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| author | Franck Bui-Huu <fbuihuu@gmail.com> | 2007-01-10 09:44:05 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2007-02-06 16:53:13 +0000 |
| commit | 6f284a2ce7b8bc49cb8455b1763357897a899abb (patch) | |
| tree | abf59702fad617780f59594aa8939db7ec4c76d6 /arch | |
| parent | db84dc61552ae0d198a8133d28b80c3838930ba8 (diff) | |
| download | linux-3.10-6f284a2ce7b8bc49cb8455b1763357897a899abb.tar.gz linux-3.10-6f284a2ce7b8bc49cb8455b1763357897a899abb.tar.bz2 linux-3.10-6f284a2ce7b8bc49cb8455b1763357897a899abb.zip | |
[MIPS] FLATMEM: introduce PHYS_OFFSET.
The old code was assuming that min_low_pfn was always 0. This
means that platforms having a big hole at their memory start
paid the price of wasting some memory for the allocation of
unused entries in mem_map[].
This patch prevents this waste.
It introduces PHYS_OFFSET define which is the start of the
physical memory and uses it wherever needed. Specially when
converting physical/virtual addresses into virtual/physical
ones.
Currently all platforms defines PHYS_OFFSET to 0.
Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/kernel/setup.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c index f352cd9c834..e1d76b87601 100644 --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c @@ -315,13 +315,17 @@ static void __init bootmem_init(void) if (min_low_pfn >= max_low_pfn) panic("Incorrect memory mapping !!!"); - if (min_low_pfn > 0) { + if (min_low_pfn > ARCH_PFN_OFFSET) { printk(KERN_INFO "Wasting %lu bytes for tracking %lu unused pages\n", - min_low_pfn * sizeof(struct page), - min_low_pfn); - min_low_pfn = 0; + (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page), + min_low_pfn - ARCH_PFN_OFFSET); + } else if (min_low_pfn < ARCH_PFN_OFFSET) { + printk(KERN_INFO + "%lu free pages won't be used\n", + ARCH_PFN_OFFSET - min_low_pfn); } + min_low_pfn = ARCH_PFN_OFFSET; /* * Determine low and high memory ranges |