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authorKumar Gala <galak@kernel.crashing.org>2008-04-16 05:52:22 +1000
committerPaul Mackerras <paulus@samba.org>2008-04-17 07:46:13 +1000
commitd7917ba7051e3fd12ebe2d5a09b29fb3a2b38190 (patch)
tree339d273aee5eb2cb83e226945f0319b51f4bdf3c /arch/powerpc/mm/init_32.c
parent99c62dd773797b68f3b1ca6bb3274725d1852fa2 (diff)
downloadblackbird-op-linux-d7917ba7051e3fd12ebe2d5a09b29fb3a2b38190.tar.gz
blackbird-op-linux-d7917ba7051e3fd12ebe2d5a09b29fb3a2b38190.zip
[POWERPC] Introduce lowmem_end_addr to distinguish from total_lowmem
total_lowmem represents the amount of low memory, not the physical address that low memory ends at. If the start of memory is at 0 it happens that total_lowmem can be used as both the size and the address that lowmem ends at (or more specifically one byte beyond the end). To make the code a bit more clear and deal with the case when the start of memory isn't at physical 0, we introduce lowmem_end_addr that represents one byte beyond the last physical address in the lowmem region. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/mm/init_32.c')
-rw-r--r--arch/powerpc/mm/init_32.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index 1d7e5b8ade6a..ba61d088d2a2 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -146,6 +146,7 @@ void __init MMU_init(void)
}
total_lowmem = total_memory = lmb_end_of_DRAM() - memstart_addr;
+ lowmem_end_addr = memstart_addr + total_lowmem;
#ifdef CONFIG_FSL_BOOKE
/* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
@@ -156,9 +157,10 @@ void __init MMU_init(void)
if (total_lowmem > __max_low_memory) {
total_lowmem = __max_low_memory;
+ lowmem_end_addr = memstart_addr + total_lowmem;
#ifndef CONFIG_HIGHMEM
total_memory = total_lowmem;
- lmb_enforce_memory_limit(total_lowmem);
+ lmb_enforce_memory_limit(lowmem_end_addr);
lmb_analyze();
#endif /* CONFIG_HIGHMEM */
}
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