From patchwork Tue May 21 07:43:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dev Jain X-Patchwork-Id: 13668971 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id CB0C054BF9; Tue, 21 May 2024 07:44:27 +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=1716277469; cv=none; b=CBqhMX12nRLjU00140O/MLRUdiHOOp9P55pnnfGjj8iM0mDPl0Zo3Mtn0ESYsmrrr/BALbVQwV35x0npmPLQnXOL8wFCYbNV+KNYsy+8S9j780rFM9LwtDbKbzeQu6Q5Wa9T7sKeuV32r7ZNMOHnGqqVW7p1NCUi1iD5fukASrY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716277469; c=relaxed/simple; bh=xKqQVYkhRL27RMTPPCwMLzIsuRzhGjGhpC6rViWWAso=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=SMPpS1XF4UrD6Yz/W3ej1xQw2ee8klxbx22aOxKSIeoBu4JHw6fTL+QgVJN58sq+9ddsO4AtBKrphZgilkYu/tvn8p4iqg7qaQqGqMU2B7pRwSbm4uDh+d9ksMGbua/wI0dqB2xiaAINCHNEcgcl6z1yGS/ROLzFSf6snoenZ2s= 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 2D4CB1042; Tue, 21 May 2024 00:44:51 -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 D9DDD3F641; Tue, 21 May 2024 00:44:23 -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 2/3] selftests/mm: compaction_test: Fix incorrect write of zero to nr_hugepages Date: Tue, 21 May 2024 13:13:57 +0530 Message-Id: <20240521074358.675031-3-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, the test tries to set nr_hugepages to zero, but that is not actually done because the file offset is not reset after read(). Fix that using lseek(). Fixes: bd67d5c15cc1 ("Test compaction of mlocked memory") Cc: stable@vger.kernel.org Signed-off-by: Dev Jain --- tools/testing/selftests/mm/compaction_test.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/testing/selftests/mm/compaction_test.c b/tools/testing/selftests/mm/compaction_test.c index 0b249a06a60b..5e9bd1da9370 100644 --- a/tools/testing/selftests/mm/compaction_test.c +++ b/tools/testing/selftests/mm/compaction_test.c @@ -108,6 +108,8 @@ int check_compaction(unsigned long mem_free, unsigned long hugepage_size) goto close_fd; } + lseek(fd, 0, SEEK_SET); + /* Start with the initial condition of 0 huge pages*/ if (write(fd, "0", sizeof(char)) != sizeof(char)) { ksft_print_msg("Failed to write 0 to /proc/sys/vm/nr_hugepages: %s\n",