linux-kernel - Re: [PATCH] x86/UV: Fix conditional in gru

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Date:	Fri, 21 Mar 2014 11:13:42 -0500
From:	Dimitri Sivanich <sivanich@....com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] x86/UV: Fix conditional in gru_exit

On Fri, Mar 21, 2014 at 08:55:49AM +0100, Ingo Molnar wrote:
> > -	if (!is_uv_system())
> > +	if (!is_uv_system() || (is_uvx_hub() && !is_uv2_hub()))
> >  		return;
> 
> Such an amalgation of three system specific conditionals is 
> disgusting, please at minimum factor out a helper routine so that such 
> mismatches cannot happen.
>
Agreed.  Here's a new patch.


Fix supported system conditional in gru_exit.

Signed-off-by: Dimitri Sivanich <sivanich@....com>
---
 drivers/misc/sgi-gru/grufile.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Index: linux/drivers/misc/sgi-gru/grufile.c
===================================================================
--- linux.orig/drivers/misc/sgi-gru/grufile.c
+++ linux/drivers/misc/sgi-gru/grufile.c
@@ -58,6 +58,10 @@ static int max_user_cbrs, max_user_dsr_b
 
 static struct miscdevice gru_miscdev;
 
+static int gru_unsupported(void)
+{
+	return !is_uv_system() || (is_uvx_hub() && !is_uv2_hub());
+}
 
 /*
  * gru_vma_close
@@ -518,7 +522,7 @@ static int __init gru_init(void)
 {
 	int ret;
 
-	if (!is_uv_system() || (is_uvx_hub() && !is_uv2_hub()))
+	if (gru_unsupported())
 		return 0;
 
 #if defined CONFIG_IA64
@@ -573,7 +577,7 @@ exit0:
 
 static void __exit gru_exit(void)
 {
-	if (!is_uv_system())
+	if (gru_unsupported())
 		return;
 
 	gru_teardown_tlb_irqs();
--
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