diff options
| author | Kumar Gala <galak@kernel.crashing.org> | 2008-04-16 05:52:22 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-04-17 07:46:13 +1000 |
| commit | d7917ba7051e3fd12ebe2d5a09b29fb3a2b38190 (patch) | |
| tree | 339d273aee5eb2cb83e226945f0319b51f4bdf3c /arch/powerpc/mm/mmu_decl.h | |
| parent | 99c62dd773797b68f3b1ca6bb3274725d1852fa2 (diff) | |
[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/mmu_decl.h')
| -rw-r--r-- | arch/powerpc/mm/mmu_decl.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h index 5bc11f5933a9..67477e772958 100644 --- a/arch/powerpc/mm/mmu_decl.h +++ b/arch/powerpc/mm/mmu_decl.h @@ -52,6 +52,7 @@ extern unsigned long __initial_memory_limit; extern unsigned long total_memory; extern unsigned long total_lowmem; extern phys_addr_t memstart_addr; +extern phys_addr_t lowmem_end_addr; /* ...and now those things that may be slightly different between processor * architectures. -- Dan |