From patchwork Fri Jun 8 07:36:11 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [09/10] UBUNTU: (drop after v3.5-rc1) ARM: 7347/1: SCU: use cpu_logical_map for per-CPU low power mode Date: Thu, 07 Jun 2012 21:36:11 -0000 From: Ike Panhc X-Patchwork-Id: 163728 Message-Id: <1339140971-10477-1-git-send-email-ike.pan@canonical.com> To: kernel-team@lists.ubuntu.com From: Will Deacon BugLink: http://launchpad.net/bugs/1008345 scu_power_mode changes the power mode for the current CPU, which it determines from smp_processor_id(). However, this assumes that the physical CPU number is equal to Linux's logical CPU number and if this is not true, we will power off the wrong CPU. This patch uses cpu_logical_map to translate the logical CPU number into a physical one in scu_power_mode. Reported-by: Lorenzo Pieralisi Signed-off-by: Will Deacon Signed-off-by: Russell King (cherry picked from commit 0bd82adee38046fcf180a60ca56c181702287646) Signed-off-by: Ike Panhc --- arch/arm/kernel/smp_scu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm/kernel/smp_scu.c b/arch/arm/kernel/smp_scu.c index 8f5dd79..b9f015e 100644 --- a/arch/arm/kernel/smp_scu.c +++ b/arch/arm/kernel/smp_scu.c @@ -11,6 +11,7 @@ #include #include +#include #include #include #include @@ -74,7 +75,7 @@ void scu_enable(void __iomem *scu_base) int scu_power_mode(void __iomem *scu_base, unsigned int mode) { unsigned int val; - int cpu = smp_processor_id(); + int cpu = cpu_logical_map(smp_processor_id()); if (mode > 3 || mode == 1 || cpu > 3) return -EINVAL;