linux-kernel - [PATCH v4 2/7] arm64: cpu: Add accessor for boot_cpu

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Date:   Thu, 22 Aug 2019 15:42:15 +0100
From:   Raphael Gault <raphael.gault@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     mingo@...hat.com, peterz@...radead.org, catalin.marinas@....com,
        will.deacon@....com, acme@...nel.org, mark.rutland@....com,
        raph.gault+kdev@...il.com, Raphael Gault <raphael.gault@....com>
Subject: [PATCH v4 2/7] arm64: cpu: Add accessor for boot_cpu_data

Mark boot_cpu_data as read-only after initialization.
Define accessor to read boot_cpu_data from outside of boot_cpu_data.

Signed-off-by: Raphael Gault <raphael.gault@....com>
---
 arch/arm64/include/asm/cpu.h | 2 +-
 arch/arm64/kernel/cpuinfo.c  | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h
index d72d995b7e25..6abc2faf1a64 100644
--- a/arch/arm64/include/asm/cpu.h
+++ b/arch/arm64/include/asm/cpu.h
@@ -62,5 +62,5 @@ void __init cpuinfo_store_boot_cpu(void);
 void __init init_cpu_features(struct cpuinfo_arm64 *info);
 void update_cpu_features(int cpu, struct cpuinfo_arm64 *info,
 				 struct cpuinfo_arm64 *boot);
-
+struct cpuinfo_arm64 *get_boot_cpu_data(void);
 #endif /* __ASM_CPU_H */
diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index 876055e37352..ffa00b3a148b 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -31,7 +31,7 @@
  * values depending on configuration at or after reset.
  */
 DEFINE_PER_CPU(struct cpuinfo_arm64, cpu_data);
-static struct cpuinfo_arm64 boot_cpu_data;
+static struct cpuinfo_arm64 boot_cpu_data __ro_after_init;
 
 static char *icache_policy_str[] = {
 	[0 ... ICACHE_POLICY_PIPT]	= "RESERVED/UNKNOWN",
@@ -395,4 +395,9 @@ void __init cpuinfo_store_boot_cpu(void)
 	init_cpu_features(&boot_cpu_data);
 }
 
+struct cpuinfo_arm64 *get_boot_cpu_data(void)
+{
+	return &boot_cpu_data;
+}
+
 device_initcall(cpuinfo_regs_init);
-- 
2.17.1