diff options
| author | Andreas Schwab <schwab@linux-m68k.org> | 2014-04-24 12:24:48 +0200 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2014-05-28 10:11:54 +0200 |
| commit | 486df8bc4627bdfc032d11bedcd056cc5343ee62 (patch) | |
| tree | 758edca69ce10df13802ae2035f3f677552c61f4 /arch/m68k/mm | |
| parent | 44074e892cc2e5579b8d75c37612fcf8d023554a (diff) | |
m68k: Increase initial mapping to 8 or 16 MiB if possible
If the size of the first memory chunk is at least 8 or 16 MiB increase the
initial mapping to 8 resp. 16 MiB instead of 4 MiB.
This makes it possible to
1. Map more memory in the first node without running out of space for the
page tables,
2. Boot kernels that don't fit in 4 MiB (e.g. multi_defconfig).
Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
- Add support for 8 MiB,
- Store initial mapping size in head.S for later reuse,
- Add comment about large kernels.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/mm')
| -rw-r--r-- | arch/m68k/mm/motorola.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c index 7d4024432163..b958916e5eac 100644 --- a/arch/m68k/mm/motorola.c +++ b/arch/m68k/mm/motorola.c @@ -45,7 +45,7 @@ EXPORT_SYMBOL(mm_cachebits); #endif /* size of memory already mapped in head.S */ -#define INIT_MAPPED_SIZE (4UL<<20) +extern __initdata unsigned long m68k_init_mapped_size; extern unsigned long availmem; @@ -271,10 +271,12 @@ void __init paging_init(void) */ addr = m68k_memory[0].addr; size = m68k_memory[0].size; - free_bootmem_node(NODE_DATA(0), availmem, min(INIT_MAPPED_SIZE, size) - (availmem - addr)); + free_bootmem_node(NODE_DATA(0), availmem, + min(m68k_init_mapped_size, size) - (availmem - addr)); map_node(0); - if (size > INIT_MAPPED_SIZE) - free_bootmem_node(NODE_DATA(0), addr + INIT_MAPPED_SIZE, size - INIT_MAPPED_SIZE); + if (size > m68k_init_mapped_size) + free_bootmem_node(NODE_DATA(0), addr + m68k_init_mapped_size, + size - m68k_init_mapped_size); for (i = 1; i < m68k_num_memory; i++) map_node(i); |