[PATCH 1/2] ARM: always store CPU ID early into percpu data
From: Russell King <hidden>
Date: 2016-11-14 12:57:41
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Always store the CPU ID into the percpu data so that it is available early on. This allows us to eliminate various is_smp() tests that select between reading the hardware CPU ID directly and reading from the percpu data. Signed-off-by: Russell King <redacted> --- arch/arm/include/asm/smp_plat.h | 5 +---- arch/arm/kernel/setup.c | 5 ++++- 2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/arm/include/asm/smp_plat.h b/arch/arm/include/asm/smp_plat.h
index f9080717fc88..43f246b73ce7 100644
--- a/arch/arm/include/asm/smp_plat.h
+++ b/arch/arm/include/asm/smp_plat.h@@ -34,10 +34,7 @@ static inline bool is_smp(void) */ static inline unsigned int smp_cpuid_part(int cpu) { - struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpu); - - return is_smp() ? cpu_info->cpuid & ARM_CPU_PART_MASK : - read_cpuid_part(); + return per_cpu(cpu_data, cpu).cpuid; } /* all SMP configurations have the extended CPUID registers */
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 34e3f3c45634..80f45b01fbaa 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c@@ -724,6 +724,9 @@ static void __init setup_processor(void) cacheid_init(); cpu_init(); + + /* Always setup the boot CPU ID in the per-cpu data */ + per_cpu(cpu_data, smp_processor_id()).cpuid = read_cpuid_id(); } void __init dump_machine_table(void)
@@ -1217,7 +1220,7 @@ static int c_show(struct seq_file *m, void *v) * "processor". Give glibc what it expects. */ seq_printf(m, "processor\t: %d\n", i); - cpuid = is_smp() ? per_cpu(cpu_data, i).cpuid : read_cpuid_id(); + cpuid = per_cpu(cpu_data, i).cpuid; seq_printf(m, "model name\t: %s rev %d (%s)\n", cpu_name, cpuid & 15, elf_platform);
--
2.7.4