From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Fri, 14 Mar 2025 17:17:16 +0100 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tt7in-00E4cr-0f for lore@lore.pengutronix.de; Fri, 14 Mar 2025 17:17:16 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1tt7im-000606-0p for lore@pengutronix.de; Fri, 14 Mar 2025 17:17:16 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:Date:Message-Id:Subject:References:In-Reply-To:To: From:Reply-To:Cc:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=FUmXgkiRNnSl9MdpT98QSsbV5ujd0kAIaFoSH6H1StM=; b=R6Ms2fZHYyG6HuX2Zc5l9VBBqG 98uDiee3ycU0fI1eu7Ew8Ez7WR6D8zvzhIuFgePCk1tIdFfAVZ32tD2FmCEG0+Bub1l637drSuVgm MvHRJ7+l0piNlcTKea/H1UfEiOHkF2hyPDGzwKkwJqrmBlZiB2cOlEtctDq4IBzagtBfUOnFi/pWF w0Y3ieA97K7y7CPUz4QmN/HympOAgCJ458vSAoYbJRYnap8s3Ouq+K3NobvY5NsLeIlMmCL5m6Fj/ 2lyg3raWf+Far19GDJcmgQBgx1KmaaTzYEDoV7fQJlPJIswOHnzTaArTcKNL1wnRJSn1Dj7X/YQVE TyyFty9Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tt7iN-0000000EilK-1evI; Fri, 14 Mar 2025 16:16:51 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tt7dH-0000000EhG8-45Wu for barebox@lists.infradead.org; Fri, 14 Mar 2025 16:11:37 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1tt7dF-0004q4-Tm; Fri, 14 Mar 2025 17:11:33 +0100 Received: from dude02.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::28]) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tt7dF-005jFQ-2M; Fri, 14 Mar 2025 17:11:33 +0100 Received: from localhost ([::1] helo=dude02.red.stw.pengutronix.de) by dude02.red.stw.pengutronix.de with esmtp (Exim 4.96) (envelope-from ) id 1tt7dF-00HHsM-28; Fri, 14 Mar 2025 17:11:33 +0100 From: Sascha Hauer To: barebox@lists.infradead.org, Ahmad Fatoum In-Reply-To: <20250313085658.13255-1-a.fatoum@pengutronix.de> References: <20250313085658.13255-1-a.fatoum@pengutronix.de> Message-Id: <174196869365.4120263.12791985060424280026.b4-ty@pengutronix.de> Date: Fri, 14 Mar 2025 17:11:33 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Mailer: b4 0.12.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250314_091136_014070_3FE04B4F X-CRM114-Status: UNSURE ( 6.91 ) X-CRM114-Notice: Please train this message. X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.2 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: [PATCH] malloc: return ZERO_SIZE_PTR for 0-byte allocations X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) On Thu, 13 Mar 2025 09:56:58 +0100, Ahmad Fatoum wrote: > Linux kmalloc doesn't return NULL on 0-byte allocations, but returns a > fixed ZERO_PSIZE_PTR constant, which triggers a NULL page exception when > dereferenced. > > However, in barebox, allocator behavior differs: > > - glibc returns an unique pointer, but the standard also allows > libc implementations to return NULL > - tlsf returns NULL > - dlmalloc returns a unique pointer > - dummy malloc returns a unique pointer > > [...] Applied, thanks! [1/1] malloc: return ZERO_SIZE_PTR for 0-byte allocations https://git.pengutronix.de/cgit/barebox/commit/?id=3f5b270289be (link may not be stable) Best regards, -- Sascha Hauer