On Tue, Mar 01, 2022 at 12:28:58PM +0800, Tiezhu Yang wrote: > According to Documentation/admin-guide/kernel-parameters.txt, > the kernel command-line parameter mem= means "Force usage of > a specific amount of memory", but when add "mem=3G" to the > command-line, kernel boot hangs in sparse_init(). > > This commit is similar with the implementation of the other > archs such as arm64, powerpc and riscv, refactor the function > early_parse_mem() and then use memblock_enforce_memory_limit() > to limit the memory size. > > With this patch, when add "mem=3G" to the command-line, the > kernel boots successfully, we can see the following messages: unfortunately this patch would break platforms without memory detection, which simply use mem=32M for memory configuration. Not sure how many rely on this mechanism. If we can make sure nobody uses it, I'm fine with your patch. Thomas. -- Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ]
