From patchwork Tue May 21 07:43:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dev Jain X-Patchwork-Id: 13668970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id F16EB524DA; Tue, 21 May 2024 07:44:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716277465; cv=none; b=s3ChEOvtshQHBHbUzrMFMy2SVqYAisCKQb2k2kKTroawQFPlIosJ8SC6dSoV7eztUdKz55H2AWVwgF+WfsHH2U13hIjQMcJ+RAOJ39q7VO2DqUnlCI4cqqL1jeMnfBY+qHjfxS3exQBkCQCTq7vp+fUglQjiiI0pDHsYJ49vnBk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716277465; c=relaxed/simple; bh=Lg0/Tt1SOS/F7tOaSVGCmlbI8p0YWMpg6DSqNS8Dvpw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=riLsPI0JuORtsWsUxwSFykHRQqAQHb7oax1zWsPOOzN0dPmEwJHDx5yXXhIfE2jkdfXcorE1jvzqYygSKYM2Xywv3epdlMy3Nt9WwbCG/WkW44UcpIb9mP3BeC3iB7dEw+Nzo11TXJd6FdKtWWFD5Ij9arbsr7WFEZYzYwy9Gw8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4435CFEC; Tue, 21 May 2024 00:44:47 -0700 (PDT) Received: from e116581.blr.arm.com (e116581.arm.com [10.162.42.16]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id DB03C3F641; Tue, 21 May 2024 00:44:19 -0700 (PDT) From: Dev Jain To: akpm@linux-foundation.org, shuah@kernel.org Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Anshuman.Khandual@arm.com, sjayaram@akamai.com, Dev Jain , stable@vger.kernel.org Subject: [PATCH v2 1/3] selftests/mm: compaction_test: Fix bogus test success on Aarch64 Date: Tue, 21 May 2024 13:13:56 +0530 Message-Id: <20240521074358.675031-2-dev.jain@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240521074358.675031-1-dev.jain@arm.com> References: <20240521074358.675031-1-dev.jain@arm.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Currently, if at runtime we are not able to allocate a huge page, the test will trivially pass on Aarch64 due to no exception being raised on division by zero while computing compaction_index. Fix that by checking for nr_hugepages == 0. Anyways, in general, avoid a division by zero by exiting the program beforehand. While at it, fix a typo, and handle the case where the number of hugepages may overflow an integer. Changes in v2: - Combine with this series, handle unsigned long number of hugepages v1: - https://lore.kernel.org/all/20240513082842.4117782-1-dev.jain@arm.com/ Fixes: bd67d5c15cc1 ("Test compaction of mlocked memory") Cc: stable@vger.kernel.org Signed-off-by: Dev Jain --- tools/testing/selftests/mm/compaction_test.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/tools/testing/selftests/mm/compaction_test.c b/tools/testing/selftests/mm/compaction_test.c index 4f42eb7d7636..0b249a06a60b 100644 --- a/tools/testing/selftests/mm/compaction_test.c +++ b/tools/testing/selftests/mm/compaction_test.c @@ -82,12 +82,13 @@ int prereq(void) return -1; } -int check_compaction(unsigned long mem_free, unsigned int hugepage_size) +int check_compaction(unsigned long mem_free, unsigned long hugepage_size) { + unsigned long nr_hugepages_ul; int fd, ret = -1; int compaction_index = 0; - char initial_nr_hugepages[10] = {0}; - char nr_hugepages[10] = {0}; + char initial_nr_hugepages[20] = {0}; + char nr_hugepages[20] = {0}; /* We want to test with 80% of available memory. Else, OOM killer comes in to play */ @@ -134,7 +135,12 @@ int check_compaction(unsigned long mem_free, unsigned int hugepage_size) /* We should have been able to request at least 1/3 rd of the memory in huge pages */ - compaction_index = mem_free/(atoi(nr_hugepages) * hugepage_size); + nr_hugepages_ul = strtoul(nr_hugepages, NULL, 10); + if (!nr_hugepages_ul) { + ksft_print_msg("ERROR: No memory is available as huge pages\n"); + goto close_fd; + } + compaction_index = mem_free/(nr_hugepages_ul * hugepage_size); lseek(fd, 0, SEEK_SET); @@ -145,11 +151,11 @@ int check_compaction(unsigned long mem_free, unsigned int hugepage_size) goto close_fd; } - ksft_print_msg("Number of huge pages allocated = %d\n", - atoi(nr_hugepages)); + ksft_print_msg("Number of huge pages allocated = %lu\n", + nr_hugepages_ul); if (compaction_index > 3) { - ksft_print_msg("ERROR: Less that 1/%d of memory is available\n" + ksft_print_msg("ERROR: Less than 1/%d of memory is available\n" "as huge pages\n", compaction_index); goto close_fd; }