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| author | Tianyi Chen <hi@tychen.cc> | 2026-09-10 07:55:28 +0800 |
|---|---|---|
| committer | Mike Rapoport (Microsoft) <rppt@kernel.org> | 2026-09-10 13:10:20 +0300 |
| commit | f68c01000a6c3bddbf415b6e50a201196ec78358 (patch) | |
| tree | 6008f488bac9acfb7479de980fea305defac0ff5 | |
| parent | 6e33dc90df108c76899dc544a42d17adcba61668 (diff) | |
| download | linux-next-f68c01000a6c3bddbf415b6e50a201196ec78358.tar.gz linux-next-f68c01000a6c3bddbf415b6e50a201196ec78358.zip | |
memblock tests: model the low allocation limit within dummy memory
The simulator represents physical addresses using the address of its
allocated buffer. That buffer can lie above the default
ARCH_LOW_ADDRESS_LIMIT, preventing meaningful memblock_alloc_low()
tests.
Use the architecture override in asm/dma.h to place the limit halfway
through the memory registered by setup_memblock(). Resolve the limit
after allocating the buffer, leaving registered memory on both sides.
Assisted-by: LLM
Signed-off-by: Tianyi Chen <hi@tychen.cc>
Link: https://patch.msgid.link/f16c272cd52316b83c35d87987b4d8687c4a3182.1788997523.git.hi@tychen.cc
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
| -rw-r--r-- | tools/testing/memblock/asm/dma.h | 6 | ||||
| -rw-r--r-- | tools/testing/memblock/tests/common.c | 6 |
2 files changed, 12 insertions, 0 deletions
diff --git a/tools/testing/memblock/asm/dma.h b/tools/testing/memblock/asm/dma.h index 13ff8e5d22ef..6607408dcf25 100644 --- a/tools/testing/memblock/asm/dma.h +++ b/tools/testing/memblock/asm/dma.h @@ -2,4 +2,10 @@ #ifndef _TOOLS_DMA_H #define _TOOLS_DMA_H +#include <linux/types.h> + +phys_addr_t dummy_physical_memory_low_limit(void); + +#define ARCH_LOW_ADDRESS_LIMIT dummy_physical_memory_low_limit() + #endif diff --git a/tools/testing/memblock/tests/common.c b/tools/testing/memblock/tests/common.c index 3250c8e5124b..ac032610a56e 100644 --- a/tools/testing/memblock/tests/common.c +++ b/tools/testing/memblock/tests/common.c @@ -118,6 +118,12 @@ phys_addr_t dummy_physical_memory_base(void) return (phys_addr_t)memory_block.base; } +phys_addr_t dummy_physical_memory_low_limit(void) +{ + /* The low limit is halfway through memory registered by setup_memblock(). */ + return dummy_physical_memory_base() + MEM_SIZE / 2; +} + static void usage(const char *prog) { BUILD_BUG_ON(ARRAY_SIZE(help_opts) != ARRAY_SIZE(long_opts) - 1); |