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 609253EC80B; Mon, 14 Sep 2026 07:31:16 +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=1789371078; cv=none; b=kyIR7P4oH8QEc677lGOKGb6RakPamQ8fH7rtd82ST9oW9drVZtcL7Va+5hyU8IcWdN6wwVGKVPDbV59mddk/wg3sj7AxKF8VnkjJkuPB8zOPr7+ALbRLrDsDB2H4tOr/NM9xvxWrp49uasK9+cqFaZLd2uGswk9xhDLAceydnok= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789371078; c=relaxed/simple; bh=BeGlU6VoC2nhiSQChEYkjBQ7HxlULOrBNPE3lWJ9ZRw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Q9TI89Zw4uQ94KRp8pKNCF7hVSh2jrAVKHxLra1Z7UCYlC56D/F3elo86kQJpaD+akLgzqgllQsyhnsot43BiaPo+dl5hyfInxV6iHR+4KqVtWT4Ws5PEatCSU8YSaJb1sXjzPsgKDL3wO7fPeFmoW/0mA2TEeppwj43JiqWJsk= 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=e3Lv730m; 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="e3Lv730m" 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 D43B81C14; Mon, 14 Sep 2026 00:31:11 -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 0BCB93F59E; Mon, 14 Sep 2026 00:31:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1789371075; bh=BeGlU6VoC2nhiSQChEYkjBQ7HxlULOrBNPE3lWJ9ZRw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=e3Lv730mJzEu/e0Xwxm1fzVM6ZLQ7xGlk7OMGxPIgbgNKgKR83jEZuObZdEcLuQNP Je4dImHlXBcx+Ltsv5q08gwvRbvv84+aB1hJJ70PGMQam9zjbgQPrOdFs8boReoBGO FdnARscTr6MxLUQopNNJDWR4luwOq6U4S5f6XfHM= From: Yeoreum Yun Date: Mon, 14 Sep 2026 08:30:48 +0100 Subject: [PATCH v3 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: <20260914-fix_hpage_macro-v3-3-c9a305a01d39@arm.com> References: <20260914-fix_hpage_macro-v3-0-c9a305a01d39@arm.com> In-Reply-To: <20260914-fix_hpage_macro-v3-0-c9a305a01d39@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=1704; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=BeGlU6VoC2nhiSQChEYkjBQ7HxlULOrBNPE3lWJ9ZRw=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqp6KzBl9ctDoG65maPc1EIPIDgHe0gQnqDEXw/ s+xku9RaRaJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCaqeiswAKCRBt1cPRWsUx M9/0C/9PWswjSpx0cGos+ZePQPwtwlTukxcDz008DaWMjW9Pkd3nB3L9u8cQBWHisni2DEI+aMN kusuTkSLArK90ltCu5NtTJFZdhtn36RMPnUL4M2Q1OFsGo+ko+flul75cKIGY6pdvJt+soRQpTG GgTDMU1jmqpJElRdvszmhchzZb4+KdcqdRkkTRX6cmsxzbza6tiKK/7v88Uh6XihVlWgiqYLvJb xTGxWNJ09cRBAFKP6OeTMLSvQXXe0MtfBw34NRIQnQJyaDsWBiIzeFTewlGvqXlQOP9T56atWqR /lEKfvTY9G3w2ekHpscWvy7ULp9UesNcGm7LpHAIDASOR3tDhTt7mRxJ/YLBWODIbTjWTiW0SJO AjKB7jeq2PVA7id415eseiDmefXz78nXY+2d46buB4Fcd4Q3pClXBHLf/wXX5zi4wkde9NwuObH WFjQVU+atoMMulCs/5FNLVeuWbpvKyq3j6yGrv3Hen91EihT4zvce3x442qRLJWiIvPKo= 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) Signed-off-by: Yeoreum Yun --- tools/testing/selftests/mm/vm_util.c | 10 +++++++++- tools/testing/selftests/mm/vm_util.h | 1 + 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c index fd1432dc6152..1fef1266429f 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -157,6 +157,14 @@ bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len) return false; } +uint64_t size_to_shift(uint64_t size) +{ + if (__builtin_popcountll(size) != 1) + return 0; + + return ffsl(size) - 1; +} + uint64_t pmd_psize(void) { int fd; @@ -194,7 +202,7 @@ uint64_t pmd_pshift(void) if (!__pmd_psize) return 0; - __pmd_pshift = ffsl(__pmd_psize) - 1; + __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 71af4804f8f2..0048e0e82770 100644 --- a/tools/testing/selftests/mm/vm_util.h +++ b/tools/testing/selftests/mm/vm_util.h @@ -90,6 +90,7 @@ bool pagemap_is_populated(int fd, char *start); unsigned long pagemap_get_pfn(int fd, char *start); void clear_softdirty(void); bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len); +uint64_t size_to_shift(uint64_t size); uint64_t pmd_psize(void); uint64_t pmd_pshift(void); unsigned long rss_anon(void); -- 2.43.0