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 8F87C331ECC; Thu, 25 Jun 2026 14:57:30 +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=1782399451; cv=none; b=KD5uDSnfR8734zyc9xXvkKl34oVVtn8W+a5UO/HC5CKOPvK/DEZsEJAbYOY0MpYAoo9hvqPP6qKfx1fLXuFQuMY2Zx24JV+pke8CH3t0GF0veR+RIWWX9RSmTHi6o+Yq3SpjJGapVI1CJVY6pKq8fA/3ibLDBzxknW6r2L5X2Jc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782399451; c=relaxed/simple; bh=30zBPsJzeKdzDn+/lVWB6w0298dmMH2KV5iosn8rXac=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=nmjfYfHuQrrSu4SnrgWZ/AV6wQPQzeKwvQgN4IF24tawdT3f343n4kUkGsP4PmkzZm+fiHXswB5wkgsOGH+suNAvvfKot+ScsiQ89MksFFfUIkMVsAhCYCG32R67XMubDggzJ1hxTuHX3k20mOBgkZnFsoQaV62s8qVd0vi3v34= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DL1K+Jv9; 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="DL1K+Jv9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8D2BF1F00A3A; Thu, 25 Jun 2026 14:57:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782399450; bh=tqUUrJWMlnTxsZAmuCi7Oz0YuD8ibL81XGHYLTsNdR8=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=DL1K+Jv96MT0STD98/+fBEA4SYv29IHhKaFiC+RmpwELEsqKNGQsv/zck1jcHqfcM oJ97ezN5ImmlSNchaHCpXwWHJ6nx17ovfOWdak1r1eVacHbGY6Keg8yhKxOxWkOmo8 tRan2Dat0DRFm3421OF/ccb7ARrVS4UHX9JS9vKCvpOwLpbbnsPdAtaXp3aEzdgsm0 mQx0LitzsrW/V6CAMqNf8oZzCP4BNDZVWA4m6N/rR7UkMUCxm1aCc2p30p1KVCecR0 jNa23zu3G5AD+mZb2srrlLMfTJAqz3xx9JuNIJ/IVTU2w//K1JmVKXcQA+ZCz0Eyuy PzUJXnJ/D2q2Q== Message-ID: Date: Thu, 25 Jun 2026 16:57:21 +0200 Precedence: bulk X-Mailing-List: driver-core@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 5/9] mm/memory_hotplug: offline_and_remove_memory_ranges() To: Gregory Price Cc: linux-mm@kvack.org, nvdimm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-cxl@vger.kernel.org, driver-core@lists.linux.dev, linux-kselftest@vger.kernel.org, kernel-team@meta.com, osalvador@suse.de, gregkh@linuxfoundation.org, rafael@kernel.org, dakr@kernel.org, djbw@kernel.org, vishal.l.verma@intel.com, dave.jiang@intel.com, akpm@linux-foundation.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, shuah@kernel.org, alison.schofield@intel.com, Smita.KoralahalliChannabasappa@amd.com, ira.weiny@intel.com, apopple@nvidia.com References: <20260624145744.3532049-1-gourry@gourry.net> <20260624145744.3532049-6-gourry@gourry.net> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 6/25/26 15:51, Gregory Price wrote: > On Thu, Jun 25, 2026 at 09:22:01AM +0200, David Hildenbrand (Arm) wrote: >> On 6/24/26 16:57, Gregory Price wrote: >>> extern int offline_and_remove_memory(u64 start, u64 size); >>> +int offline_and_remove_memory_ranges(const struct range *ranges, int nr_ranges); >>> >>> #else >>> static inline void try_offline_node(int nid) {} >>> @@ -283,6 +284,12 @@ static inline int remove_memory(u64 start, u64 size) >>> } >>> >>> static inline void __remove_memory(u64 start, u64 size) {} >>> + >>> +static inline int offline_and_remove_memory_ranges(const struct range *ranges, >>> + int nr_ranges) >> >> Best to use "unsigned int" right from the start and use two tabs to indent. >> > > ack, ack. need to reprogram my brain to two-indent style, i keep doing > this reflexively. > >>> +int offline_and_remove_memory_ranges(const struct range *ranges, int nr_ranges) >>> +{ >>> + unsigned long mb_total = 0; >>> uint8_t *online_types, *tmp; >>> - int rc; >>> + int i, rc = 0; >>> >>> - if (!IS_ALIGNED(start, memory_block_size_bytes()) || >>> - !IS_ALIGNED(size, memory_block_size_bytes()) || !size) >>> + if (!ranges || nr_ranges <= 0) >> >> With "unsigned int" this will be !nr_ranges. >> >> Wondering whether we would WARN_ON_ONCE() here. >> > > Seems reasonable. Do we normally WARN when callers send dumb arguments? > Seems like sending -EINVAL is sufficient? We do it when we really expect no sane user to do that and doing it would indicate an actual problem. Like passing a nid to add_memory_resource() that doesn't even exist. But yeah, no strong opinion here, we can just keep it as is. -- Cheers, David