From: Suzuki K. Poulose <suzuki.poulose@arm.com>
Date: Mon, 19 Oct 2015 13:24:40 +0000 (+0100)
Subject: arm64: Delay cpuinfo_store_boot_cpu
X-Git-Tag: firefly_0821_release~176^2~703^2~42
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4b998ff1885eecd3dc330bf057e24667c1db84a4;p=firefly-linux-kernel-4.4.55.git

arm64: Delay cpuinfo_store_boot_cpu

At the moment the boot CPU stores the cpuinfo long before the
PERCPU areas are initialised by the kernel. This could be problematic
as the non-boot CPU data structures might get copied with the data
from the boot CPU, giving us no chance to detect if a particular CPU
updated its cpuinfo. This patch delays the boot cpu store to
smp_prepare_boot_cpu().

Also kills the setup_processor() which no longer does meaningful
work.

Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Tested-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 4f0408e1df0d..47e005141598 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -286,13 +286,6 @@ void __init setup_cpu_features(void)
 #endif
 }
 
-static void __init setup_processor(void)
-{
-	pr_info("Boot CPU: AArch64 Processor [%08x]\n", read_cpuid_id());
-	sprintf(init_utsname()->machine, ELF_PLATFORM);
-	cpuinfo_store_boot_cpu();
-}
-
 static void __init setup_machine_fdt(phys_addr_t dt_phys)
 {
 	void *dt_virt = fixmap_remap_fdt(dt_phys);
@@ -404,8 +397,9 @@ u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
 
 void __init setup_arch(char **cmdline_p)
 {
-	setup_processor();
+	pr_info("Boot CPU: AArch64 Processor [%08x]\n", read_cpuid_id());
 
+	sprintf(init_utsname()->machine, ELF_PLATFORM);
 	init_mm.start_code = (unsigned long) _text;
 	init_mm.end_code   = (unsigned long) _etext;
 	init_mm.end_data   = (unsigned long) _edata;
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 77763d9cb510..d1d00499f0cf 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -327,6 +327,7 @@ void __init smp_cpus_done(unsigned int max_cpus)
 
 void __init smp_prepare_boot_cpu(void)
 {
+	cpuinfo_store_boot_cpu();
 	set_my_cpu_offset(per_cpu_offset(smp_processor_id()));
 }