on here, maybe my config is just too > artificial but the primary reason is that SECTION_SIZE is not defined in > pgtable-nommu.h. To be honest I am not familiar with nommu very much and > it smells like the whole reserve_crashkernel doesn't really make any > sense on those configs. Could you have a look what is the best fix > please?
Hi,
I suspect that mach-netx has never been tested in nommu configurations (ditto for many of the older platforms, which pre-date merging nommu support.)
Maybe the best solution is to make these old platforms depend on MMU.
However, I'm wondering whether kexec makes sense for !MMU - that's probably something that hasn't been tested and doesn't actually work. So maybe another approach would be to make kexec depend on MMU for ARM - but I'm afraid I don't really know.
I only have very limited nommu experience.
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