For those MMUs that have some form of bolt'd linear mapping (TLB) required its rare that one ever sets mem= smaller than the size of that mapping.
However, on Book-E 64 parts the initial linear mapping is quite large (1G) so its quite reasonable that mem= is set smaller than that. We need to parse the command line for mem= limit and constrain the amount of memory we map initially by it if need be. Signed-off-by: Kumar Gala <ga...@kernel.crashing.org> --- arch/powerpc/kernel/prom.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-) diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 174e1e9..87902de 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -723,12 +723,15 @@ void __init early_init_devtree(void *params) of_scan_flat_dt(early_init_dt_scan_root, NULL); of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL); - setup_initial_memory_limit(memstart_addr, first_memblock_size); /* Save command line for /proc/cmdline and then parse parameters */ strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); parse_early_param(); + /* make sure we've parsed cmdline for mem= before this */ + if (memory_limit) + first_memblock_size = min(first_memblock_size, memory_limit); + setup_initial_memory_limit(memstart_addr, first_memblock_size); /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */ memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START); /* If relocatable, reserve first 32k for interrupt vectors etc. */ -- 1.7.3.4 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev