From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 422CA3E959A; Wed, 3 Jun 2026 16:22:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780503767; cv=none; b=e5PBnanOok+eSiu6kHiMqSAdNsIJ0hIU/S5HUtS29CMHRkozIF/E7McRB1ael8Fm3j+23RL5D4H+otH7/WPaVYc++0QfqGJrLOfAlI8sGUtB1ETsaMbhzWpFjs7HPLjgIlVyzvLv0fX8gcWTrugS62AHqUVMBCjBMuJNEHa324Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780503767; c=relaxed/simple; bh=LeFet8aJxtSJyQ13LV6ERwETBJSY/W0pancMKGK78HA=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=WxvYWu+9BGQzF8Uebrxml828YaldnAfKhdGxULNfaJjLrF73xDRVu521zZ/Vek4cWB5hDhfRV/r4+2t1X+s75u/51fIl06sABHXY5SYSONLu/+KrUmxEf6KB3yaYE7Z7aGWpEgt4OcE0vjUcyC1w1KZnTs/fp0Sp+eKz+g9UUbs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KmKmrL6P; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="KmKmrL6P" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 024BF1F00893; Wed, 3 Jun 2026 16:22:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1780503765; bh=CxPhfVSO1PMBoWPiKi9ZwlNxfl6TXOtrDKfoICaOCcw=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=KmKmrL6PswCLcYojvpvZX8QoCfztwKuJFaEFgpHaGxc3Vpz4WNJTGjNXUOdXgBMPG pfvWqWoQhPOk9xY3gH/FSWhOZBMAJNdcTVkuJHaEyWSr/cUJ25JOb/wA87+CGgvHXq 8XHpMxjqKz57R+JVa29dzsNEtBi83+f6n5FGjxq9GGtG+zV1XSEVZ0JvFzn7ctkqvQ 65peuRFmiA22Veq9kCRGtqCIkm4VxBh1KBgl3MiXlW5TUyQq5VtyopJIJTmDuMz5A9 m6OudFzZkl4NQNqflq8rui6SMZo0KpZecbcFwKBdkVPTowovyF4pt6+gQEpKWBADT1 yIzkRHuRwpS8g== Message-ID: Date: Wed, 3 Jun 2026 18:22:38 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/slab: improve kmem_cache_alloc_bulk Content-Language: en-US To: rob.clark@oss.qualcomm.com Cc: Christoph Hellwig , Harry Yoo , Andrew Morton , Mark Brown , Hao Li , Christoph Lameter , David Rientjes , Roman Gushchin , Jesper Dangaard Brouer , linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, io-uring@vger.kernel.org, kasan-dev@googlegroups.com, bpf@vger.kernel.org, netdev@vger.kernel.org, Alexander Lobakin , Boris Brezillon References: <20260528093437.2519248-1-hch@lst.de> <20260528093437.2519248-2-hch@lst.de> <5f7f90d8-cb32-4ffb-8f1c-0722aafbe869@kernel.org> <20260529135045.GA10647@lst.de> <5f3ba603-a6ad-4cf2-9a54-aebc10273c59@kernel.org> <58cc76e7-2348-443d-a989-2a06e61178af@kernel.org> <20260601113831.GA25535@lst.de> <5e6948b3-d235-4b61-aed7-e8b4d0f5b452@kernel.org> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 6/3/26 13:13, Rob Clark wrote: > On Wed, Jun 3, 2026 at 2:17 AM Vlastimil Babka (SUSE) wrote: >> >> We know p->pages is NULL in this case, right? Because it was allocated by >> vm_bind_job_create() using kzalloc(). >> And the job can't be reused with a leftover value? >> (msm_iommu_pagetable_prealloc_cleanup doesn't set p->pages to zero). >> Or should we set p->pages to NULL here. > > Correct, the job is not reused. But I suppose setting p->pages to > NULL would make things more obvious, so no objection to that. OK, did that, just in case. Thanks. > BR, > -R > >> > + >> > p->pages = kvmalloc_objs(*p->pages, p->count); >> > if (!p->pages) >> > return -ENOMEM; >> > >> > ret = kmem_cache_alloc_bulk(pt_cache, GFP_KERNEL, p->count, p->pages); >> > if (ret != p->count) { >> > - kfree(p->pages); >> > + kvfree(p->pages); >> > p->pages = NULL; >> > p->count = ret; >> > return -ENOMEM; >>