linux-kernel - [PATCH v3 03/24] arm64: Delay cpuinfo_store_boot

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Date:	Tue, 13 Oct 2015 18:22:11 +0100
From:	"Suzuki K. Poulose" <suzuki.poulose@....com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	catalin.marinas@....com, will.deacon@....com, mark.rutland@....com,
	dave.martin@....com, Vladimir.Murzin@....com,
	steve.capper@...aro.org, linux-kernel@...r.kernel.org,
	ard.biesheuvel@...aro.org, james.morse@....com,
	marc.zyngier@....com, christoffer.dall@...aro.org,
	andre.przywara@....com, edward.nevill@...aro.org, aph@...hat.com,
	ryan.arnold@...aro.org,
	"Suzuki K. Poulose" <suzuki.poulose@....com>
Subject: [PATCH v3 03/24] arm64: Delay cpuinfo_store_boot_cpu

At the moment the boot CPU stores the cpuinfo much 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@....com>
---
 arch/arm64/kernel/setup.c |   10 ++--------
 arch/arm64/kernel/smp.c   |    1 +
 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index d149c18..c217992 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -285,13 +285,6 @@ 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);
@@ -403,8 +396,9 @@ 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 cb3e0d8..3b22e65 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -333,6 +333,7 @@ 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()));
 }
 
-- 
1.7.9.5

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