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[2620:137:e000::1:20]) by mx.google.com with ESMTP id 88-20020a17090a09e100b00247ad11b6d3si14094442pjo.88.2023.04.25.04.14.59; Tue, 25 Apr 2023 04:15:12 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@bytedance.com header.s=google header.b=TvmnBK3T; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=bytedance.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233898AbjDYLGK (ORCPT + 99 others); Tue, 25 Apr 2023 07:06:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53218 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233907AbjDYLF7 (ORCPT ); Tue, 25 Apr 2023 07:05:59 -0400 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B70A65FDD for ; Tue, 25 Apr 2023 04:05:35 -0700 (PDT) Received: by mail-pf1-x429.google.com with SMTP id d2e1a72fcca58-63b4e5fdb1eso6802593b3a.1 for ; Tue, 25 Apr 2023 04:05:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1682420735; x=1685012735; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=s+OVqkfyvyT9tLRaTTTVeLMx7p1ihu2PyK06f3NH+m4=; b=TvmnBK3T5BGsKLcDBxe8I1B94ng08H2tuzNDpEqZoy1+LctQIiW4WT3RZcb/tHl2on 88ugTHoHu/LoNQs3vW+n1rhZKd/FtaELuBuuVd9rZJaB3jLXbc9nJVemoKn7pNdJPu7Z tyP3oAFD0+vym5HdffMKGu7KU5rXjbuZg3OIOmHOrpOLXiQYYysfM2OhZ1NIR8Q30bND 9Vb81GryXrwM+H52qTtiRELs/L3RGJ2omGxGUOjbzntjCSK3Xs6nlbR+6Jx5RgRGdyZI lvvTm032rA91XCwcpNpNFMrfC2Q9p97isiUAo5q0FefmZnH99JIs+GggNcuX0YNXfn/I FG1Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682420735; x=1685012735; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=s+OVqkfyvyT9tLRaTTTVeLMx7p1ihu2PyK06f3NH+m4=; b=JucePTNgPflyDoXISeME0Ftfet3w98LZzkn7TfdFf7c+R8fszVdNkgtaZwHv7PQaJq 8oVmqstOAHexCOsTh4LGvn+D3eYOtHHoyP6m5cH+GJSUWyZCLi4B6zwDNFfHIYIXHnI0 6sKif6qP6QoFwdcEIJZluNwDbq6puHCHox/r//x+EA1R3JHS8dVJ5aMu3f0eeLdmRefX sfAu+R/Wcr/LqlM/oZ8tMc+xVLNZ655M7a0tR3fBs5yDj9JmxTR/WNUouAOj7Xc0N9fS yEgHC/wsJZeOLuTzKzp4FvWgJFH6xoVmLUS7XD6K/gnJj+dlWsYsy7/afTfqRJKgxjU4 0ZYg== X-Gm-Message-State: AAQBX9c4sUsRP8Q9zBJbXO9IXMz2qeu5W4+J4tmlAkt2q2l2HfvkN+I/ 05eOyzVA191u29/Jxz5WvyesGQ== X-Received: by 2002:a05:6a00:1401:b0:636:e52f:631e with SMTP id l1-20020a056a00140100b00636e52f631emr22180035pfu.1.1682420735189; Tue, 25 Apr 2023 04:05:35 -0700 (PDT) Received: from GL4FX4PXWL.bytedance.net ([139.177.225.236]) by smtp.gmail.com with ESMTPSA id u3-20020a056a00158300b0063f3aac78b9sm4422169pfk.79.2023.04.25.04.05.32 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 25 Apr 2023 04:05:34 -0700 (PDT) From: Peng Zhang To: Liam.Howlett@oracle.com Cc: akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, maple-tree@lists.infradead.org, Peng Zhang Subject: [PATCH 3/9] maple_tree: Modify the allocation method of mtree_alloc_range/rrange() Date: Tue, 25 Apr 2023 19:05:05 +0800 Message-Id: <20230425110511.11680-4-zhangpeng.00@bytedance.com> X-Mailer: git-send-email 2.37.0 (Apple Git-136) In-Reply-To: <20230425110511.11680-1-zhangpeng.00@bytedance.com> References: <20230425110511.11680-1-zhangpeng.00@bytedance.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1764146609710674777?= X-GMAIL-MSGID: =?utf-8?q?1764146609710674777?= Let mtree_alloc_range() and mtree_alloc_rrange() use mas_empty_area() and mas_empty_area_rev() respectively for allocation to reduce code redundancy. And after doing this, we don't need to maintain two logically identical codes to improve maintainability. In fact, mtree_alloc_range/rrange() has some bugs. For example, when dealing with min equals to max (mas_empty_area/area_rev() has been fixed), the allocation will fail. There are still some other bugs in it, I saw it with my naked eyes, but I didn't test it, for example: When mtree_alloc_range()->mas_alloc()->mas_awalk(), we set mas.index = min, mas.last = max - size. However, mas_awalk() requires mas.index = min, mas.last = max, which may lead to allocation failures. Right now no users are using these two functions so the bug won't trigger, but this might trigger in the future. Also use mas_store_gfp() instead of mas_fill_gap() as I don't see any difference between them. After doing this, we no longer need the three functions mas_fill_gap(), mas_alloc(), and mas_rev_alloc(). Fixes: 54a611b60590 ("Maple Tree: add new data structure") Signed-off-by: Peng Zhang --- lib/maple_tree.c | 45 ++++++++++++--------------------------------- 1 file changed, 12 insertions(+), 33 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index aa55c914818a0..294d4c8668323 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -6362,32 +6362,20 @@ int mtree_alloc_range(struct maple_tree *mt, unsigned long *startp, { int ret = 0; - MA_STATE(mas, mt, min, max - size); + MA_STATE(mas, mt, 0, 0); if (!mt_is_alloc(mt)) return -EINVAL; if (WARN_ON_ONCE(mt_is_reserved(entry))) return -EINVAL; - if (min > max) - return -EINVAL; - - if (max < size) - return -EINVAL; - - if (!size) - return -EINVAL; - mtree_lock(mt); -retry: - mas.offset = 0; - mas.index = min; - mas.last = max - size; - ret = mas_alloc(&mas, entry, size, startp); - if (mas_nomem(&mas, gfp)) - goto retry; - + ret = mas_empty_area(&mas, min, max, size); + if (!ret) + ret = mas_store_gfp(&mas, entry, gfp); mtree_unlock(mt); + if (!ret) + *startp = mas.index; return ret; } EXPORT_SYMBOL(mtree_alloc_range); @@ -6398,29 +6386,20 @@ int mtree_alloc_rrange(struct maple_tree *mt, unsigned long *startp, { int ret = 0; - MA_STATE(mas, mt, min, max - size); + MA_STATE(mas, mt, 0, 0); if (!mt_is_alloc(mt)) return -EINVAL; if (WARN_ON_ONCE(mt_is_reserved(entry))) return -EINVAL; - if (min >= max) - return -EINVAL; - - if (max < size - 1) - return -EINVAL; - - if (!size) - return -EINVAL; - mtree_lock(mt); -retry: - ret = mas_rev_alloc(&mas, min, max, entry, size, startp); - if (mas_nomem(&mas, gfp)) - goto retry; - + ret = mas_empty_area_rev(&mas, min, max, size); + if (!ret) + ret = mas_store_gfp(&mas, entry, gfp); mtree_unlock(mt); + if (!ret) + *startp = mas.index; return ret; } EXPORT_SYMBOL(mtree_alloc_rrange);