linux-kernel - Re: [RFC PATCH v1 12/70] x86, pci, amd_bus:

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Message-ID: <20140723180718.GH21707@pd.tnic>
Date:	Wed, 23 Jul 2014 20:07:18 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	"Chen, Gong" <gong.chen@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org, tglx@...utronix.de,
	paulus@...ba.org, benh@...nel.crashing.org, tony.luck@...el.com,
	hpa@...or.com, jkosina@...e.cz, rafael.j.wysocki@...el.com,
	linux@....linux.org.uk, ralf@...ux-mips.org,
	schwidefsky@...ibm.com, davem@...emloft.net,
	viro@...iv.linux.org.uk, fweisbec@...il.com, cl@...ux.com,
	akpm@...ux-foundation.org, axboe@...nel.dk,
	JBottomley@...allels.com, neilb@...e.de,
	christoffer.dall@...aro.org, rostedt@...dmis.org, rric@...nel.org,
	gregkh@...uxfoundation.org, mhocko@...e.cz, david@...morbit.com
Subject: Re: [RFC PATCH v1 12/70] x86, pci, amd_bus: _FROZEN Cleanup

On Tue, Jul 22, 2014 at 09:58:48PM -0400, Chen, Gong wrote:
> Remove XXX_FROZEN state from x86/pci/amd_bus.
> 
> Signed-off-by: Chen, Gong <gong.chen@...ux.intel.com>
> ---
>  arch/x86/pci/amd_bus.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/x86/pci/amd_bus.c b/arch/x86/pci/amd_bus.c
> index c20d2cc..30f0fca9 100644
> --- a/arch/x86/pci/amd_bus.c
> +++ b/arch/x86/pci/amd_bus.c
> @@ -341,9 +341,8 @@ static int amd_cpu_notify(struct notifier_block *self, unsigned long action,
>  			  void *hcpu)
>  {
>  	int cpu = (long)hcpu;
> -	switch (action) {
> +	switch (action & ~CPU_TASKS_FROZEN) {
>  	case CPU_ONLINE:
> -	case CPU_ONLINE_FROZEN:
>  		smp_call_function_single(cpu, enable_pci_io_ecs, NULL, 0);
>  		break;
>  	default:

Or you can kill all the switch-case gunk and make it even more readable:

Index: b/arch/x86/pci/amd_bus.c
===================================================================
--- a/arch/x86/pci/amd_bus.c	2014-07-23 20:04:44.074436425 +0200
+++ b/arch/x86/pci/amd_bus.c	2014-07-23 20:05:14.282436087 +0200
@@ -340,15 +340,9 @@ static void enable_pci_io_ecs(void *unus
 static int amd_cpu_notify(struct notifier_block *self, unsigned long action,
 			  void *hcpu)
 {
-	int cpu = (long)hcpu;
-	switch (action) {
-	case CPU_ONLINE:
-	case CPU_ONLINE_FROZEN:
-		smp_call_function_single(cpu, enable_pci_io_ecs, NULL, 0);
-		break;
-	default:
-		break;
-	}
+	if ((action & ~CPU_TASKS_FROZEN) == CPU_ONLINE)
+		smp_call_function_single((long)hcpu, enable_pci_io_ecs, NULL, 0);
+
 	return NOTIFY_OK;
 }

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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