From mboxrd@z Thu Jan 1 00:00:00 1970 From: johlstei@codeaurora.org (Jeff Ohlstein) Date: Thu, 7 Apr 2011 17:41:09 -0700 Subject: [PATCH] msm: platsmp: actually read core count in get_core_count Message-ID: <1302223269-32047-1-git-send-email-johlstei@codeaurora.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Previously we just assumed there were CONFIG_NR_CPUS cpus present in the system. Instead, figure out the number of cpus from the MIDR register. Signed-off-by: Jeff Ohlstein --- arch/arm/mach-msm/platsmp.c | 11 +++++++++-- 1 files changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/arm/mach-msm/platsmp.c b/arch/arm/mach-msm/platsmp.c index 0f427bc..58c1d7b 100644 --- a/arch/arm/mach-msm/platsmp.c +++ b/arch/arm/mach-msm/platsmp.c @@ -18,6 +18,7 @@ #include #include +#include #include #include @@ -40,6 +41,12 @@ volatile int pen_release = -1; static DEFINE_SPINLOCK(boot_lock); +static inline int get_core_count(void) +{ + /* 1 + the PART[1:0] field of MIDR */ + return ((read_cpuid_id() >> 4) & 3) + 1; +} + void __cpuinit platform_secondary_init(unsigned int cpu) { /* Configure edge-triggered PPIs */ @@ -147,9 +154,9 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle) */ void __init smp_init_cpus(void) { - unsigned int i; + unsigned int i, ncores = get_core_count(); - for (i = 0; i < NR_CPUS; i++) + for (i = 0; i < ncores; i++) set_cpu_possible(i, true); } -- Sent by an employee of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.