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arm64: Add FIX_HOLE to permanent fixed addresses

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Every other architecture with permanent fixed addresses has
FIX_HOLE as the first entry. This seems to be designed as a
debugging aid but there are a couple of side effects of not
having FIX_HOLE:

- If the first fixed address is 0, fix_to_virt -> virt_to_fix
triggers a BUG_ON for the virtual address being equal to
FIXADDR_TOP
- fix_to_virt may return a value outside of FIXADDR_START
and FIXADDR_TOP which may look like a bug to a developer.

Match up with other architectures and make everything clearer
by adding FIX_HOLE.

Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Laura Abbott 2014-11-26 00:14:16 +00:00 committed by Will Deacon
parent c9453a3ab1
commit dab78b6dcb
1 changed files with 1 additions and 0 deletions
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1
arch/arm64/include/asm/fixmap.h
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@ -31,6 +31,7 @@
*
*/
enum fixed_addresses {
FIX_HOLE,
FIX_EARLYCON_MEM_BASE,
__end_of_permanent_fixed_addresses,