VMALLOC_END definition?

[Heiko Carstens <heiko.carstens@de.ibm.com>]

Hi,

I just stumbled across the VMALLOC_END definition: I'm not entirely sure
what the meaning of this is: is it the last _valid_ address of the
vmalloc area or is it the first address _after_ the vmalloc area?

Reading the code in mm/vmalloc.c it seems to be the last valid address,
which IMHO is the only thing that makes sense... how would one express
the first address after 0xffffffff on a 32bit architecture?
Whatever it is, it looks like half of the architectures got it wrong.

We have a lot of these:

e.g. powerpc:
#define VMALLOC_START ASM_CONST(0xD000000000000000)
#define VMALLOC_SIZE  ASM_CONST(0x80000000000)
#define VMALLOC_END   (VMALLOC_START + VMALLOC_SIZE)

but also a lot of these:

e.g. x86_64

#define VMALLOC_START    0xffffc20000000000UL
#define VMALLOC_END      0xffffe1ffffffffffUL

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