From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2D007C2BB48 for ; Tue, 15 Dec 2020 03:16:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E5BCC2247F for ; Tue, 15 Dec 2020 03:16:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725208AbgLODQL (ORCPT ); Mon, 14 Dec 2020 22:16:11 -0500 Received: from mail.kernel.org ([198.145.29.99]:43196 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728109AbgLODPR (ORCPT ); Mon, 14 Dec 2020 22:15:17 -0500 Date: Mon, 14 Dec 2020 19:14:35 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1608002076; bh=ptBliU7y2Jkvb1cOI7FqclgPNbjZTw+YOi3QVVwgMPI=; h=From:To:Subject:In-Reply-To:From; b=gVahuj8S4ZLy6Q25iYGFrp3V1Qs2b8FnTw1QizpdBWIGMvLR3ojihZRZoMdwqgYv6 1YEVhLqKfwWALmF+en/wzAVGQscK/zkCNfkdWsU11RdlfBtZuE5PQv5GpKqyo+c5Oo Ol6j7xC0b2be5vy21nzFsGq4i5/mfHJGpXZ4w6Oc= From: Andrew Morton To: akpm@linux-foundation.org, linux-mm@kvack.org, minchan@kernel.org, mm-commits@vger.kernel.org, rsalvaterra@gmail.com, sergey.senozhatsky.work@gmail.com, torvalds@linux-foundation.org Subject: [patch 192/200] zram: break the strict dependency from lzo Message-ID: <20201215031435.lygEVD9OD%akpm@linux-foundation.org> In-Reply-To: <20201214190237.a17b70ae14f129e2dca3d204@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Rui Salvaterra Subject: zram: break the strict dependency from lzo >>From the beginning, the zram block device always enabled CRYPTO_LZO, since lzo-rle is hardcoded as the fallback compression algorithm. As a consequence, on systems where another compression algorithm is chosen (e.g. CRYPTO_ZSTD), the lzo kernel module becomes unused, while still having to be built/loaded. This patch removes the hardcoded lzo-rle dependency and allows the user to select the default compression algorithm for zram at build time. The previous behaviour is kept, as the default algorithm is still lzo-rle. Link: https://lkml.kernel.org/r/20201207121245.50529-1-rsalvaterra@gmail.com Signed-off-by: Rui Salvaterra Suggested-by: Sergey Senozhatsky Suggested-by: Minchan Kim Acked-by: Minchan Kim Signed-off-by: Andrew Morton --- drivers/block/zram/Kconfig | 42 +++++++++++++++++++++++++++++++- drivers/block/zram/zcomp.c | 2 + drivers/block/zram/zram_drv.c | 2 - 3 files changed, 44 insertions(+), 2 deletions(-) --- a/drivers/block/zram/Kconfig~zram-break-the-strict-dependency-from-lzo +++ a/drivers/block/zram/Kconfig @@ -2,7 +2,7 @@ config ZRAM tristate "Compressed RAM block device support" depends on BLOCK && SYSFS && ZSMALLOC && CRYPTO - select CRYPTO_LZO + depends on CRYPTO_LZO || CRYPTO_ZSTD || CRYPTO_LZ4 || CRYPTO_LZ4HC || CRYPTO_842 help Creates virtual block devices called /dev/zramX (X = 0, 1, ...). Pages written to these disks are compressed and stored in memory @@ -14,6 +14,46 @@ config ZRAM See Documentation/admin-guide/blockdev/zram.rst for more information. +choice + prompt "Default zram compressor" + default ZRAM_DEF_COMP_LZORLE + depends on ZRAM + +config ZRAM_DEF_COMP_LZORLE + bool "lzo-rle" + depends on CRYPTO_LZO + +config ZRAM_DEF_COMP_ZSTD + bool "zstd" + depends on CRYPTO_ZSTD + +config ZRAM_DEF_COMP_LZ4 + bool "lz4" + depends on CRYPTO_LZ4 + +config ZRAM_DEF_COMP_LZO + bool "lzo" + depends on CRYPTO_LZO + +config ZRAM_DEF_COMP_LZ4HC + bool "lz4hc" + depends on CRYPTO_LZ4HC + +config ZRAM_DEF_COMP_842 + bool "842" + depends on CRYPTO_842 + +endchoice + +config ZRAM_DEF_COMP + string + default "lzo-rle" if ZRAM_DEF_COMP_LZORLE + default "zstd" if ZRAM_DEF_COMP_ZSTD + default "lz4" if ZRAM_DEF_COMP_LZ4 + default "lzo" if ZRAM_DEF_COMP_LZO + default "lz4hc" if ZRAM_DEF_COMP_LZ4HC + default "842" if ZRAM_DEF_COMP_842 + config ZRAM_WRITEBACK bool "Write back incompressible or idle page to backing device" depends on ZRAM --- a/drivers/block/zram/zcomp.c~zram-break-the-strict-dependency-from-lzo +++ a/drivers/block/zram/zcomp.c @@ -15,8 +15,10 @@ #include "zcomp.h" static const char * const backends[] = { +#if IS_ENABLED(CONFIG_CRYPTO_LZO) "lzo", "lzo-rle", +#endif #if IS_ENABLED(CONFIG_CRYPTO_LZ4) "lz4", #endif --- a/drivers/block/zram/zram_drv.c~zram-break-the-strict-dependency-from-lzo +++ a/drivers/block/zram/zram_drv.c @@ -42,7 +42,7 @@ static DEFINE_IDR(zram_index_idr); static DEFINE_MUTEX(zram_index_mutex); static int zram_major; -static const char *default_compressor = "lzo-rle"; +static const char *default_compressor = CONFIG_ZRAM_DEF_COMP; /* Module params (documentation at end) */ static unsigned int num_devices = 1; _