mmap() returns MAP_FAILED on error, not NULL. The current check uses !buffer->ptr, which evaluates to false when mmap() fails (since MAP_FAILED is (void *)-1, not 0), so the error path is never taken.
Signed-off-by: Hongfu Li <[email protected]> --- tools/testing/selftests/mm/hmm-tests.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/hmm-tests.c b/tools/testing/selftests/mm/hmm-tests.c index 788689497e92..d72adba5c74e 100644 --- a/tools/testing/selftests/mm/hmm-tests.c +++ b/tools/testing/selftests/mm/hmm-tests.c @@ -2688,7 +2688,7 @@ static inline int run_migration_benchmark(int fd, int use_thp, size_t buffer_siz buffer->ptr = mmap(NULL, buffer_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - if (!buffer->ptr) + if (buffer->ptr == MAP_FAILED) return -1; /* Apply THP hint if requested */ -- 2.25.1
