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 407BD19D062; Mon, 14 Oct 2024 10:59:59 +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=1728903601; cv=none; b=CVmTu8QbpgCf+ZoiFLfrg0QZzzp8cGHT0hUojEwJo0fqsyf0SJrkUwDEt7+/ZyTwlwvyel0vQpV2jUcYle9JMghNLHQrDgo+mqnAs+Yg264a77WeVmd684BWSf1KBvBMP5uRUrDy70Kq07an/y89InKEyOCt6x7WtvVF0++24xM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728903601; c=relaxed/simple; bh=vfJwjToLALeeCjImxT2qgvgczni/pAelp8cETW25/gs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jvEPLtDCCJQhB2htmy4MoT/s1Xq4Tc/y7w4fS2Cv0TZkZ/K9PgUR5pwS6RHkQrAzcabpei2U4COw8NIezvUVO2Jd6SHs5visMDLDVwdG8hUlG2CVwmk8P5xkQILU2jpWcNvW0O0aSfvR9M8nClSRvmbg6/3hGETiPq3hXLjhAMY= 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; 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 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 432CD1684; Mon, 14 Oct 2024 04:00:28 -0700 (PDT) Received: from e125769.cambridge.arm.com (e125769.cambridge.arm.com [10.1.196.27]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D33E63F51B; Mon, 14 Oct 2024 03:59:55 -0700 (PDT) From: Ryan Roberts To: "Theodore Ts'o" , Andreas Dilger , Andrew Morton , Anshuman Khandual , Ard Biesheuvel , Catalin Marinas , David Hildenbrand , Greg Marsden , Ivan Ivanov , Kalesh Singh , Marc Zyngier , Mark Rutland , Matthias Brugger , Miroslav Benes , Will Deacon Cc: Ryan Roberts , linux-arm-kernel@lists.infradead.org, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v1 10/57] fs/ext4: Remove PAGE_SIZE compile-time constant assumption Date: Mon, 14 Oct 2024 11:58:17 +0100 Message-ID: <20241014105912.3207374-10-ryan.roberts@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241014105912.3207374-1-ryan.roberts@arm.com> References: <20241014105514.3206191-1-ryan.roberts@arm.com> <20241014105912.3207374-1-ryan.roberts@arm.com> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit To prepare for supporting boot-time page size selection, refactor code to remove assumptions about PAGE_SIZE being compile-time constant. Code intended to be equivalent when compile-time page size is active. Convert CPP PAGE_SIZE conditionals to C if/else. For compile-time page size, the compiler will strip the dead part, and for boot-time page size, the condition will be evaluated at run time. Signed-off-by: Ryan Roberts --- ***NOTE*** Any confused maintainers may want to read the cover note here for context: https://lore.kernel.org/all/20241014105514.3206191-1-ryan.roberts@arm.com/ fs/ext4/ext4.h | 36 ++++++++++++++++++------------------ 1 file changed, 18 insertions(+), 18 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 08acd152261ed..1a6dbd925024a 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2415,31 +2415,31 @@ ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize) { unsigned len = le16_to_cpu(dlen); -#if (PAGE_SIZE >= 65536) - if (len == EXT4_MAX_REC_LEN || len == 0) - return blocksize; - return (len & 65532) | ((len & 3) << 16); -#else - return len; -#endif + if (PAGE_SIZE >= 65536) { + if (len == EXT4_MAX_REC_LEN || len == 0) + return blocksize; + return (len & 65532) | ((len & 3) << 16); + } else { + return len; + } } static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize) { BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3)); -#if (PAGE_SIZE >= 65536) - if (len < 65536) + if (PAGE_SIZE >= 65536) { + if (len < 65536) + return cpu_to_le16(len); + if (len == blocksize) { + if (blocksize == 65536) + return cpu_to_le16(EXT4_MAX_REC_LEN); + else + return cpu_to_le16(0); + } + return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); + } else { return cpu_to_le16(len); - if (len == blocksize) { - if (blocksize == 65536) - return cpu_to_le16(EXT4_MAX_REC_LEN); - else - return cpu_to_le16(0); } - return cpu_to_le16((len & 65532) | ((len >> 16) & 3)); -#else - return cpu_to_le16(len); -#endif } /* -- 2.43.0