ptr_compress: fix build for Arm v7

Fix the type of offset to use portable uintptr_t instead of uint64_t.

Fixes: 077596a4b077 ("ptr_compress: add pointer compression library")

Reported-by: Luca Boc

ptr_compress: fix build for Arm v7

Fix the type of offset to use portable uintptr_t instead of uint64_t.

Fixes: 077596a4b077 ("ptr_compress: add pointer compression library")

Reported-by: Luca Boccassi <bluca@debian.org>
Signed-off-by: Paul Szczepanek <paul.szczepanek@arm.com>
Reviewed-by: Nick Connolly <nick.connolly@arm.com>
Tested-by: Luca Vizzarro <luca.vizzarro@arm.com>

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ptr_compress: add pointer compression library

Add a new utility header for compressing pointers. The provided
functions can store pointers as 32-bit or 16-bit offsets.

The compression takes advanta

ptr_compress: add pointer compression library

Add a new utility header for compressing pointers. The provided
functions can store pointers as 32-bit or 16-bit offsets.

The compression takes advantage of the fact that pointers are
usually located in a limited memory region (like a mempool).
We can compress them by converting them to offsets from a base
memory address. Offsets can be stored in fewer bytes (dictated
by the memory region size and alignment of the pointer).
For example: an 8 byte aligned pointer which is part of a 32GB
memory pool can be stored in 4 bytes.

Suggested-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Signed-off-by: Paul Szczepanek <paul.szczepanek@arm.com>
Signed-off-by: Kamalakshitha Aligeri <kamalakshitha.aligeri@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Nathan Brown <nathan.brown@arm.com>
Reviewed-by: Jack Bond-Preston <jack.bond-preston@foss.arm.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>

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