On Fri, 13 Nov 2020, Jinyang He wrote: > Commit: d3ff93380232 (mips: Make sure kernel memory is in iomem) > As I thought, this check is related to kdump. More directly, it is > related to the "mem=" parameter. Kexec-tools provide a "mem=" parameter > to limit the kernel location in kdump. But sometimes the memory may be not > enough and this check gives a way to ensure the capture kernel can > start rightly. Although "mem=" is not in kexec-tools now, I thought > it is also useful if someone use "mem=" to do other things.
I used to supply `mem=' by hand on many occasions across different MIPS systems and for various reasons over the last 20 years; surely before kexec was even thought of. The option itself has been there in the MIPS port since I added it to Linux 2.4.0 back in Dec 2000. Maciej
