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 3DA0B4D9F96; Tue, 13 Oct 2026 09:46:31 +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=1791884792; cv=none; b=dJdh/QfJ5VTSugRc2XEqqMUjT3bNVCwuHgbWJ70JTTsApdO2472wGejpsR2sssuCQzOhXE1tWCv6PybJSbbJv1Vdjpte/M7IqXLhl8Nk4RyYqYKxwpifM5hGdMPzu/rBtbOQTV/pGXB2TGwYsWhTzK1wZfLdYXwKBuM36Qo7AVY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791884792; c=relaxed/simple; bh=Rk5F+YgXDtLeCJh1Tw15hbS1luettNZ6/VQSYJ/YyaA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=FBMjPfwyaLZHXWsJTveGXuv1kep6zaZA11EubDvV5bAV2CzHes2ma7atGxDGqBfaN7eXLX3rUYh4dVlvpeyeLM12CymtW3O1Ql4lGle93kHIBXrdtIQRsXY/SOn/md29O0YdqFrmRgw94FrSgExZ6NgZlVJn/tzqr4sGxJ2kAjg= 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=Zzu6nG7s; 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="Zzu6nG7s" 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 4638F2934; Tue, 13 Oct 2026 02:46:27 -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 04E983F7B4; Tue, 13 Oct 2026 02:46:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1791884790; bh=Rk5F+YgXDtLeCJh1Tw15hbS1luettNZ6/VQSYJ/YyaA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Zzu6nG7sEEU3wq7e8YLpxUuKNz7L/c63u5rqI106GFvaosyQWRcwezEQXe1K3q/vI YGEBPaYtRtcvlW+7g6rjOedPJrEFHKniD55pmEOIoxlPuc06nTV003DfmQfgIaRXIo F5iCF6UIdMYcGWNbd9sCPj8Dcjbi1F8SL7zacVUs= From: Yeoreum Yun Date: Tue, 13 Oct 2026 10:46:06 +0100 Subject: [PATCH v6 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-v6-3-2c52d0484de3@arm.com> References: <20261013-fix_hpage_macro-v6-0-2c52d0484de3@arm.com> In-Reply-To: <20261013-fix_hpage_macro-v6-0-2c52d0484de3@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=Rk5F+YgXDtLeCJh1Tw15hbS1luettNZ6/VQSYJ/YyaA=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqzf3mXDurSPW14xWa1Yg53Yew0NcF722uPAkgr fWCFRdvgNaJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCas395gAKCRBt1cPRWsUx M1FQC/4vx32QNecL5GVdpG4R/rcnuylGSMdFDpzHdGPZbebIYCcuYvdcrQUx8rcVf9DbuIlzuHB SVP38VmBOdkOstbS8JU5NcxKDuiH/zCGVt1Gmuypzt2hhfA0iXhWOCnAn1uu0fzQdF6vDP1tbof 8QpZNGWPeL7vYLPw0vLZV9YuW/NY5+bBbK4xtKwSofXcFOI7oVrJD2s7ctsPjiqsyLbfdxezzv4 znpkhv6JwYHCfWrN47/rB24a8bEG1eBCoeH8WdCl1AYH6f/YxdY6OD9292CysqK3URfbVR4WkQu wYGcjFDCY3goQ+cJ5nxwP5kM+C5KZ/Xmn3Y/f/X+i/3mxb2EGdG0PQjMpKcZyUK80GnMDV61cLd xObOA20X0QRx/ieiaVlB9qn0w34wEjRCY/pKY91cC/ew21cG3FrNAlgTDzO9terWydXot3ex/fE 4Tpjsk4XUw0T96DCX2C2OgS+9p1w1RY/Kz1tCcxeFuHuMtYeuxTx7OqyLm3f9PVzoLpyE= 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 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