[PATCH 2/2] memblock tests: zero-extend simulated memory addresses

[Tianyi Chen <hi@tychen.cc>]

Converting a 32-bit pointer directly to the 64-bit phys_addr_t can
sign-extend it when BUILD=32 is used. A dummy allocation above 2 GiB
then gets registered at an address different from its unsigned pointer
value. The low-address tests compare that value against the registered
range and fail once the earlier maximum-address free test is fixed.

Convert through uintptr_t when registering and reporting dummy memory.
This preserves the pointer bits and agrees with the simulator __pa()
conversion and the allocation tests.

Fixes: 284d950dd6b0 ("memblock tests: Add simulation of physical memory")
Assisted-by: LLM
Signed-off-by: Tianyi Chen <hi@tychen.cc>
---
 tools/testing/memblock/tests/common.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/memblock/tests/common.c b/tools/testing/memblock/tests/common.c
index ac032610a56e..2a248973eb4c 100644
--- a/tools/testing/memblock/tests/common.c
+++ b/tools/testing/memblock/tests/common.c
@@ -67,7 +67,7 @@ static inline void fill_memblock(void)
 void setup_memblock(void)
 {
 	reset_memblock_regions();
-	memblock_add((phys_addr_t)memory_block.base, MEM_SIZE);
+	memblock_add((phys_addr_t)(uintptr_t)memory_block.base, MEM_SIZE);
 	fill_memblock();
 }
 
@@ -88,7 +88,7 @@ void setup_numa_memblock(const unsigned int node_fracs[])
 	int flags;
 
 	reset_memblock_regions();
-	base = (phys_addr_t)memory_block.base;
+	base = (phys_addr_t)(uintptr_t)memory_block.base;
 	flags = (movable_node_is_enabled()) ? MEMBLOCK_NONE : MEMBLOCK_HOTPLUG;
 
 	for (int i = 0; i < NUMA_NODES; i++) {
@@ -115,7 +115,7 @@ void dummy_physical_memory_cleanup(void)
 
 phys_addr_t dummy_physical_memory_base(void)
 {
-	return (phys_addr_t)memory_block.base;
+	return (phys_addr_t)(uintptr_t)memory_block.base;
 }
 
 phys_addr_t dummy_physical_memory_low_limit(void)
-- 
2.55.0