linux-kernel - [PATCH RFC 11/22] drivers: base: remove unnecessary call to register_cpu_under

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Message-Id: <E1r0JLa-00CTxY-Uv@rmk-PC.armlinux.org.uk>
Date:   Tue, 07 Nov 2023 10:30:14 +0000
From:   "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To:     linux-pm@...r.kernel.org, loongarch@...ts.linux.dev,
        linux-acpi@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, kvmarm@...ts.linux.dev,
        x86@...nel.org, linux-csky@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-parisc@...r.kernel.org
Cc:     Salil Mehta <salil.mehta@...wei.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        jianyong.wu@....com, justin.he@....com,
        James Morse <james.morse@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: [PATCH RFC 11/22] drivers: base: remove unnecessary call to
 register_cpu_under_node()

Since "drivers: base: Move cpu_dev_init() after node_dev_init()", we
can remove some redundant code.

node_dev_init() will walk through the nodes calling register_one_node()
on each. This will trickle down to __register_one_node() which walks
all present CPUs, calling register_cpu_under_node() on each.

register_cpu_under_node() will call get_cpu_device(cpu) for each, which
will return NULL until the CPU is registered using register_cpu(). This
now happens _after_ node_dev_init().

Therefore, calling register_cpu_under_node() from __register_one_node()
becomes a no-op, and can be removed.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/base/node.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/drivers/base/node.c b/drivers/base/node.c
index 493d533f8375..4d5ac7cf8757 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -867,7 +867,6 @@ void register_memory_blocks_under_node(int nid, unsigned long start_pfn,
 int __register_one_node(int nid)
 {
 	int error;
-	int cpu;
 
 	node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL);
 	if (!node_devices[nid])
@@ -875,12 +874,6 @@ int __register_one_node(int nid)
 
 	error = register_node(node_devices[nid], nid);
 
-	/* link cpu under this node */
-	for_each_present_cpu(cpu) {
-		if (cpu_to_node(cpu) == nid)
-			register_cpu_under_node(cpu, nid);
-	}
-
 	INIT_LIST_HEAD(&node_devices[nid]->access_list);
 	node_init_caches(nid);
 
-- 
2.30.2