[PATCH 1/2] powerpc: respect mem= setting for early memory limit setup
From: Kumar Gala <hidden>
Date: 2011-09-16 15:40:03
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
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 <redacted> --- 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. */
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1.7.3.4