From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 A7B5718EB0; Wed, 7 May 2025 15:20:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746631257; cv=none; b=nRSrAUU2jwNzmCAcpMRRbjE+LbrkSpRzQw9ZROb3QS/bWxueWY/lJD51/i6S0law5Y62+PtJC8+q2Bmx1nI7ckm4uqbgyxBk52Rglrd+y3yfgFBWVa/CrxOXCfaOTl79hvmcEz4pYf8XDYaQN2i/TRbjO67DEvybR+MRGCOG/1s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746631257; c=relaxed/simple; bh=DMuRy3vH/9HB8MP/eHAh3lYTSsXJDYIcI3IY1DjMl9w=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=FLSgOflBKUjI0rPo2ZBuB+OE0knfD8CbS7Cuo8NWQfKnP1vMZ6AHhCRmsTagNEdWW7dt00LfyL3bfo1Yfgu7qcU6jJO40lW4aDU+2V9cgBpaDMMAIZamK5cO/2F1SSLB01bWnlomYCftBNlhpQpo9FQleEsM59lxP860eIMEFWc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XtWCiZBB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XtWCiZBB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B24D4C4CEE2; Wed, 7 May 2025 15:20:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746631256; bh=DMuRy3vH/9HB8MP/eHAh3lYTSsXJDYIcI3IY1DjMl9w=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=XtWCiZBBDcigCs9rAvAR90ZGDu/yeCGV3FKIg+lWgQE5tggI55fQ1EThnEsOeZK6q DMgxmlLMOatvtvVSXCn/BryaK7YoFbb2M/POZrcgkS6EZYv7YUBvmZil/SK50Hh4lr 5WjXKMjsXaXd4xa42SXkRvSxdbQSR/XvJWhUymwiON2nv7AERNtl3vpyW0LoQK7YAy cxJpPfw1+r6CRqcco+5MVQkED2iX9uAWZ9Qy4qG4xvssMDOKQ/FfnL7O6xphMDJEUB irILuNpPN/+Wv1FrkUGgMyxd+d/QABeUU6LhMKNH4yRpDpoYG7R4C5hZcdsme1/nqV Qyvq/zT/vj8NA== Date: Wed, 7 May 2025 18:20:47 +0300 From: Mike Rapoport To: Yuquan Wang Cc: Jonathan.Cameron@huawei.com, dan.j.williams@intel.com, rafael@kernel.org, lenb@kernel.org, akpm@linux-foundation.org, alison.schofield@intel.com, rrichter@amd.com, bfaccini@nvidia.com, haibo1.xu@intel.com, david@redhat.com, chenhuacai@kernel.org, linux-cxl@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, chenbaozi@phytium.com.cn, loongarch@lists.linux.dev Subject: Re: [PATCH v2] mm: numa_memblks: introduce numa_add_reserved_memblk Message-ID: References: <20250506062245.3816791-1-wangyuquan1236@phytium.com.cn> Precedence: bulk X-Mailing-List: linux-acpi@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: <20250506062245.3816791-1-wangyuquan1236@phytium.com.cn> On Tue, May 06, 2025 at 02:22:45PM +0800, Yuquan Wang wrote: > acpi_parse_cfmws() currently adds empty CFMWS ranges to numa_meminfo > with the expectation that numa_cleanup_meminfo moves them to > numa_reserved_meminfo. There is no need for that indirection when it is > known in advance that these unpopulated ranges are meant for > numa_reserved_meminfo in support of future hotplug / CXL provisioning. > > Introduce and use numa_add_reserved_memblk() to add the empty CFMWS > ranges directly. > > Signed-off-by: Yuquan Wang Acked-by: Mike Rapoport (Microsoft) > --- > > Changes in v2 (Thanks to Dan & Alison): > - Use numa_add_reserved_memblk() to replace numa_add_memblk() in acpi_parse_cfmws() > - Add comments to describe the usage of numa_add_reserved_memblk() > - Updating the commit message to clarify the purpose of the patch > > By the way, "LoongArch: Introduce the numa_memblks conversion" is in linux-next. > > drivers/acpi/numa/srat.c | 2 +- > include/linux/numa_memblks.h | 1 + > mm/numa_memblks.c | 22 ++++++++++++++++++++++ > 3 files changed, 24 insertions(+), 1 deletion(-) > > diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c > index 0a725e46d017..751774f0b4e5 100644 > --- a/drivers/acpi/numa/srat.c > +++ b/drivers/acpi/numa/srat.c > @@ -453,7 +453,7 @@ static int __init acpi_parse_cfmws(union acpi_subtable_headers *header, > return -EINVAL; > } > > - if (numa_add_memblk(node, start, end) < 0) { > + if (numa_add_reserved_memblk(node, start, end) < 0) { > /* CXL driver must handle the NUMA_NO_NODE case */ > pr_warn("ACPI NUMA: Failed to add memblk for CFMWS node %d [mem %#llx-%#llx]\n", > node, start, end); > diff --git a/include/linux/numa_memblks.h b/include/linux/numa_memblks.h > index dd85613cdd86..991076cba7c5 100644 > --- a/include/linux/numa_memblks.h > +++ b/include/linux/numa_memblks.h > @@ -22,6 +22,7 @@ struct numa_meminfo { > }; > > int __init numa_add_memblk(int nodeid, u64 start, u64 end); > +int __init numa_add_reserved_memblk(int nid, u64 start, u64 end); > void __init numa_remove_memblk_from(int idx, struct numa_meminfo *mi); > > int __init numa_cleanup_meminfo(struct numa_meminfo *mi); > diff --git a/mm/numa_memblks.c b/mm/numa_memblks.c > index ff4054f4334d..541a99c4071a 100644 > --- a/mm/numa_memblks.c > +++ b/mm/numa_memblks.c > @@ -200,6 +200,28 @@ int __init numa_add_memblk(int nid, u64 start, u64 end) > return numa_add_memblk_to(nid, start, end, &numa_meminfo); > } > > +/** > + * numa_add_reserved_memblk - Add one numa_memblk to numa_reserved_meminfo > + * @nid: NUMA node ID of the new memblk > + * @start: Start address of the new memblk > + * @end: End address of the new memblk > + * > + * Add a new memblk to the numa_reserved_meminfo. > + * > + * Usage Case: numa_cleanup_meminfo() reconciles all numa_memblk instances > + * against memblock_type information and moves any that intersect reserved > + * ranges to numa_reserved_meminfo. However, when that information is known > + * ahead of time, we use numa_add_reserved_memblk() to add the numa_memblk > + * to numa_reserved_meminfo directly. > + * > + * RETURNS: > + * 0 on success, -errno on failure. > + */ > +int __init numa_add_reserved_memblk(int nid, u64 start, u64 end) > +{ > + return numa_add_memblk_to(nid, start, end, &numa_reserved_meminfo); > +} > + > /** > * numa_cleanup_meminfo - Cleanup a numa_meminfo > * @mi: numa_meminfo to clean up > -- > 2.34.1 > -- Sincerely yours, Mike.