linux-kernel - Re: [PATCH 1/2] PPC: powernv: remove redundant cpuidle_idle

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <52FDFB4C.7010607@linux.vnet.ibm.com>
Date:	Fri, 14 Feb 2014 16:47:32 +0530
From:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, linux-pm@...r.kernel.org,
	linaro-kernel@...ts.linaro.org,
	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/2] PPC: powernv: remove redundant cpuidle_idle_call()

Hi Nicolas,

You will have to include the below patch with yours. You
could squash the two I guess, I have added the changelog
just for clarity. And you also might want to change the subject to
cpuidle/powernv. It gives a better picture.

Thanks

Regards
Preeti U Murthy


cpuidle/powernv: Add ppc64_runlatch_off/on() to idle routines

Following moving of cpuidle_idle_call() to the generic idle loop, we need to
add the runlatch functions to the idle routines on powernv which was earlier
taken care of by the arch specific idle routine.

Signed-off-by: Preeti U Murthy <preeti@...ux.vnet.ibm.com>
---
 drivers/cpuidle/cpuidle-powernv.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
index 78fd174..f48607c 100644
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -14,6 +14,7 @@
 
 #include <asm/machdep.h>
 #include <asm/firmware.h>
+#include <asm/runlatch.h>
 
 struct cpuidle_driver powernv_idle_driver = {
 	.name             = "powernv_idle",
@@ -30,12 +31,14 @@ static int snooze_loop(struct cpuidle_device *dev,
 	local_irq_enable();
 	set_thread_flag(TIF_POLLING_NRFLAG);
 
+	ppc64_runlatch_off();
 	while (!need_resched()) {
 		HMT_low();
 		HMT_very_low();
 	}
 
 	HMT_medium();
+	ppc64_runlatch_on();
 	clear_thread_flag(TIF_POLLING_NRFLAG);
 	smp_mb();
 	return index;
@@ -45,7 +48,9 @@ static int nap_loop(struct cpuidle_device *dev,
 			struct cpuidle_driver *drv,
 			int index)
 {
+	ppc64_runlatch_off();
 	power7_idle();
+	ppc64_runlatch_on();
 	return index;
 }

 
On 02/06/2014 07:46 PM, Nicolas Pitre wrote:
> The core idle loop now takes care of it.
> 
> Signed-off-by: Nicolas Pitre <nico@...aro.org>
> ---
>  arch/powerpc/platforms/powernv/setup.c | 13 +------------
>  1 file changed, 1 insertion(+), 12 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
> index 21166f65c9..a932feb290 100644
> --- a/arch/powerpc/platforms/powernv/setup.c
> +++ b/arch/powerpc/platforms/powernv/setup.c
> @@ -26,7 +26,6 @@
>  #include <linux/of_fdt.h>
>  #include <linux/interrupt.h>
>  #include <linux/bug.h>
> -#include <linux/cpuidle.h>
> 
>  #include <asm/machdep.h>
>  #include <asm/firmware.h>
> @@ -217,16 +216,6 @@ static int __init pnv_probe(void)
>  	return 1;
>  }
> 
> -void powernv_idle(void)
> -{
> -	/* Hook to cpuidle framework if available, else
> -	 * call on default platform idle code
> -	 */
> -	if (cpuidle_idle_call()) {
> -		power7_idle();
> -	}
> -}
> -
>  define_machine(powernv) {
>  	.name			= "PowerNV",
>  	.probe			= pnv_probe,
> @@ -236,7 +225,7 @@ define_machine(powernv) {
>  	.show_cpuinfo		= pnv_show_cpuinfo,
>  	.progress		= pnv_progress,
>  	.machine_shutdown	= pnv_shutdown,
> -	.power_save             = powernv_idle,
> +	.power_save             = power7_idle,
>  	.calibrate_decr		= generic_calibrate_decr,
>  #ifdef CONFIG_KEXEC
>  	.kexec_cpu_down		= pnv_kexec_cpu_down,
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/