From 46cb11b17c7a917e0eb5c7aa87a7bc6cda455a5e Mon Sep 17 00:00:00 2001 From: Andre Przywara Date: Fri, 19 Mar 2021 16:53:27 +0000 Subject: [PATCH] kselftest/arm64: mte: user_mem: Fix write() warning Out of the box Ubuntu's 20.04 compiler warns about missing return value checks for write() (sys)calls. Make GCC happy by checking whether we actually managed to write "val". Signed-off-by: Andre Przywara Reviewed-by: Mark Brown Link: https://lore.kernel.org/r/20210319165334.29213-5-andre.przywara@arm.com Signed-off-by: Catalin Marinas --- tools/testing/selftests/arm64/mte/check_user_mem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/arm64/mte/check_user_mem.c b/tools/testing/selftests/arm64/mte/check_user_mem.c index 4bfa80f2a8c3..1de7a0abd0ae 100644 --- a/tools/testing/selftests/arm64/mte/check_user_mem.c +++ b/tools/testing/selftests/arm64/mte/check_user_mem.c @@ -33,7 +33,8 @@ static int check_usermem_access_fault(int mem_type, int mode, int mapping) if (fd == -1) return KSFT_FAIL; for (i = 0; i < len; i++) - write(fd, &val, sizeof(val)); + if (write(fd, &val, sizeof(val)) != sizeof(val)) + return KSFT_FAIL; lseek(fd, 0, 0); ptr = mte_allocate_memory(len, mem_type, mapping, true); if (check_allocated_memory(ptr, len, mem_type, true) != KSFT_PASS) {