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>> + >> + for (node = 0; node <= numa_max_node(); node++) { >> + if (numa_node_size(node, NULL) > 0) >> + count++; >> + } >> + >> + return count; >> +} >> + > > Can we instead build upon our existing helpers get_first_mem_node() + > get_next_mem_node() ? > > From 432774fb50237519c1c041e402fddfdf4b35aa2c Mon Sep 17 00:00:00 2001 > From: "David Hildenbrand (Arm)" > Date: Fri, 26 Jun 2026 17:52:21 +0200 > Subject: [PATCH] tmp > > Signed-off-by: David Hildenbrand (Arm) > --- > tools/testing/selftests/mm/ksm_tests.c | 16 +++++++++------- > 1 file changed, 9 insertions(+), 7 deletions(-) > > diff --git a/tools/testing/selftests/mm/ksm_tests.c b/tools/testing/selftests/mm/ksm_tests.c > index a050f4840cfa3..2ebbb544c6711 100644 > --- a/tools/testing/selftests/mm/ksm_tests.c > +++ b/tools/testing/selftests/mm/ksm_tests.c > @@ -440,9 +440,9 @@ static int get_next_mem_node(int node) > mem_node = i % (max_node + 1); > node_size = numa_node_size(mem_node, NULL); > if (node_size > 0) > - break; > + return mem_node; > } > - return mem_node; > + return -ENODEV; > } > > static int get_first_mem_node(void) > @@ -455,8 +455,8 @@ static int check_ksm_numa_merge(int merge_type, int mapping, int prot, int timeo > { > void *numa1_map_ptr, *numa2_map_ptr; > struct timespec start_time; > + int first_node, second_node; > int page_count = 2; > - int first_node; > > if (clock_gettime(CLOCK_MONOTONIC_RAW, &start_time)) { > ksft_perror("clock_gettime"); > @@ -467,17 +467,19 @@ static int check_ksm_numa_merge(int merge_type, int mapping, int prot, int timeo > ksft_print_msg("NUMA support not enabled\n"); > return KSFT_SKIP; > } > - if (numa_num_configured_nodes() <= 1) { > - ksft_print_msg("At least 2 NUMA nodes must be available\n"); > + first_node = get_first_mem_node(); > + second_node = get_next_mem_node(first_node); > + > + if (second_node < 0) { > + ksft_print_msg("At least 2 NUMA nodes with memory must be available\n"); > return KSFT_SKIP; > } > if (ksm_write_sysfs(KSM_FP("merge_across_nodes"), merge_across_nodes)) > return KSFT_FAIL; > > /* allocate 2 pages in 2 different NUMA nodes and fill them with the same data */ > - first_node = get_first_mem_node(); > numa1_map_ptr = numa_alloc_onnode(page_size, first_node); > - numa2_map_ptr = numa_alloc_onnode(page_size, get_next_mem_node(first_node)); > + numa2_map_ptr = numa_alloc_onnode(page_size, second_node); > if (!numa1_map_ptr || !numa2_map_ptr) { > ksft_perror("numa_alloc_onnode"); > return KSFT_FAIL; Hi David, Thanks for review! Yes, I updated the implementation in v2 to use the existing get_first_mem_node() + get_next_mem_node() helper as suggested. V2:https://lore.kernel.org/all/878cbc1dd24921d55049932dcd5fd6ee517557ca.1782811071.git.sayalip@linux.ibm.com/