Merge patch series "memblock tests: fix BUILD=32 address conversions and warnings"

Tianyi Chen <hi@tychen.cc> says:

memblock tests: fix BUILD=32 address conversions and warnings

Fix the BUILD=32 physical-address truncation and sign-extension failures,
and address the remaining GCC warnings reported during review.

Validated with GCC 13.3.0 and Clang 18.1.3, retaining the default ASan
and UBSan flags and adding -Werror. Both compilers build without warnings
and pass ./main -v and ./main -m -v in each configuration:
- Default and NUMA=1.
- BUILD=32, with and without NUMA=1.
- 32BIT_PHYS_ADDR_T=1, with and without NUMA=1.
- BUILD=32 NUMA=1 MEMBLOCK_DEBUG=1.

Each run passes 189 checks without NUMA or 272 with NUMA, including both
allocation directions. A separate virt_to_phys() boundary check passes
with both compilers in 32- and 64-bit builds; GCC BUILD=32 failed it on
v1 for 0x80000000 due to sign extension.

* patches from https://patch.msgid.link/20260923023126.1910311-1-hi@tychen.cc
  memblock tests: use physical addresses for region removal
  memblock tests: zero-extend simulated memory addresses
  tools: use __pa() in virt_to_phys()
  memblock: initialize the region merge end index

Link: https://patch.msgid.link/20260923023126.1910311-1-hi@tychen.cc
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

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