On 12 Mar 2026, at 7:40, Chunyu Hu wrote: > When thp is not enabled on some kernel config such as realtime kernel, the > test will report failure. Fix the false positive by skipping the test > directly when thp is not enabled. > > There's a naming conflict on write_file() function, both thp_settings.h and > split_huge_page_test.c define it. To make use of thp_is_enabled() helper in > the thp_settings.h, rename this local write_file to safe_write_file to > avoid the conflict. The reason to use 'safe_' is it does some error check.
Both write_file() do safe checks. Actually the code of both functions looks almost identical except that the thp_settings one does exit() instead of ksft_exit_fail_msg(). Can you rename the split_huge_page_test’s write_file() to write_file_local() and add a comment above the function like /* add _local to avoid a function conflict with thp_settings.h */? With that, feel free to add: Reviewed-by: Zi Yan <[email protected]> Thanks. > > Tested with thp disabled kernel: > Before The fix: > # -------------------------------------------------- > # running ./split_huge_page_test /tmp/xfs_dir_Ywup9p > # -------------------------------------------------- > # TAP version 13 > # Bail out! Reading PMD pagesize failed > # # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0 > # [FAIL] > not ok 61 split_huge_page_test /tmp/xfs_dir_Ywup9p # exit=1 > > After the fix: > # -------------------------------------------------- > # running ./split_huge_page_test /tmp/xfs_dir_YHPUPl > # -------------------------------------------------- > # TAP version 13 > # 1..0 # SKIP Transparent Hugepages not available > # [SKIP] > ok 6 split_huge_page_test /tmp/xfs_dir_YHPUPl # SKIP > > CC: Li Wang <[email protected]> > Signed-off-by: Chunyu Hu <[email protected]> > --- > tools/testing/selftests/mm/split_huge_page_test.c | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > > diff --git a/tools/testing/selftests/mm/split_huge_page_test.c > b/tools/testing/selftests/mm/split_huge_page_test.c > index e0167111bdd1..615b75ca62cc 100644 > --- a/tools/testing/selftests/mm/split_huge_page_test.c > +++ b/tools/testing/selftests/mm/split_huge_page_test.c > @@ -21,6 +21,7 @@ > #include <time.h> > #include "vm_util.h" > #include "kselftest.h" > +#include "thp_settings.h" > > uint64_t pagesize; > unsigned int pageshift; > @@ -255,7 +256,7 @@ static int check_after_split_folio_orders(char > *vaddr_start, size_t len, > return status; > } > > -static void write_file(const char *path, const char *buf, size_t buflen) > +static void safe_write_file(const char *path, const char *buf, size_t buflen) > { > int fd; > ssize_t numwritten; > @@ -283,7 +284,7 @@ static void write_debugfs(const char *fmt, ...) > if (ret >= INPUT_MAX) > ksft_exit_fail_msg("%s: Debugfs input is too long\n", __func__); > > - write_file(SPLIT_DEBUGFS, input, ret + 1); > + safe_write_file(SPLIT_DEBUGFS, input, ret + 1); > } > > static char *allocate_zero_filled_hugepage(size_t len) > @@ -772,6 +773,10 @@ int main(int argc, char **argv) > ksft_finished(); > } > > + if (!thp_is_enabled()) { > + ksft_exit_skip("Transparent Hugepages not available\n"); > + } > + > if (argc > 1) > optional_xfs_path = argv[1]; > > -- > 2.53.0 Best Regards, Yan, Zi
