Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752330Ab3CHF4s (ORCPT ); Fri, 8 Mar 2013 00:56:48 -0500 Received: from mga03.intel.com ([143.182.124.21]:38884 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751738Ab3CHF4r (ORCPT ); Fri, 8 Mar 2013 00:56:47 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.84,806,1355126400"; d="scan'208";a="210947054" Subject: [PATCH 3/3] intel_idle: set the state_tables array as __initdata to save mem From: Chuansheng Liu To: lenb@kernel.org Cc: daniel.lezcano@linaro.org, len.brown@intel.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, chuansheng.liu@intel.com In-Reply-To: <1362754926.31506.42.camel@cliu38-desktop-build> References: <1362674529.31506.17.camel@cliu38-desktop-build> <1362754926.31506.42.camel@cliu38-desktop-build> Content-Type: text/plain; charset="UTF-8" Date: Fri, 08 Mar 2013 23:06:09 +0800 Message-ID: <1362755169.31506.47.camel@cliu38-desktop-build> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3932 Lines: 115 Currently, in intel_idle.c, there are 5 state_tables array, every array size is sizeof(struct cpuidle_state) * CPUIDLE_STATE_MAX. As in intel_idle_cpuidle_driver_init(), we have copied the data into intel_idle_driver->state[], so do not need to keep state_tables[] there any more after system init. It will save about 3~4k memory, also benefits mobile devices. Here changing them as __initdata, also removing global var cpuidle_state_table pointer. Signed-off-by: liu chuansheng --- drivers/idle/intel_idle.c | 18 ++++++++---------- 1 files changed, 8 insertions(+), 10 deletions(-) diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 503b401..cbdc952 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -99,8 +99,6 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index); static int intel_idle_cpu_init(int cpu); -static struct cpuidle_state *cpuidle_state_table; - /* * Set this flag for states where the HW flushes the TLB for us * and so we don't need cross-calls to keep it consistent. @@ -124,7 +122,7 @@ static struct cpuidle_state *cpuidle_state_table; * which is also the index into the MWAIT hint array. * Thus C0 is a dummy. */ -static struct cpuidle_state nehalem_cstates[CPUIDLE_STATE_MAX] = { +static struct cpuidle_state nehalem_cstates[CPUIDLE_STATE_MAX] __initdata = { { .name = "C1-NHM", .desc = "MWAIT 0x00", @@ -157,7 +155,7 @@ static struct cpuidle_state nehalem_cstates[CPUIDLE_STATE_MAX] = { .enter = NULL } }; -static struct cpuidle_state snb_cstates[CPUIDLE_STATE_MAX] = { +static struct cpuidle_state snb_cstates[CPUIDLE_STATE_MAX] __initdata = { { .name = "C1-SNB", .desc = "MWAIT 0x00", @@ -197,7 +195,7 @@ static struct cpuidle_state snb_cstates[CPUIDLE_STATE_MAX] = { .enter = NULL } }; -static struct cpuidle_state ivb_cstates[CPUIDLE_STATE_MAX] = { +static struct cpuidle_state ivb_cstates[CPUIDLE_STATE_MAX] __initdata = { { .name = "C1-IVB", .desc = "MWAIT 0x00", @@ -237,7 +235,7 @@ static struct cpuidle_state ivb_cstates[CPUIDLE_STATE_MAX] = { .enter = NULL } }; -static struct cpuidle_state hsw_cstates[CPUIDLE_STATE_MAX] = { +static struct cpuidle_state hsw_cstates[CPUIDLE_STATE_MAX] __initdata = { { .name = "C1-HSW", .desc = "MWAIT 0x00", @@ -277,7 +275,7 @@ static struct cpuidle_state hsw_cstates[CPUIDLE_STATE_MAX] = { .enter = NULL } }; -static struct cpuidle_state atom_cstates[CPUIDLE_STATE_MAX] = { +static struct cpuidle_state atom_cstates[CPUIDLE_STATE_MAX] __initdata = { { .name = "C1E-ATM", .desc = "MWAIT 0x00", @@ -472,7 +470,7 @@ MODULE_DEVICE_TABLE(x86cpu, intel_idle_ids); /* * intel_idle_probe() */ -static int intel_idle_probe(void) +static int __init intel_idle_probe(void) { unsigned int eax, ebx, ecx; const struct x86_cpu_id *id; @@ -504,7 +502,6 @@ static int intel_idle_probe(void) pr_debug(PREFIX "MWAIT substates: 0x%x\n", mwait_substates); icpu = (const struct idle_cpu *)id->driver_data; - cpuidle_state_table = icpu->state_table; if (boot_cpu_has(X86_FEATURE_ARAT)) /* Always Reliable APIC Timer */ lapic_timer_reliable_states = LAPIC_TIMER_ALWAYS_RELIABLE; @@ -540,10 +537,11 @@ static void intel_idle_cpuidle_devices_uninit(void) * intel_idle_cpuidle_driver_init() * allocate, initialize cpuidle_states */ -static int intel_idle_cpuidle_driver_init(void) +static int __init intel_idle_cpuidle_driver_init(void) { int cstate; struct cpuidle_driver *drv = &intel_idle_driver; + struct cpuidle_state *cpuidle_state_table = icpu->state_table; drv->state_count = 1; -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/