From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A726C4B95A3; Tue, 13 Oct 2026 10:37:22 +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=1791887844; cv=none; b=kqxiEWWtY7HxSjh63rMFQDGg3WtzTz9zqmG+OLBvjw7tL22mkSXnUfEK7vrqzztploXse/GkXSK+XK/eHDmlPniIioEwtYsUFEz7KaSwJq0PV/L6XmEL/SSB7FQkYkFtGwKiMLowZPC8spQTXqVJyUAQks5oyIigM/z2dzHx1Hw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791887844; c=relaxed/simple; bh=zlm0jggjoGcBtjF+7NJSkqsks8KqRwYRxYBdaXI2m88=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Z3BknPT8MIgHM9fNTVCcibOssWHI1xYEQULCljPKckJNl2QNDBdiL94YrXVagES7UhADtVar444fVSoqnUPInldeS26ZL85DNlVmkEovJfKnoB4jsdQYRXp82OzeUbjqDbXGhHfhvIljoQsL4RP0H+Z6q32FjADpeOXmJtMWrQc= 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; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=O7lRj9VX; 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 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="O7lRj9VX" 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 8F40C169C; Tue, 13 Oct 2026 03:37:18 -0700 (PDT) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id DA5DB3F7B4; Tue, 13 Oct 2026 03:37:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1791887841; bh=zlm0jggjoGcBtjF+7NJSkqsks8KqRwYRxYBdaXI2m88=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=O7lRj9VXE8HhrWghHpCesoTCpOa3V7aRgApIrDvh+G4vpyN9kUBHcyI1lhxEtlw94 YUPHx70ypb3+oZ3nDuN/z5PzeGIa7O99Yd+lDTkwjvJYuAoecmMhhrDMAqriWnlMcO cb1EBGw0sasp4JyHpGH461ycQ4qUAKK37LhSSLrA= From: Yeoreum Yun Date: Tue, 13 Oct 2026 11:37:05 +0100 Subject: [PATCH v7 3/3] kselftest: mm: introduce size_to_shift() helper Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261013-fix_hpage_macro-v7-3-3d77129e0557@arm.com> References: <20261013-fix_hpage_macro-v7-0-3d77129e0557@arm.com> In-Reply-To: <20261013-fix_hpage_macro-v7-0-3d77129e0557@arm.com> To: Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Peter Xu , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Andrew Morton , David Hildenbrand , Shuah Khan , Jason Gunthorpe , Leon Romanovsky , Sarthak Sharma , Yeoreum Yun X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1845; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=zlm0jggjoGcBtjF+7NJSkqsks8KqRwYRxYBdaXI2m88=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqzgnUGsz8VkHf3mY2KQbmGhgbZWDJCNsolUO8H 01cPlR84VSJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCas4J1AAKCRBt1cPRWsUx M1/MDACQ/yPt492mMgEomDBdxPrbfqQ8emxOnCQeHS79ptrnJWB8D6IXBWsMkDP0lKCYRTT/L07 S5bPI/4B1oGOnQceTWPNgKijv32hLXOHE41QxS6HAx3oYYygOg76qW+uO/1pbAkPtqUAxj+7o+T yLY75ASTUOQP6MEl3McNffBU8TC9SSxfYYgQ0IO/u0fEqLx2StFMzW98W1nYqf0FlnOTtBV0Up1 oE2dG2DXcM7RZe1jKWhV3Vp7l0Ar3GasLmWro80gjUQisxsUt3vlIhITqZSB47GNd5ZrnTR4M05 +GqBhtoa6l/kd2OT1CwBWxyyJ27coDJXxXsT6apbS6ftJQcFjmrA8eLY/0XFCMT6FLTWbmeRVU2 wnoo25/qOJWZK7U/lkkkarU5JKgkkNOTzR3EB97SZq9I9my7tWxx7Gz7XFEn2IhwTPAAz2cBS8l SLO0CfhTgIgiRnxYEoblMZ4q9Cm9J40+T2+/Ik6jYuA2g5TMnMeNhzk+vr2n4RjZ2Wlnk= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 Introduce size_to_shift() for future users that need to obtain shift of a huge-page which is other than pmd_psize(). Suggested-by: David Hildenbrand (Arm) Tested-by: Sarthak Sharma Reviewed-by: Lorenzo Stoakes (ARM) Reviewed-by: Sarthak Sharma Acked-by: Mike Rapoport (Microsoft) Signed-off-by: Yeoreum Yun --- tools/testing/selftests/mm/vm_util.c | 2 +- tools/testing/selftests/mm/vm_util.h | 12 ++++++++++++ 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c index 3b42cbdec7a2f..8ef226107d788 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -194,7 +194,7 @@ uint64_t pmd_pshift(void) if (__pmd_psize == -1ull) __pmd_psize = pmd_psize(); - __pmd_pshift = (__pmd_psize > 0) ? ffsl(__pmd_psize) - 1 : 0; + __pmd_pshift = size_to_shift(__pmd_psize); return __pmd_pshift; } diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h index ff51c61636505..67ff4bba5707a 100644 --- a/tools/testing/selftests/mm/vm_util.h +++ b/tools/testing/selftests/mm/vm_util.h @@ -159,6 +159,18 @@ static inline int sz2ord(size_t size, size_t pagesize) return __builtin_ctzll(size / pagesize); } +static inline uint64_t size_to_shift(uint64_t size) +{ + /* + * The function returns the corresponding shift only when the size + * is a power of two; otherwise, it returns 0. + */ + if (!size || (size & (size - 1))) + return 0; + + return ffsl(size) - 1; +} + void *sys_mremap(void *old_address, unsigned long old_size, unsigned long new_size, int flags, void *new_address); -- 2.43.0