linux-kernel - [PATCH 02/12] ARM: Use of_get_cpu

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Date:   Wed,  6 Oct 2021 11:43:22 -0500
From:   Rob Herring <robh@...nel.org>
To:     Russell King <linux@...linux.org.uk>,
        James Morse <james.morse@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Stafford Horne <shorne@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, x86@...nel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-csky@...r.kernel.org, openrisc@...ts.librecores.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-sh@...r.kernel.org, devicetree@...r.kernel.org
Subject: [PATCH 02/12] ARM: Use of_get_cpu_hwid()

Replace the open coded parsing of CPU nodes' 'reg' property with
of_get_cpu_hwid().

This change drops an error message for missing 'reg' property, but that
should not be necessary as the DT tools will ensure 'reg' is present.

Cc: Russell King <linux@...linux.org.uk>
Signed-off-by: Rob Herring <robh@...nel.org>
---
 arch/arm/kernel/devtree.c | 22 ++--------------------
 1 file changed, 2 insertions(+), 20 deletions(-)

diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c
index 28311dd0fee6..02839d8b6202 100644
--- a/arch/arm/kernel/devtree.c
+++ b/arch/arm/kernel/devtree.c
@@ -84,33 +84,15 @@ void __init arm_dt_init_cpu_maps(void)
 		return;
 
 	for_each_of_cpu_node(cpu) {
-		const __be32 *cell;
-		int prop_bytes;
-		u32 hwid;
+		u32 hwid = of_get_cpu_hwid(cpu, 0);
 
 		pr_debug(" * %pOF...\n", cpu);
-		/*
-		 * A device tree containing CPU nodes with missing "reg"
-		 * properties is considered invalid to build the
-		 * cpu_logical_map.
-		 */
-		cell = of_get_property(cpu, "reg", &prop_bytes);
-		if (!cell || prop_bytes < sizeof(*cell)) {
-			pr_debug(" * %pOF missing reg property\n", cpu);
-			of_node_put(cpu);
-			return;
-		}
 
 		/*
 		 * Bits n:24 must be set to 0 in the DT since the reg property
 		 * defines the MPIDR[23:0].
 		 */
-		do {
-			hwid = be32_to_cpu(*cell++);
-			prop_bytes -= sizeof(*cell);
-		} while (!hwid && prop_bytes > 0);
-
-		if (prop_bytes || (hwid & ~MPIDR_HWID_BITMASK)) {
+		if (hwid & ~MPIDR_HWID_BITMASK) {
 			of_node_put(cpu);
 			return;
 		}
-- 
2.30.2