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 DB19F31B83B; Fri, 9 Oct 2026 01:27:53 +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=1791509275; cv=none; b=n1KIbd6fgKzg1+Nmcqf5GJ0sbmxsKyuB6mNH7Y6UxXVZUtRHkRHkrwmKy6dU7QYRhukfC93Y5XT4bPGZ27EhQrR0XiuttcWk3EGxE9VUoW5OFrABqhdxqhkcbdBgt7iRcB92sygESH5Mx1q9JX897XLifX0pMNJSTLT/aKVR4Bw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791509275; c=relaxed/simple; bh=BW4kltP6qsGC0wjesYshCGa9/T+akVq8hlsP2xOsRGI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ZNYQjaIQ+vUU3fqnTpqPaTJ0sxswxH1Tc8tdxoLK9/BBKl9WuTbMjlVwWUK+f2Qk3Q/h7mucEGeNXI0yzgJ3pHQQJyWoGmrGn9T8FpQKQq58dcHaLVpF0ZOVibzVds4Q7RPrOnK2Pmax/8lrbmr/0Out1QVxmlRZ5g3LKa406+g= 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=ncdaZH26; 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="ncdaZH26" 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 C5792175D; Thu, 8 Oct 2026 18:27:49 -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 90BB43F8C6; Thu, 8 Oct 2026 18:27:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1791509273; bh=BW4kltP6qsGC0wjesYshCGa9/T+akVq8hlsP2xOsRGI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=ncdaZH263eQQpKoPp+9vY77MP1zD6+8LZnmJQSva/40XRIR0Z3+m5zmPTBRyJNJrr +S933lE/Uh743ldsoDN3KIMzQY5f1a/xBv9jI94BLBZrDBzat2Px/HjKIbQN2uqML4 iHZk7QVbpt3w4KhaD4p31/lid8nL3ONyyBvgBUlw= From: Yeoreum Yun Date: Fri, 09 Oct 2026 02:27:34 +0100 Subject: [PATCH v5 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: <20261009-fix_hpage_macro-v5-3-54378ae45add@arm.com> References: <20261009-fix_hpage_macro-v5-0-54378ae45add@arm.com> In-Reply-To: <20261009-fix_hpage_macro-v5-0-54378ae45add@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=1684; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=BW4kltP6qsGC0wjesYshCGa9/T+akVq8hlsP2xOsRGI=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqyEMJkxuAyamllnil5Dcw8F4xoHUrxiEbWhjSc O38qC/mMyOJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCashDCQAKCRBt1cPRWsUx M8bmC/9KLjWP7sj7aB73kK9gXumDcMHmbkTe4jg10tXLQdfS4O4oZKH5hZDix5sKKY8o3NmB0DF zL/p5ZuiBX6Irad0kSqZax6XfhaIX0bDE5qs1oIYnOJWUEt/zL1m4i17msMeRk68z8AcsIY8QHa AHQMzhtvGIWfJ3i+QwuF7SZMkQo/ss4d4ENXEJpsi38cmB0Rm2DBWQ5wfbHLyZLLzQcrj0hUicC QUSH4ZJ1Np3HK/NUjZjn4mMSccb7PW6REjLxq+p31F7CyIsA1384J61uOc0w8ERqncCzEvWAz6f O4YRoyNPBTf7I/HeQP+7OoLAg0rQBnCbUo/SUzGN92ptt5ypzH4ZlaW68538/H/+O8Osc6bWXd0 a3IBnn295tkzDEvmJZQ6bm0euzUc3WzKnxmhVBnSFj/DwL4pVmbjNhSqksUsXGIUWwZskylcYlX ZKWqW2LDZ1ynxcF1qPYHx74HhNZ9Uczm1ak4e9TS0CVKuSTaGjX1SNwomvGPOx3XkQkFk= 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) Reviewed-by: Lorenzo Stoakes (ARM) 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 efd99298be135..7175ac8bfdaa3 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