linux-kernel - bug report for linux-6.14/tools/testing/selftests/mm/pagemap

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Message-ID:
 <AS8PR02MB10217315060BBFDB21F19643E9CA62@AS8PR02MB10217.eurprd02.prod.outlook.com>
Date: Wed, 26 Mar 2025 19:25:57 +0000
From: David Binderman <dcb314@...mail.com>
To: "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"shuah@...nel.org" <shuah@...nel.org>, "linux-mm@...ck.org"
	<linux-mm@...ck.org>, "linux-kselftest@...r.kernel.org"
	<linux-kselftest@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: bug report for linux-6.14/tools/testing/selftests/mm/pagemap_ioctl.c

Hello there,

Static analyser cppcheck says:

> linux-6.14/tools/testing/selftests/mm/pagemap_ioctl.c:1061:11: style: int result is assigned to long long variable. If the variable is long long to avoid loss of information, then you have loss of information. [truncLongCastAssignment]
> linux-6.14/tools/testing/selftests/mm/pagemap_ioctl.c:1510:11: style: int result is assigned to long long variable. If the variable is long long to avoid loss of information, then you have loss of information. [truncLongCastAssignment]
> linux-6.14/tools/testing/selftests/mm/pagemap_ioctl.c:1523:11: style: int result is assigned to long long variable. If the variable is long long to avoid loss of information, then you have loss of information. [truncLongCastAssignment]
> linux-6.14/tools/testing/selftests/mm/pagemap_ioctl.c:247:11: style: int result is assigned to long long variable. If the variable is long long to avoid loss of information, then you have loss of information. [truncLongCastAssignment]
> linux-6.14/tools/testing/selftests/mm/pagemap_ioctl.c:435:11: style: int result is assigned to long long variable. If the variable is long long to avoid loss of information, then you have loss of information. [truncLongCastAssignment]
> linux-6.14/tools/testing/selftests/mm/pagemap_ioctl.c:490:11: style: int result is assigned to long long variable. If the variable is long long to avoid loss of information, then you have loss of information. [truncLongCastAssignment]

The source code of the first one is

    mem_size = 10 * page_size;

Maybe better code:

    mem_size = 10ULL * page_size;

Regards

David Binderman