tools/mm/thp_swap_allocator_test: fix small folio alignment

Use ALIGNMENT_SMALLFOLIO instead of ALIGNMENT_MTHP when allocating small
folios to ensure correct memory alignment for the test case.

Before: test allocates small folios with 64KB alignment
(ALIGNMENT_MTHP) when only 4KB alignment (ALIGNMENT_SMALLFOLIO) is
needed.  This wastes address space and may cause allocation failures on
systems with fragmented memory.

Worst-case impact: this only affects thp_swap_allocator_test tool
behavior.

Link: https://lkml.kernel.org/r/20251209031745.2723120-1-kaushlendra.kumar@intel.com
Signed-off-by: Kaushlendra Kumar <kaushlendra.kumar@intel.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/tools/mm/thp_swap_allocator_test.c b/tools/mm/thp_swap_allocator_test.c
index 83afc52275a501c766b5fa42cb189f6dae282501..d4434df3dcffdc2fa0d14babe56c3847616241d4 100644 (file)
--- a/tools/mm/thp_swap_allocator_test.c
+++ b/tools/mm/thp_swap_allocator_test.c
@@ -142,7 +142,7 @@ int main(int argc, char *argv[])
        }
 
        if (use_small_folio) {
-               mem2 = aligned_alloc_mem(MEMSIZE_SMALLFOLIO, ALIGNMENT_MTHP);
+               mem2 = aligned_alloc_mem(MEMSIZE_SMALLFOLIO, ALIGNMENT_SMALLFOLIO);
                if (mem2 == NULL) {
                        fprintf(stderr, "Failed to allocate small folios memory\n");
                        free(mem1);