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

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Message-ID: <20140331152320.GA31495@sgi.com>
Date:	Mon, 31 Mar 2014 10:23:20 -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 Mon, Mar 31, 2014 at 09:25:05AM +0200, Ingo Molnar wrote:
> * Dimitri Sivanich <sivanich@....com> wrote:
> 
> > +static int gru_unsupported(void)
> > +{
> > +	return !is_uv_system() || (is_uvx_hub() && !is_uv2_hub());
> > +}
> 
> So the usual pattern is to introduce simple patterns, without logic 
> operations in their name. I.e. "gru_supported()" would be more natural 
> than "gru_not_supported()" or gru_unsupported()".
>

OK.  Here's a revised version.



Fix supported system conditional in gru_exit.

Signed-off-by: Dimitri Sivanich <sivanich@....com>
---
 drivers/misc/sgi-gru/grufile.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

Index: linux/drivers/misc/sgi-gru/grufile.c
===================================================================
--- linux.orig/drivers/misc/sgi-gru/grufile.c
+++ linux/drivers/misc/sgi-gru/grufile.c
@@ -6,7 +6,7 @@
  * This file supports the user system call for file open, close, mmap, etc.
  * This also incudes the driver initialization code.
  *
- *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
+ *  Copyright (c) 2008-2014 Silicon Graphics, Inc.  All Rights Reserved.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -58,6 +58,11 @@ static int max_user_cbrs, max_user_dsr_b
 
 static struct miscdevice gru_miscdev;
 
+static int gru_supported(void)
+{
+	return is_uv_system() &&
+		(uv_hub_info->hub_revision < UV3_HUB_REVISION_BASE);
+}
 
 /*
  * gru_vma_close
@@ -518,7 +523,7 @@ static int __init gru_init(void)
 {
 	int ret;
 
-	if (!is_uv_system() || (is_uvx_hub() && !is_uv2_hub()))
+	if (!gru_supported())
 		return 0;
 
 #if defined CONFIG_IA64
@@ -573,7 +578,7 @@ exit0:
 
 static void __exit gru_exit(void)
 {
-	if (!is_uv_system())
+	if (!gru_supported())
 		return;
 
 	gru_teardown_tlb_irqs();
--
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