From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f181.google.com (mail-pl1-f181.google.com [209.85.214.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A55B138C2B8 for ; Fri, 24 Jul 2026 07:52:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.181 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784879536; cv=none; b=Ae/8lTpPfDisIeaVWCijjZPhSGtMVzoNy2pbl7M0hzwHjkcAvWTsx3s/vhcHndJ7/9F+RQboH5aEWaMAEOXajs2HeFsb0aROz6E9/FBLZ6v6ufVB0rWO3Eu4bhK3zSQEhQkhBAeTc+hcaA28oqxHpzYbnPdHmeE53DIk3qwEd+k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784879536; c=relaxed/simple; bh=3bp/LCOqYEbRe+qVTz+riFkXNQZIoegdbIbWRYYJrsQ=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=fcHpMKi/eSqy75FG1cc6ylGDuz3lgVq8sekHtNEn0oocPlNiMiPJOAqro5nW9GnKGYk1rT1Yaqa8sLwyiFh2NUKN9O/izdvwW7buPYjIBI+n0bD988NGXFhLsFqqfFYSJ472PGGNGzyYqTQZRE+F19tTTvjy8QeV+M2FtV7nxVo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=Helv8oCr; arc=none smtp.client-ip=209.85.214.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="Helv8oCr" Received: by mail-pl1-f181.google.com with SMTP id d9443c01a7336-2caea3f742bso2026715ad.0 for ; Fri, 24 Jul 2026 00:52:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1784879534; x=1785484334; darn=vger.kernel.org; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:from:to:cc:subject :date:message-id:reply-to:content-type; bh=3UTPDAS4LL2M4zgcjNoNg9Cb0YaXjfr58AH5VykXMLw=; b=Helv8oCrp3zrTh1g9ve1dHZ77u9FWJDuZ5eIaRIoEcm+SL+Q+ff48uhfA4Xrt/meRv 7reqCveRkw7Zo+AtLrU9lx6Z9vqxNI1Qui3K2OJNRD3YpIhtRuaym7Oo5CbGud7jEH+q WzVIJzfmxWIEYg3vAuPl8Bj0CZVg2IjyHzZmw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1784879534; x=1785484334; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=3UTPDAS4LL2M4zgcjNoNg9Cb0YaXjfr58AH5VykXMLw=; b=Bgq4ZrTxi1r/zGpfhixUVWDRF3fjVjI3HXOV9MSuciBqgq7130V6M4hYcIrgxrDdty Hvw3xbfs+ZzrVn92dvCXArJIVdDj/DR05pKVE2GcfoSTa1JmRMQWcl8IQwtZzUCIvNZy BBDaKg9K/CE9Srylget+nzuPc0zXzqjPVg5O5mEQSpmG3dLUmWnKCCPgkeOmaJ5mvoQd UhKHf0RsCC1YahE1Q53iwek/Fz7E65QRnIOwYdRMtrvERyxd4yZ6/zIBEo/ezFhQVJ1K rjobR0kGwfeA5lMOL4WRCR9WEhVccaHR3ADPnz5tGpg9I1jJ6TMjeN7lB0N6MDX7tSfZ 45Zg== X-Forwarded-Encrypted: i=1; AHgh+RrE9q4JlwD1U+oXOwcEwOZtZvtdTEIZ0Mg0ZJj63dolfpkebrXPp0LFoczCNpbF2n+jAZMClkT5e2avPac=@vger.kernel.org X-Gm-Message-State: AOJu0Yyq7MGJsf59UvOYKNLAxesiTY41YKJvf9PxWAxpHLKSmQ4bpcQM 1WH0O0b12NgroZ9R0qPZtDtGrwjA4gmYe5nX8l3/6Svifh+FkRGYdZCz02HCo8Ofuw== X-Gm-Gg: AR+sD11wpXDaLeFCPWAj091qLCFqGXwZ+B6xdV4DyryOoVYxsYxeNTZc9BcskKf9y7Q +Z151x1XACuEe+3OEp0KqCQW+IOxxKhDlzY10tdwIt0hVCiZslbwMUHSZtcJY5Us/i19XtK4XeJ MA4k4kVQIpCXdP2n8lP1K1sHPYf2xeOOqkS44xsdksqD+Sjk7RyxXx7C6jMfEkCKPQnOud9nKGA 3WdRM9DEIvVVNF2VRmO/410ZJWDgzXUJhu1PWSv2PfUmM7TnMWZp01k9laSG5gyFNghSS2punBZ 8fuFofw1UW1Fr1C1oyBSkMiNSFQWwplyEcC+9Jfg/kPOifmbpWCdGq/gPKV+BRFiZVwrFzIl+UX iZwwa58z3iKwpLKVYLIemNEx9GiO/dBjmKLbnev1V3c7lauz4yg972wzjxLDq+BhKQhowBKyM4D d7ODuLHHrx1yzEBIyLMqlOpZPs7zNKwivrO70FaqA6rA== X-Received: by 2002:a17:902:ec8d:b0:2c9:f73d:4b38 with SMTP id d9443c01a7336-2cfa6be13b4mr74259095ad.19.1784879533947; Fri, 24 Jul 2026 00:52:13 -0700 (PDT) Received: from google.com ([2a00:79e0:2031:6:c102:f12d:5168:6be5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2cf8efa38c1sm48114145ad.8.2026.07.24.00.52.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Jul 2026 00:52:13 -0700 (PDT) Date: Fri, 24 Jul 2026 16:52:10 +0900 From: Sergey Senozhatsky To: Sebastian Andrzej Siewior Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, Minchan Kim , Jens Axboe , Sergey Senozhatsky Subject: Re: [PATCH 2/2] zram: Use a custom key for each zram object. Message-ID: References: <20260714141300.3945672-1-bigeasy@linutronix.de> <20260714141300.3945672-3-bigeasy@linutronix.de> 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=us-ascii Content-Disposition: inline In-Reply-To: On (26/07/24 12:24), Sergey Senozhatsky wrote: > > static bool zram_meta_alloc(struct zram *zram, u64 disksize) > > @@ -1999,7 +1993,8 @@ static bool zram_meta_alloc(struct zram *zram, u64 disksize) > > if (!huge_class_size) > > huge_class_size = zs_huge_class_size(zram->mem_pool); > > > > - slot_lock_init(zram); > > + lockdep_register_key(&zram->table_lock_key); > > + lockdep_init_map(&zram->table_lock_map, "zram->table[index].lock", &zram->table_lock_key, 0); > > So I wonder if we can give distinct name, given that it's per-device > now: "zram%d->table[index].lock" and use zram->disk->first_minor (which > is a unique device id). Probably (see below) is not worth it. All those ifdef-s... We used static name before and didn't have problems with it. So let's just keep doing so (IOW let's keep not having problems ;)) // completely untested ---- diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 4bfe63a5225d..080012e83f86 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1956,6 +1956,31 @@ static ssize_t debug_stat_show(struct device *dev, return ret; } +static void zram_lockdep_map_release(struct zram *zram) +{ +#ifdef CONFIG_LOCKDEP + lockdep_unregister_key(&zram->table_lock_key); + kfree(zram->table_lock_name); +#endif +} + +static int zram_lockdep_map_init(struct zram *zram) +{ +#ifdef CONFIG_LOCKDEP + zram->table_lock_name = kasprintf(GFP_KERNEL, + "zram%d->table[index].lock", + zram->disk->first_minor); + if (!zram->table_lock_name) + return -ENOMEM; + + lockdep_register_key(&zram->table_lock_key); + lockdep_init_map(&zram->table_lock_map, zram->table_lock_name, + &zram->table_lock_key, 0); +#endif + return 0; +} + static void zram_meta_free(struct zram *zram, u64 disksize) { size_t num_pages = disksize >> PAGE_SHIFT; @@ -1971,7 +1996,7 @@ static void zram_meta_free(struct zram *zram, u64 disksize) zs_destroy_pool(zram->mem_pool); vfree(zram->table); zram->table = NULL; - lockdep_unregister_key(&zram->table_lock_key); + zram_lockdep_map_release(zram); } static bool zram_meta_alloc(struct zram *zram, u64 disksize) @@ -1990,12 +2015,16 @@ static bool zram_meta_alloc(struct zram *zram, u64 disksize) return false; } + if (zram_lockdep_map_init(zram)) { + zs_destroy_pool(zram->mem_pool); + vfree(zram->table); + zram->table = NULL; + return false; + } + if (!huge_class_size) huge_class_size = zs_huge_class_size(zram->mem_pool); - lockdep_register_key(&zram->table_lock_key); - lockdep_init_map(&zram->table_lock_map, "zram->table[index].lock", &zram->table_lock_key, 0); - return true; } diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h index 4fddc582f3b8..377832477588 100644 --- a/drivers/block/zram/zram_drv.h +++ b/drivers/block/zram/zram_drv.h @@ -106,8 +106,6 @@ struct zram_stats { struct zram { struct zram_table_entry *table; - struct lockdep_map table_lock_map; - struct lock_class_key table_lock_key; struct zs_pool *mem_pool; struct zcomp *comps[ZRAM_MAX_COMPS]; struct zcomp_params params[ZRAM_MAX_COMPS]; @@ -143,5 +141,11 @@ struct zram { #ifdef CONFIG_ZRAM_MEMORY_TRACKING struct dentry *debugfs_dir; #endif + + struct lockdep_map table_lock_map; + struct lock_class_key table_lock_key; +#ifdef CONFIG_LOCKDEP + char *table_lock_name; +#endif }; #endif