From mboxrd@z Thu Jan 1 00:00:00 1970 From: dave.martin@linaro.org (Dave Martin) Date: Fri, 8 Feb 2013 12:19:40 +0000 Subject: [PATCH] ARM: Allow modules to read cpu_logical_map Message-ID: <1360325980-19089-1-git-send-email-dave.martin@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org It is reasonable for loadable modules to be CPU topology aware (particular examples include cpufreq and cpuidle drivers). This patch exports a new function cpu_get_hwid(cpu) to provide suitable read-only access outside vmlinux. Signed-off-by: Dave Martin --- Modules using this function will be arch-dependent and highly coupled to the kernel, so cpu_get_hwid() shouldn't be considered a stable API, especially while the details of kernel topology awareness are still under discussion: therefore, export only to GPL code for now. arch/arm/include/asm/smp_plat.h | 3 +++ arch/arm/kernel/setup.c | 7 +++++++ 2 files changed, 10 insertions(+), 0 deletions(-) diff --git a/arch/arm/include/asm/smp_plat.h b/arch/arm/include/asm/smp_plat.h index aaa61b6..518e466 100644 --- a/arch/arm/include/asm/smp_plat.h +++ b/arch/arm/include/asm/smp_plat.h @@ -66,4 +66,7 @@ static inline int get_logical_index(u32 mpidr) return -EINVAL; } +/* Read-only accessor for use by modules: */ +int cpu_get_hwid(int cpu); + #endif diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 3f6cbb2..1ac5e8b 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -429,6 +429,13 @@ void cpu_init(void) int __cpu_logical_map[NR_CPUS]; +/* Read-only accessor for use by modules: */ +int cpu_get_hwid(int cpu) +{ + return cpu_logical_map(cpu); +} +EXPORT_SYMBOL_GPL(cpu_get_hwid); + void __init smp_setup_processor_id(void) { int i; -- 1.7.4.1